Analog preamplifier calibration

Details Analog preamplifier calibration Analog preamplifier calibration

2007-09-11

2007-09-11

Choe, Henry (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S009000

Reexamination Certificate

active

11266861

ABSTRACT:
A combined analog and digital calibration circuit and method for adjusting an output offset voltage of a differential amplifier circuit are provided. The circuit comprises a digitally controlled voltage divider positioned between at least one isolated well and a controllable voltage source, a controllable voltage source controlled by an initial constant current and a variable current, and a controller to modify the variable current to continuously adjust the back gate control voltage. The method comprises adjusting a control voltage of at least one of a pair of input transistors using a back gate control voltage, providing an analog current to establish a back gate control voltage, and altering the analog current when the back gate control voltage causes an output offset voltage to differ from a reference voltage by more than a predetermined quantity.

REFERENCES:
patent: 6262625 (2001-07-01), Perner et al.
patent: 6586989 (2003-07-01), Perner et al.
patent: 6873209 (2005-03-01), Takata et al.

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