Amplifiers – With periodic switching input-output
Patent
1998-10-27
2000-11-14
Shingleton, Michael B
Amplifiers
With periodic switching input-output
327164, 327307, 331 78, H03F 102, H03B 2900
Patent
active
061475521
ABSTRACT:
An improved chopper stabilized operational amplifier is disclosed, along with an improved method of timing the switchings of chopper switches in such an amplifier. The disclosure includes an integrated circuit and method for generating a true random voltage signal having a truly random RMS voltage value within a selected range. The true random voltage signal is obtained by amplifying and bandpass filtering random white noise voltages generated by a component of the circuit. The white noise voltages include shot noise voltages generated by bipolar transistors in an input amplifier stage. The random signal generator circuit and method is employed with an oscillator to form a random clock signal generator on the integrated circuit chip. The amount of time between each clocking pulse output by the random clock signal generator truly randomly varies within a selected range of time, and repeats only by random chance. The random clock signal generator is used to control the amount of time between each switching of a chopper switch in a chopper-stabilized operational amplifier, so that the chopping frequency is truly random. The truly random variation of the chopper switching frequency reduces interference due to aliasing of noise typically created by such switches.
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National Semiconductor Corporation
Parsons James E.
Shingleton Michael B
Steuber David E.
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