CIRCUIT AND METHOD FOR REDUCING INPUT LEAKAGE IN CHOPPED AMPLIFIER DURING OVERLOAD CONDITIONS

摘要

A chopper-stabilized amplifier (20A) includes an amplifier (3), an input chopper (2A) having a first input (4) receiving an input signal (VIN + ), an output (5) coupled to a first input of the amplifier, and a feedback resistor (9) coupled to an output (6) of the amplifier to couple a feedback signal (VFB + ) to a second input of the amplifier (3). The input chopper operates in response to a chopping clock (CHOP_CLK). If the amplifier (3) is unacceptably close to a saturation condition, the chopping clock (CHOP_CLK) is disabled to reduce input leakage current (ILEAKAGE) of the chopper-stabilized amplifier.