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本文提出了一种斩波稳定的多路径电流反馈仪表放大器（CFIA），通过连续时间纹波降低环路（RRL）消除斩波引起的纹波，实现了2µV的偏移和21nV/√Hz的噪声密度。该设计解决了传统斩波放大器需要额外滤波或自动调零的问题。
Amplifiers with low offset and low 1/f noise usually employ auto-zeroing (AZ) and/or chopping. However, AZ suffers from noise aliasing, and so requires more power dissipation for a given noise specification. Chopping, although free of noise aliasing, requires notch filters [1, 2] or AZ [3] to remove the ripple caused by up-modulated offset and 1/f noise. This paper describes a chopper-stabilized multi-path current-feedback instrumentation amplifier (CFIA), whose ripple is removed by a continuous-time (CT) ripple-reduction loop (RRL) [2]. In contrast to [2], the notch created by the RRL is eliminated by the use of a multi-path architecture. This results in a CFIA with a smooth single-pole response, which also achieves low offset (2µV) and low noise (21nV/√Hz) in a power efficient manner (NEF=9.6). By appropriately connecting its inputs, the CFIA can also be used as an opamp. In this configuration, its offset is further reduced while its
Qinwen Fan, Johan H. Huijsing, Kofi A.A. Makinwa
Delft University of Technology, Delft, Netherlands