The document discusses operational amplifiers (op-amps) and differential amplifiers. It provides details on the basic requirements and characteristics of op-amps such as high gain, differential inputs, and high input/low output impedance. It describes the typical internal structure of an op-amp including differential, gain, and output stages. Ideal op-amp assumptions and linear op-amp operation in inverting and non-inverting configurations are also covered. The document then discusses differential amplifiers, including their advantages and applications in analog circuits. It provides details on a proposed CMOS differential amplifier design and its high common-mode rejection ratio.
A simple N-channel MOSFET can be used as a diode, Switch and Active resistor. This presentation is a part of course of Analog CMOS Design, based on textbook of same title by Allen Holberg.
DIFFERENTIAL AMPLIFIER using MOSFET, Modes of operation,
The MOS differential pair with a common-mode input voltage ,Common mode rejection,gain, advantages and disadvantages.
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. Although FET is sometimes used when referring to MOSFET devices, other types of field-effect transistors also exist.
This document discusses the basics of pass transistor logic. It also discusses how to realize ta a boolean equation using PTL , advantages and limitations of pass transistor circuits
Presentation on Op-amp by Sourabh kumarSourabh Kumar
Visit Andro Root ( http:\\www.androroot.com ) for Tech. news and Smartphones.
Presentation on Op-amp(Operational Amplifier) by Sourabh kumar. B.tech Presentation,
A simple N-channel MOSFET can be used as a diode, Switch and Active resistor. This presentation is a part of course of Analog CMOS Design, based on textbook of same title by Allen Holberg.
DIFFERENTIAL AMPLIFIER using MOSFET, Modes of operation,
The MOS differential pair with a common-mode input voltage ,Common mode rejection,gain, advantages and disadvantages.
The metal–oxide–semiconductor field-effect transistor (MOSFET, MOS-FET, or MOS FET) is a type of field-effect transistor (FET). It has an insulated gate, whose voltage determines the conductivity of the device. This ability to change conductivity with the amount of applied voltage can be used for amplifying or switching electronic signals. Although FET is sometimes used when referring to MOSFET devices, other types of field-effect transistors also exist.
This document discusses the basics of pass transistor logic. It also discusses how to realize ta a boolean equation using PTL , advantages and limitations of pass transistor circuits
Presentation on Op-amp by Sourabh kumarSourabh Kumar
Visit Andro Root ( http:\\www.androroot.com ) for Tech. news and Smartphones.
Presentation on Op-amp(Operational Amplifier) by Sourabh kumar. B.tech Presentation,
A dipole antenna is the simplest antenna but its radiation characteristics are very good. The main drawback of a dipole antenna is very narrow bandwidth. The analysis of a dipole antenna can be performed with integration of Hertzian dipoles.
Field Effect Transistor, JFET, Metal Oxide Semiconductor Field Effect Transistor, Depletion MOSFET, Enhancement MoSFET, Construction, Basic operation, Regions of Operation, Drain Characteristics, Transfer Characteristics, Biasing, Non-Ideal Characteristics of E-MOSFET, DC Analysis, AC equivalent circuit and Parameters, E-MOSFET as an Amplifier, AC analysis, MOSFET as a Switch, MOSFET as a diode, MOSFET as a resistor, High frequency equivalent circuit, Miller Capacitance, Frequency Response, NMOS and CMOS inverter
Field-effect transistor amplifiers provide an excellent voltage gain with the added feature of high input impedance. They are also low-power-consumption configurations with good frequency range and minimal size and weight.
JFETs, depletion MOSFETs, and MESFETs can be used to design amplifiers having similar voltage gains.
The depletion MOSFET (MESFET) circuit, however, has a much higher input impedance than a similar JFET configuration.
Designed a differential input and single ended output high gain (>= 85 dB) operational amplifier using CMOS 0.35um technology using a single independent current source. The amplifier was also designed to achieve a CMRR (>= 80dB), Average Slew Rate (>= 15 V/us), UGF (>= 15 MHz) & Output Voltage Swing ( >= 1.4V). The maximum power dissipation through the complete circuit including the current source branch was limited to 0.3 mW.
Frequency-independent (FI) antennas are radiating structures capable of maintaining consistent impedance and pattern characteristics over multiple-decade bandwidths. Their finite size limits the lowest frequency of operation, and the finite precision of the center region bounds the highest frequency of operation.
I have prepared it to create an understanding of delay modeling in VLSI.
Regards,
Vishal Sharma
Doctoral Research Scholar,
IIT Indore
vishalfzd@gmail.com
A dipole antenna is the simplest antenna but its radiation characteristics are very good. The main drawback of a dipole antenna is very narrow bandwidth. The analysis of a dipole antenna can be performed with integration of Hertzian dipoles.
Field Effect Transistor, JFET, Metal Oxide Semiconductor Field Effect Transistor, Depletion MOSFET, Enhancement MoSFET, Construction, Basic operation, Regions of Operation, Drain Characteristics, Transfer Characteristics, Biasing, Non-Ideal Characteristics of E-MOSFET, DC Analysis, AC equivalent circuit and Parameters, E-MOSFET as an Amplifier, AC analysis, MOSFET as a Switch, MOSFET as a diode, MOSFET as a resistor, High frequency equivalent circuit, Miller Capacitance, Frequency Response, NMOS and CMOS inverter
Field-effect transistor amplifiers provide an excellent voltage gain with the added feature of high input impedance. They are also low-power-consumption configurations with good frequency range and minimal size and weight.
JFETs, depletion MOSFETs, and MESFETs can be used to design amplifiers having similar voltage gains.
The depletion MOSFET (MESFET) circuit, however, has a much higher input impedance than a similar JFET configuration.
Designed a differential input and single ended output high gain (>= 85 dB) operational amplifier using CMOS 0.35um technology using a single independent current source. The amplifier was also designed to achieve a CMRR (>= 80dB), Average Slew Rate (>= 15 V/us), UGF (>= 15 MHz) & Output Voltage Swing ( >= 1.4V). The maximum power dissipation through the complete circuit including the current source branch was limited to 0.3 mW.
Frequency-independent (FI) antennas are radiating structures capable of maintaining consistent impedance and pattern characteristics over multiple-decade bandwidths. Their finite size limits the lowest frequency of operation, and the finite precision of the center region bounds the highest frequency of operation.
I have prepared it to create an understanding of delay modeling in VLSI.
Regards,
Vishal Sharma
Doctoral Research Scholar,
IIT Indore
vishalfzd@gmail.com
Introduction to operational Amplifier. For A2 level physics (CIE). Discusses characteristics of op amp, inverting and non inverting amplifier, and voltage follower, and transfer characetristics, virtual earth , etc
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
What will you get from this session?
1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
Speaker:
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
State of ICS and IoT Cyber Threat Landscape Report 2024 previewPrayukth K V
The IoT and OT threat landscape report has been prepared by the Threat Research Team at Sectrio using data from Sectrio, cyber threat intelligence farming facilities spread across over 85 cities around the world. In addition, Sectrio also runs AI-based advanced threat and payload engagement facilities that serve as sinks to attract and engage sophisticated threat actors, and newer malware including new variants and latent threats that are at an earlier stage of development.
The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
State of global ICS asset and network exposure
Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
LF Energy Webinar: Electrical Grid Modelling and Simulation Through PowSyBl -...DanBrown980551
Do you want to learn how to model and simulate an electrical network from scratch in under an hour?
Then welcome to this PowSyBl workshop, hosted by Rte, the French Transmission System Operator (TSO)!
During the webinar, you will discover the PowSyBl ecosystem as well as handle and study an electrical network through an interactive Python notebook.
PowSyBl is an open source project hosted by LF Energy, which offers a comprehensive set of features for electrical grid modelling and simulation. Among other advanced features, PowSyBl provides:
- A fully editable and extendable library for grid component modelling;
- Visualization tools to display your network;
- Grid simulation tools, such as power flows, security analyses (with or without remedial actions) and sensitivity analyses;
The framework is mostly written in Java, with a Python binding so that Python developers can access PowSyBl functionalities as well.
What you will learn during the webinar:
- For beginners: discover PowSyBl's functionalities through a quick general presentation and the notebook, without needing any expert coding skills;
- For advanced developers: master the skills to efficiently apply PowSyBl functionalities to your real-world scenarios.
Neuro-symbolic is not enough, we need neuro-*semantic*Frank van Harmelen
Neuro-symbolic (NeSy) AI is on the rise. However, simply machine learning on just any symbolic structure is not sufficient to really harvest the gains of NeSy. These will only be gained when the symbolic structures have an actual semantics. I give an operational definition of semantics as “predictable inference”.
All of this illustrated with link prediction over knowledge graphs, but the argument is general.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
2. What is an Op Amp?
• The op amp (operational amplifier) is a high gain, dc coupled amplifier
designed to
• be used with negative feedback to precisely define a closed loop transfer
function.
• The basic requirements for an op amp:
• Sufficiently large gain (the accuracy of the signal processing determines
this)
Differential inputs
• Frequency characteristics that permit stable operation when negative
feedback is
applied
Other requirements:
• High input impedance
• Low output impedance
• High speed/frequency
3. Operational Amplifiers
• An operational amplifier (called op-amp) is a specially-designed amplifier in
bipolar or CMOS (or BiCMOS) with the following typical characteristics:
– Very high gain (10,000 to 1,000,000)
– Differential input
– Very high (assumed infinite) input impedance
– Single ended output
– Very low output impedance
– Linear behavior (within the range of VNEG < vout < VPOS
• Op-amps are used as generic “black box” building blocks in much analog
electronic design
– Amplification
– Analog filtering
– Buffering
– Threshold detection
4. Generic View of Op-amp Internal Structure
• An op-amp is usually comprised of at least three different amplifier stages (see figure)
– Differential amplifier input stage with gain a1(v+ - v-) having inverting & non-inverting inputs
– Stage 2 is a “Gain” stage with gain a2 and differential or singled ended input and output
– Output stage is an emitter follower (or source follower) stage with a gain = ~1 and single-
ended output with a large current driving capability
• Simple Op-Amp Model (lower right figure):
– Two supplies VPOS and VNEG are utilized and always assumed (even if not explicitly shown)
– An input resistance rin (very high)
– An output resistance rout (very low) in series with output voltage source vo
– Linear Transfer function is vo = a1 a2(v+ - v-) = Ao(v+ - v-) where Ao is open-loop gain
– vo is clamped at VPOS or VNEG if Ao (v+ - v-) > VPOS or < VNEG, respectively
5. Ideal Op-amp Approximation
• Because of the extremely high voltage gain, high input
resistance, and low output resistance of an op-amp, we
use the following ideal assumptions:
– The saturation limits of v0 are equal VPOS & VNEG
– If (v+ - v-) is slightly positive, v0 saturates at VPOS;
if (v+ - v-) is slightly negative, v0 saturates at VNEG
– If v0 is not forced into saturation, then (v+ - v-)
must be very near zero and the op-amp is in its
linear region (which is usually the case for
negative feedback use)
– The input resistance can be considered infinite
allowing the assumption of zero input currents
– The output resistance can be considered to be
zero, which allows vout to equal the internal
voltage v0
• The idealized circuit model of an op-amp is shown at
the left-bottom figure
• The transfer characteristic is shown at the left-top
• Op-amps are typically used in negative feedback
configurations, where some portion of the output is
6. Linear Op-amp Operation: Non-Inverting Use
• An op-amp can use negative feedback to set the
closed-loop gain as a function of the circuit external
elements (resistors), independent of the op-amp gain,
as long as the internal op-amp gain is very high
• Shown at left is an ideal op-amp in a non-inverting
configuration with negative feedback provided by
voltage divider R1, R2
• Determination of closed-loop gain:
– Since the input current is assumed zero, we can
write v- = R1/(R1 + R2)vOUT
– But, since v+ =~ v- for the opamp operation in its
linear region, we can write
v- = vIN = R1/(R1 + R2)vOUT
or, vOUT = ((R1 + R2)/R1)vIN
• We can derive the same expression by writing
vOUT = A(v+- v-) = A{vIN – [R1/(R1 + R2)] vOUT}
and solving for vOUT with A>>1
Look at Example 2.1 and plot transfer curve.
7. The Concept of the Virtual Short
• The op-amp with negative feedback forces the two inputs v+ and v- to have the
same voltage, even though no current flows into either input.
– This is sometimes called a “virtual short”
– As long as the op-amp stays in its linear region, the output will change up or
down until v- is almost equal to v+
– If vIN is raised, vOUT will increase just enough so that v- (tapped from the
voltage divider) increases to be equal to v+ (= vIN)
• In vIN is lowered, vOUT lowers just enough to make v- = v+
– The negative feedback forces the “virtual short” condition to occur
• Look at Exercise 2.4 and 2.5
• For consideration:
– What would the op-amp do if the feedback connection were connected to
the v+ input and vIN were connected to the v- input?
• Hint: This connection is a positive feedback connection!
8. Linear Op-amp Operation: Inverting Configuration
• An op-amp in the inverting configuration (with
negative feedback) is shown at the left
– Feedback is from vOUT to v- through resistor R2
– vIN comes in to the v- terminal via resistor R1
– v+ is connected to ground
• Since v- = v+ = 0 and the input current is zero, we can
write
– i1 = (vIN – 0)/R1 = i2 = (0 – vOUT)/R2 or,
vOUT = - (R2/R1) vIN
• The circuit can be thought of as a resistor divider with
a virtual short (as shown below)
– If the input vIN rises, the output vOUT will fall just
enough to hold v- at the potential of v+ (=0)
– If the input vIN drops, vOUT will rise just enough
to force v- to be very near 0
• Look at Example 2.2 and Exercises 2.7-2.10
9. Input Resistance for Inverting and Non-inverting Op-amps
• The non-inverting op-amp configuration of slide 2-4 has an apparent input
resistance of infinity, since iIN = 0 and RIN = vIN/iIN = vIN/0 = infinity
• The inverting op-amp configuration, however, has an apparent input resistance
of R1
– since RIN = vIN/iIN = vIN/[(vIN – 0)/R1] = R1
10. Differential Amplifiers (Chapter 8 in Horenstein)
• Differential amplifiers are pervasive in analog electronics
– Low frequency amplifiers
– High frequency amplifiers
– Operational amplifiers – the first stage is a differential amplifier
– Analog modulators
– Logic gates
• Advantages
– Large input resistance
– High gain
– Differential input
– Good bias stability
– Excellent device parameter tracking in IC implementation
• Examples
– Bipolar 741 op-amp (mature, well-practiced, cheap)
– CMOS or BiCMOS op-amp designs (more recent, popular)
11. Generic CMOS Differential Amplifier
• A simple version of a CMOS differential
amplifier is shown at the left
– The load devices Q3 and Q4 are built
with PMOS transistors
– Q3 and Q4 operate as a form of current
mirror, in that the small signal current
in Q4 will be identical to the current in
Q3
– Q3 has an effective impedance looking
into its drain of 1/gm || ro3 since its
current will be a function of the voltage
on node vd1
– Q4 has an effective impedance looking
into its drain of ro4 only, since its
current will be constant and not a
function of vout
• The gain of the right hand (inverting) leg
will be higher than the gain of the left side
• Since all transistors have grounded source
operation, there is no body effect to worry
12. Introduction:
Current Mirrors made by using active devices have come to be
widely used in analog integrated circuits both as biasing elements
and as load devices for amplifier stages.
The current mirror uses the principle that if the gate-source
potentials of two identical MOS transistors are equal, then the
current flown through their Drain terminals should be the same.
14. An ideal current source/sink has infinite output impedance and,
subsequently, provides constant current over a wide operating voltage range.
the reality, however, is finite output impedance and limited output voltage
swing. also, for current mirrors, minimum input voltage requirements.if m1 and m2 are
perfectly matched, then the simple current mirror provides
if channel length modulation and mobility modulation are neglected, and SI
saturation operating is assumed. In addition, if VSS = 0V, then
Normally the values for VGS and L are selected and then W is used as a current scaling
factor. Typically VGS is chosen to provide VDS,sat of several hundred millivolts. Often
times the chosen L value is 2 to 5 times greater than the minimum Ldra to help
minimize the channel length modulation andmobility modulation effects.
15. The use of current mirrors in biasing can result in superior
insensitivity of circuit performance to variations in power supply
and temperature.
NMOS current mirrors are used as current sinks and PMOS
current mirrors are used as current sources.
There is variety of Current Mirror circuits available, each of them
having their own advantage and applications
17. The basic current mirror as shown in above figure.
Transistor M11 is operating in the saturation mode, and so is M12. In this setup,
the output current IOUT is directly related to IREF.
The drain current of a MOSFET ID is a function of both the gate-source
voltage and the drain-to-gate voltage of the MOSFET given by ID = f (VGS,
VDS).
18. Limitations:
Output resistance is finite and small value.
In basic current mirror circuit we can neglect the channel length
modulation.
POWER DISSIPATION: 116.39uW
20. In order to suppress the effect of channel length modulation, a
cascade current source can be used.
21. The idea of cascode structure is employed to increase the output
resistance and the implementation requires NMOS technology.
Advantages:
High gain
High bandwidth
High slew rate
High stability and high input impedance
22. Limitations:
The minimum allowable voltage equal to two overdrive voltages
plus one threshold voltage.
Thus the cascade mirror wastes one threshold voltage in the
headroom.
This is the drawback of Cascode current mirror
POWER DISSIPATION:68.3217uW
24. CONCLUSION
• Main intention of this paper is to present the simple idea of designing a new
CMOS Voltage Divider based Current Mirror, than its comparison with the
Basic and Cascode Current Mirrors. This new Mirror is well suited for low
current biasing applications. Like the Wilson and Widler current Mirror
Circuits, this new Current Mirror can be used as a Low Current Biasing
circuit. Also, when compared with Basic Current Mirror, improved one
consumes only 1/4th of the Power consumed by the Basic Current Mirror.
25. Modes of operation of Differential Amplifier
(DA)
• There are two modes of operations of DA
– Differential mode
– Common mode
• Differential mode:
• Two input signals are of same magnitude but
opposite polarity are used (1800 out of phase)
• Common mode
• Two input signals are of equal in magnitude and
same phase are used
26. INTRODUCTION
• These are widely used in the electronics industry.
• Differential amplifiers are used to amplify analog as well as
digital signals, and can be used in various implementations to
provide an output from the amplifier in response to differential
inputs.
• It is also very compatible with integrated circuit technology
and serves as the input stage to most of operational amplifier.
27. • The differential amplifier is often a building block or sub-
circuit used within high quality integrated circuit amplifiers,
linear and nonlinear signal processing circuits, and even
certain logic gates and digital interfacing circuits.
• CMOS differential amplifiers are used for various applications
because a number of advantages can be derived from these
types of amplifiers, as compared to single ended amplifiers.
28. • A fully differential amplifier circuit is a special type of
amplifier that has two inputs and two outputs.
• This device amplifies input signals on the two input lines that
are out of phase and rejects input signals that have a common
phase such as induced noise.
• The sensitivity is an important specification.
• The extra output differential voltage limits the minimum
detectable differential voltage level.
29. Basic Differential Amplifier
• The objective of the differential amplifier is to amplify only
the difference between two different potentials regardless of
common mode value.
• It is characterized by its CMRR and its offset voltage.
• In real differential amplifier, the output offset voltage is the
difference between the actual output voltage and the ideal
output voltage when the input terminals are connected
together.
31. • The differential amplifier is to amplify only the difference
between two different potentials regardless of common mode
value.
• It is characterized by its CMRR and its offset voltage. In ideal
differential amplifier, the common mode gain should be zero and
thus CMRR should be infinite, also the input offset voltage
should be zero.
• In real differential amplifier, the output offset voltage is the
difference between the actual output voltage and the ideal output
voltage when the input terminals are connected together.
32. Proposed differential amplifier
• The CMRR of the proposed differential amplifier is extremely
high.
• M3 and M7 forms the input stage and M2 and M1 are for the
output stage M4and M6 are used for current sink.
• In order to analysis the common mode gate of M7 and M3 is
shorted and then step input is applied for simulation.