Low noise chopper stabilized amplifier and method of operation

Details Low noise chopper stabilized amplifier and method of operation Low noise chopper stabilized amplifier and method of operation

1988-12-22

1990-06-05

Mottola, Steven

Amplifiers

With periodic switching input-output

330 51, H03F 102, H03F 114

Patent

active

049317458

ABSTRACT:
A chopper op amp (10) is provided having an input chopping waveform (70). Input chopping waveform E (70) is used to generate waveform C (76) and waveform D (78) for activating switch C (36) and switch D (38), respectively. The high period of waveforms C (76) and D (78) are reduced relative to the chopping waveform (70), thereby corresponding to a reduced duty cycle for chopper op amp (10). The period (88, 90) of chopping waveform (70) may be reduced below two milliseconds.

REFERENCES:
patent: 4048574 (1977-09-01), Barbier et al.
patent: 4450368 (1984-05-01), Spence
Maxim Data Book, p. 7, published in 1986, ".+-.15 Volt Chopper Stabilized Operational Amplifier".
Linear Technology Data Book, p. 11, (published date unknown), "TC1052/LTC7652".
Intersil Data Book, p. 5-92, (published date unknown), "ICL7650".

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