Current-feedback instrumentation amplifiers
AssigneeMaxim Integrated Products, Inc.
InventorsJohan Hendrik Huijsing, Rong Wu, Kofi A. A. Makinwa
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Abstract
Current-feedback instrumentation amplifiers that include dynamic element matching for the input transconductance amplifiers by periodically swapping the transconductance amplifiers between the instrumentation amplifier input and the feedback input. The instrumentation amplifiers may include a gain error reduction loop, which loop corrects differences in the gains of the input transconductance amplifiers and eliminates the ripple in the instrumentation amplifier output caused by the dynamic element matching. If chopper stabilization is used, the amplifiers may also include an offset reduction loop. Various embodiments are disclosed.
Claims27
A current feedback instrumentation amplifier (CFIA) having a differential signal input, a differential feedback input and an output comprising:
- first and second transconductance amplifiers, each having a differential input and a differential output;
- the first and second transconductance amplifiers having their differential outputs coupled together and to the output of the CFIA;
- first circuitry coupled to the differential signal input and the differential feedback input to periodically swap the differential inputs of the first and second transconductance amplifiers between the differential signal input and the differential feedback input, respectively, at a first frequency.
Dependencies are inferred from the claim text.