A band-tunable Auto-Zeroing Amplifier

摘要

In this paper we present a tunable Auto-Zeroing Amplifier(AZA). The amplifier is based on Pseudo Floating gate and in addition to gain, it offers frequency band adjustment. Both the low- and high-frequency cutoffs are controlled electronically using bias voltages, thus the amplifier can be used in design of various time continues filters. The peak gain of the AZA is 22dB dB at 100 MHz and has a bandwidth from. The AZA enjoys low component spread and compactness, containing only small size transistors and capacitors suited for integration. We will also show a second order section realized using the AZA. The simulations presented in this paper are valid for the 90nm CMOS transistor models from STM having a VDD equal to 1.2V and threshold voltage of 0.25V.