Amplifiers – With periodic switching input-output
Patent
1991-03-04
1992-06-23
Mullins, James B.
Amplifiers
With periodic switching input-output
330 51, 330253, 330295, H03F 102
Patent
active
051246635
ABSTRACT:
An amplifier circuit with internal offset cancellation receives a differential input signal and provides differentially related currents which flow through first and second conduction paths of a differential-to-signal-ended converter for providing an output signal. Although ideally the differentially related currents should be equal with a zero differential input signal, the inherent mismatches between the transistors of the amplifier produce error currents causing the offset error. During an auto-zero phase, the differential input signal is zeroed while first and second capacitors are connected to the first and second conduction paths of the differential-to-single-ended converter for storing a charge representative of the input offset voltage. During the operational phase, the capacitor voltages control first and second transistors operating in parallel with the first and second conduction path for removing any error current thereby providing compensation of the offset error for the differential input signal.
REFERENCES:
patent: 4190805 (1980-02-01), Bingham
patent: 4628274 (1986-12-01), Vittoz et al.
patent: 4808942 (1989-02-01), Milkovic
patent: 4884039 (1989-11-01), King et al.
patent: 4933643 (1990-06-01), Jandu et al.
McEntarfer Philip W.
Mijuskovic Dejan
Atkins Robert D.
Motorola Inc.
Mullins James B.
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