Patent ID: 6147552
Filing Date: 2000-11-14
Classification: H03B,H03F

Abstract:
A chopper-stabilized operational amplifier implemented on a single integrated circuit chip comprising:an operational amplifier on said chip;a chopper-stabilizer circuit on said chip auxiliary to the operational amplifier, wherein the chopper-stabilizer circuit includes a chopper switch that oscillates between a first state and a second state, with a first amount of time between each oscillation; anda clock signal generator circuit on said chip, wherein the clock signal generator circuit includes a first component that generates white noise voltages upon application of a DC bias current, and the clock signal generator circuit outputs a first voltage signal derived from the white noise voltages; andwherein the first voltage signal is provided directly or indirectly to the chopper stabilizer circuit, and the first amount of time between oscillations of the chopper switch varies randomly within a selected range based at least in part on the first voltage signal.