Dense offset calibration circuitry and method

Details Dense offset calibration circuitry and method Dense offset calibration circuitry and method

1993-04-09

1995-03-14

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327362, 327537, H03F 126

Patent

active

053979443

ABSTRACT:
An audio mixer circuit on an integrated circuit chip performs a calibration operation on power up which calibrates out most of the offset voltages of the operational amplifiers used in the mixer. The calibration logic includes a shared calibrate circuit which provides timing signals to each operational amplifier and its associated calibration circuitry. The calibration operation is performed by digitally controlling and changing the bias current into each of the operational amplifiers until the offset voltage is compensated. A class A flip-flop circuit is used in the digital counter of the calibration circuitry to drive a current digital-to-analog converter.

REFERENCES:
patent: 4140874 (1979-02-01), Thomas
patent: 4224533 (1980-09-01), Lai
patent: 4553046 (1985-11-01), Alzati et al.
patent: 4553052 (1985-11-01), Takahashi
patent: 4633098 (1986-12-01), Mahmud
patent: 4902921 (1990-02-01), Hiramoto et al.

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