원문정보
초록
영어
This paper presents a high performance chopper-Stabilized Two-stage operational amplifier for biomedical applications. This Two-stage is designed for low noise, low power, high PSRR and high CMRR. The Miller compensation technique (Cc) is used with a nulling active resistance (Rz) implemented using Transmission gate (TG) transistors for stable operation in feedback mode. Chopper stabilization technique has been widely used in amplifiers for flicker (1/f) noise and offsets reduction purposes using the principles of modulation and demodulation. Thus, the functionality and performance of modulation and demodulation circuits determines the realization and attainment of chopper stabilization. The operational amplifier was manufactured in a SPECTRE using GPDK 90nm CMOS technology with threshold voltages of a 0.17 V and - 0.14 V achieve a low power 2.6uW, 13.5nV /Hz at 10Hz high CMRR up to 130dB and PSRR up to 70dB at 1V power supply.
목차
1. Introduction
2. ECG Data Acquisition System
3. ECG Amplifier Design
3.1. Current Mirrors
3.2. Active Resistors
4. Chopper Stabilization Structure
4.1. Modulation and Demodulation Circuit
5. Simulation and Discussion
5.1. Device Parameter
5.2. Frequency Response, Compensation
5.3. Common Mode Rejection Ratio CMRR
5.4. Noise
5.5. Chopper Circuit
6. Conclusion
References