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该论文提出了一种多路径斩波稳定电容耦合运算放大器，解决了传统电容耦合斩波放大器在斩波频率附近存在传输函数陷波以及纹波抑制环路导致建立时间过长的问题。通过引入多路径技术，实现了20V输入共模范围、3μV失调和更快的建立时间。
Capacitively coupled chopper amplifiers are capable of handling common-mode voltages outside their supply rails, while also achieving high power efficiency and low offset [1-3]. However, a significant drawback of such amplifiers is a transfer-function notch around the chopping frequency (fchop). This is because their input choppers demodulate signals near fchop to DC, where they are blocked by the input capacitors. This problem is exacerbated by the use of a ripple-reduction loop (RRL) to suppress chopper ripple, which also creates a notch at fchop, and, moreover, can take up to 1ms to settle. The net result is an amplifier with a transfer-function notch and a step response that is accompanied by a slowlydecaying burst of chopper ripple [1]. To solve these problems, a multi-path capacitively-coupled chopper-stabilized operational amplifier (MCCOPA) is proposed. Implemented in a HV CMOS 0.7μm technology, it has a smooth transfer
Qinwen Fan, Johan Huijsing, Kofi A.A. Makinwa
Delft University of Technology, Delft, The Netherlands