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A 140dB-CMRR current-feedback instrumentation amplifier employing ping-pong auto-zeroing and choppingSolid-State Circuits Conference - Digest of Technical Papers, 2009. ISSCC 2009. IEEE International In Solid-State Circuits Conference - Digest of Technical Papers, 2009. ISSCC 2009. IEEE International (2009), pp. 324-325,325a.
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AbstractA 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.
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