1. Design of High Gain Folded-Cascode
Operational Amplifier
presented by
Mounica.J
14204127

2. Contents:
 Introduction
 Ideal Op-Amp Characteiristics
 Performance Parameters
 Cascode op-amp
 Folded Cascode Technology
 Simulation Results
 Advantages
 Applications

3. Introduction
The design of op amps continues to pose a challenge as the
supply voltage and transistor channel length scale down
with each generation of CMOS technologies.
Operational amplifiers are the amplifier (controlled
sources) that has sufficiently high gain so that when
negative feedback is applied, the closed loop transfer
function is practically independent of the gain of the op
amp.

4. characteristics of Op-Amp:
Infinite Voltage Gain
Infinite Input Impedance
Zero Output Impedance
Infinite Bandwidth
Infinite CMMR
Infinite Slew Rate

5. performance parameters:
Gain
Small Signal Bandwidth
Large Signal Bandwidth
Output Swing
Linearity
Noise And Offset
Supply Rejection

6. CASCODE OP-AMP

7. FOLDED CASCODE OP-AMP

8. Folded Op-amp Technology:

12. simulation results

13. Comparision Between Cascode And Folded
Cascode Op-Amp Topologies:

14. Applications:
 Audio And Video Frequency Preamplifiers And Buffers
 Differential Amplifiers
 Differentiators And Integrators
 Filters
 Precision Rectifiers
 Voltage And Current Regulators
 Analog Calculators
 Analog To Digital Converters & Digital To Analog Converters

15. Advantages of folded cascade op-amp over cascade op-amp are as follows:
 It provides high gain
 Output voltage swing is high
 It will act as a unity gain buffer
 Output resistance is high
 It provides high ICMR
 It provides high PSSR