Circuit techniques for reducing the effects of op-amp imperfections: Autozeroing, correlated double sampling, and chopper stabilization
Circuit techniques for reducing the effects of op-amp imperfections: Autozeroing, correlated double sampling, and chopper stabilization
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DOI：
10.1109/5.542410
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发表时间：
1996-11-01
影响因子：
20.6
通讯作者：
Temes, GC
中科院分区：
文献类型：
--
作者：
Enz, CC;Temes, GC
在以低压CMOS技术制造的线性IC中，由于放大器的去偏移和低频噪声而导致的动态范围的减小变得越来越显著。此外，在这种技术中，可实现的放大器增益通常相当低，因为共源共栅可能不是实际的电路选项，这是由于输出信号摆幅的结果减小。在本文中，一些旧的和一些新的电路技术将被描述用于补偿放大器的最重要的非理想效应，包括噪声（主要是热噪声和1/f噪声），输入参考的去失调电压，以及有限的增益导致在输入端的非理想的虚拟接地。
In linear IC's fabricated in a low-voltage CMOS technology, the reduction of the dynamic range due to the de offset and low-frequency noise of the amplifiers becomes increasingly significant. Also, the achievable amplifier gain is often quite low in such a technology, since cascoding may not be a practical circuit option due to the resulting reduction of the output signal swing. In this paper, some old and some new circuit techniques will be described for the compensation of the amplifier most important nonideal effects including the noise (mainly thermal and 1/f noise), the input-referred de offset voltage, as well as the finite gain resulting in a nonideal virtual ground at the input.