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Supply-noise-rejecting current source

United States Patent

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February 18, 2020
View the Complete Patent at the US Patent & Trademark Office
Various technologies pertaining to a high-impedance current source are described herein. The current source outputs a substantially constant current by way of a first transistor that draws current from a supply. The current source is configured to feed-back noise from the supply to a feedback resistor at an input of an operational amplifier (op-amp) by way of a second transistor. The feedback resistor and the op-amp are configured such that responsive to receiving the supply noise feedback, the op-amp drives a gate voltage of the first transistor to cause the first transistor to reject the supply noise and cause the output of the current source to remain substantially constant.
16/ 016,818
June 25, 2018
H03F 1/30 (20060101)G05F 3/26 (20060101)H03F 3/45 (20060101)G05F 1/46 (20060101)H03F 3/345 (20060101)
STATEMENT OF GOVERNMENTAL INTEREST This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention.