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Floating_input_bridge

2016-05-19 09:41  
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Floating_input_bridge
Figure 4-8 shows an optically coupled switched-capacitor bridge with a floating input. The common-mode rejection ratio at dc for the front-end exceeds 160 dB. The amplifier operates over a ±200-V common-mode range. Gain-accuracy and stability are limited only by external resistors. The offset drift is 0.05-μV/℃. The optical drive to the MOSFET eliminates the charge-injection problems that are common to FET switched-capacitor networks. LINEAR TECHNOLOGY, APPLICATION NOTE 43, P, 10.