The document presents a detailed overview of inverting and non-inverting amplifiers, including their operational principles, mathematical modeling, and key properties. It highlights the differences between the two types, particularly in terms of phase shift and input impedance. Additionally, it discusses applications of operational amplifiers in medical instrumentation, emphasizing their role in portable medical devices.

1. Inverting amplifier (gain 100) and
Non-Inverting amplifier (gain 100)
Presentation by : 16BM02 (M.Mohsin Memon)
Student of Mehran UET, Jamshoro

2. Inverting Amplifiers:
Introduction
A basic op-amp circuit is one
that produces an 180 signal
phase shift, The inverting
amplifier is the op-amp
counterpart of common
emitter and common-source
amplifiers.

3. In Inverting Amplifier circuit the
operational amplifier is connected with
feedback to produce a closed loop
operation. When dealing with
operational amplifiers there are two
very important rules to remember about
inverting amplifiers, these are:
1 “No current flows into the input
terminal”
2“V1 always equals V2”.
However, in real world op-amp circuits
both of these rules are slightly broken.

4. Mathematical modelling of Inverting Amplifier:
Vin is give as
Vin = iinRin
Vout is given as;
Vout = iinRf
Voltage gain;
Av = Vout /Vin
Since Vin = iinRin and Vout = iinRf :
Av = iinRf / iinRin
And then
Av = Rf / Rin
(Rf)
(Rin)

5. Simulation for inverting amplifier (gain 100)

6. Non inverting amplifiers
Introduction:
Non inverting amplifiers have almost
same properties as that of inverting with
following two exceptions:
1. Has much higher input impedance
2. Doesn’t produce 1800 voltage phase
shift

7. There is a slight Change in schematic as
compared to that of inverting amplifiers as
shown in figure below
1 signal is applied to non inverting op-amp
input.
2 input resistor is returned o ground.

8. Mathematical modelling:
Input voltage is given as
Vin = iin Rin ……….. 1
Since the voltage across Rf is equal to the difference
between vin and vout and if =iin, we can state the
current through the resistor is found as
If = Vout – Vin /Rf
And
Vout = iinRf + Vin ……. 2
From the above equations 1 and 2 , we can establish
that
ACL = Rf / Rin + 1

11. Applications of operational amplifiers In
Medical Instrumentation
The zero-drift, rail-to-rail op amps enable a new generation of
portable medical devices. Packaged in 6-pin SC70 (single) and 8-pin
SC70 (dual) packages, the devices claim outstanding precision and
low-noise performance and very small solution size.
Medical examples that use such op amps are:
1. Pulse oximetry
2. E.C.G
3. E.E.G
4. Bio potential amplifiers

12. Thank you ,
Open for Q and A session 
16BM02
Muhamad Mohsin Memon