Amplifiers – With periodic switching input-output
Patent
1989-02-17
1990-06-12
Mottola, Steven
Amplifiers
With periodic switching input-output
330 51, H03F 102, H03F 114
Patent
active
049336428
ABSTRACT:
A CMOS chopper-stabilized operational amplifier including a nulling amplifier and a main amplifier has a pair of two input differential amplifiers in the input stage of each of the nulling amplifier and the main amplifier. In the nulling amplifier, one two-input differential amplifier switchably receives the input signals to the chopper stabilized operational amplifier, while the other two input differential amplifier functions in a feedback loop for developing a nulling voltage for the DC offset of the first two input differential amplifier. The operational amplifier has a three-phase clock and samples through a nulling time period, a setting time period, and a sampling time period.
REFERENCES:
patent: 3988689 (1976-10-01), Ochi et al.
patent: 4622521 (1986-11-01), Redfern
"A Versatile Building Block: The CMOS Differential Difference Amplifier," IEEE Jrnl of Solid-State Circuits, vol. SC22, No. 2, pp. 287 et seq.
ICL7650 Chopper Stabilized Operational Amplifier Specifications Intersil, Inc.
Application Considerations and Circuits for a New Chopper-Stabilized Op Amp (Appln. Note 9), Linear Technology Corp. Mar. 1985.
Linear Technology Corporation
Mottola Steven
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