Bandwidth-enhanced Feed-forward Amplifier with Shared Class-AB Gain and Compensation Paths
- Resource Type
- Conference
- Authors
- Anupam, Mayank; Rathore, Harshit; Mondal, Imon
- Source
- 2022 IEEE International Symposium on Circuits and Systems (ISCAS) Circuits and Systems (ISCAS), 2022 IEEE International Symposium on. :2943-2947 May, 2022
- Subject
- Components, Circuits, Devices and Systems
Power, Energy and Industry Applications
Robotics and Control Systems
Signal Processing and Analysis
Operational amplifiers
Baseband
Circuits and systems
Receivers
Capacitance
Boosting
Gain
- Language
- ISSN
- 2158-1525
An analysis of the inherent trade-offs of the existing feed-forward architectures for wideband applications is presented. A current-reused, class-AB, feed-forward compensated operational amplifier (opamp) capable of driving large capacitive loads is proposed. The architecture is based on sharing a single output stage between the gain and the compensation paths using AC-coupling between them, while retaining the inherent class-AB operation of the output stage. The bandwidth of the opamp is enhanced by boosting the transconductance of the compensation path using a pre-amplifier. The opamp is shown to support a load capacitance of 10 pF while maintaining >40 dB baseband gain over a frequency range of 100 MHz while maintaining a phase-margin in excess of 60° in a standard 65 nm bulk-CMOS technology.