Xu Xinnan

Bio: Xu Xinnan is an academic researcher. The author has contributed to research in topics: Open-loop gain & Operational amplifier. The author has an hindex of 1, co-authored 1 publications receiving 1 citations.

Switched-capacitor multiply-by-two amplifier with reduced capacitor mismatches sensitivity and full swing sample signal common-mode voltage

Abstract: A switched-capacitor amplifier with an accurate gain of two that is insensitive to component mismatch is proposed. This structure is based on associating two sets of two capacitors in cross series during the amplification phase. This circuit permits the common-mode voltage of the sample signal to reach full swing. Using the charge-complement technique, the proposed amplifier can reduce the impact of parasitic capacitors on the gain accuracy effectively. Simulation results show that as sample signal common-mode voltage changes, the difference between the minimum and maximum gain error is less than 0.03%. When the capacitor mismatch is increased from 0 to 0.2%, the gain error is deteriorated by 0.00015%. In all simulations, the gain of amplifier is 69 dB.

Multiply-by-n Switched Capacitor Amplifier Insensitive to Capacitance Mismatch

Abstract: Precision multiply-by-2 amplifiers have been researched intensively due to their use in pipelined analog-to-digital converters. For integer gains greater than 2, not much work has been reported. This work presents a multiply-by-n switched capacitor amplifier, for n greater than 2, whose gain is insensitive to capacitor mismatch. Simulation results show that the variation in gain due to capacitance mismatch is much lesser than conventional architectures.