Loop gain control for nonlinear current mirror

摘要

A nonlinear current mirror (100) for loop-gain control incorporates a resistor (90) in one section of a current mirror which produces a nonlinear transfer function for the current mirror. When the nonlinear current mirror is included as part of a capacitive displacement gauge the gain of the gauge varies as a function of the input to the current mirror which compensates for the change in gain caused by the probe capacitance. Accordingly, the distance range and/or frequency response of the capacitive displacement gauge is increased. IMAGE