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该论文提出了一种采用乒乓自动调零和斩波技术的电流反馈仪表放大器，以降低失调、1/f噪声和输出纹波，解决了在宽共模电压范围内实现高共模抑制比的问题。
A current-feedback instrumentation amplifier (CFIA) is presented that uses ping-pong auto-zeroing and chopping to reduce offset, 1/f noise, and output ripple. CFIAs are attractive because of their ability to sense differential input voltages in a common-mode voltage range (CMVR) that includes either of the supply rails [1]. They can thus interface directly, for instance, with ground-referenced sensors in a single-supply system. This property results from the fact that the input voltage is sensed by an open-loop input stage, which typically exploits the inherent level-shift provided by the input transistors’ threshold voltage to sense beyond the rail. The open-loop input stage, however, complicates the application of the dynamic offset cancellation techniques often required to reduce offset and 1/f noise. In order to obtain a ripple-free output signal, a combination of autozeroing (AZ) and chopping can be applied [2,3]. AZ cancels the offset and 1/f
Michiel A.P. Pertijs, Wilko J. Kindt
National Semiconductor, Delft, Netherlands