Auto zero circuitry and associated method

Details Auto zero circuitry and associated method Auto zero circuitry and associated method

1996-07-30

1998-09-22

Cunningham, Terry

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327362, 327 78, 327 63, 330 9, 330261, H03F 102

Patent

active

058120050

ABSTRACT:
A circuit and associated method for determining the offset bias of a comparator by first shorting together the inputs of the comparator to apply the same voltage signal at each of the inputs of the comparator. The voltage signal at one of the inputs is then offset a select amount by applying varying selected resistances from a variable resistor to the comparator. The variable resistor is controlled by a programmable controller that is responsive to an input clock signal. At each selected amount of offset applied to the input, the output is monitored to determine if the output of the comparator has flipped, or changed state. When the output flips, the corresponding resistance setting is used to compensate for the corresponding offset bias of the comparator.

REFERENCES:
patent: 4591740 (1986-05-01), Anderson et al.
patent: 5045806 (1991-09-01), Yan
patent: 5061900 (1991-10-01), Vinn et al.
patent: 5124663 (1992-06-01), McEntarfer et al.
patent: 5323121 (1994-06-01), Butler
patent: 5512848 (1996-04-01), Yaklin
patent: 5550512 (1996-08-01), Fukahori
patent: 5600275 (1997-02-01), Garavan
patent: 5610557 (1997-03-01), Jett, Jr.

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