|Abstract: ||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.