A current mirror with selectable filter poles provides a selected low pass
filtering function to a DC bias signal generated by the current mirror.
Coupled between a first MOSFET and second MOSFET of the current mirror, a
low pass filter with selectable filter poles comprises a plurality of
resistor-configured MOSFETs coupled to at least one capacitor-configured
MOSFET to provide one of a fast settle time and improved filtering for
the current mirror in one embodiment of the invention. A first
resistor-configured MOSFETs, biased by logic and bias circuitry, provides
a low frequency filter pole that provides an improved filtering for the
current mirror. A second resistor-configured MOSFET provides a high
frequency filter pole that provides a fast charge time to meet a settle
time requirement.