Capacitively-Coupled Chopper Amplifiers by Qinwen Fan Kofi A. A. Makinwa & Johan H. Huijsing

Author:Qinwen Fan, Kofi A. A. Makinwa & Johan H. Huijsing
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

5.3.3 Experimental Results

The CCOPA was implemented in a HV 0.7 µm CMOS process (Fig. 5.11). It consumes 10 µA from a 5 V supply. Histograms of the residual ripple and the residual offset (at f chop = 25 kHz) are shown in Fig. 5.12. Typical PSRR and CMRR are higher than 114 and 140 dB, respectively. Its CMVR (−0.6 to 20 V) is not limited by CHin and C in, but rather by the ESD protection diodes of the pads used. Its noise spectrum is shown in Fig. 5.13 with a 1/f noise corner at around 0.5 Hz.

Fig. 5.11Chip micrograph

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