Circuit and method of canceling leakage current in an analog arr

Details Circuit and method of canceling leakage current in an analog arr Circuit and method of canceling leakage current in an analog arr

1994-09-06

1996-02-20

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Gating

Signal transmission integrity or spurious noise override

327307, 327 52, 327 65, 327378, H03K 1716

Patent

active

054932467

ABSTRACT:
A field programmable analog array cell (10) uses programmable impedance blocks (12, 18, 22, 24) in the feed-forward and feed-back paths of an amplifier (14) to set the overall function of the array. The impedance blocks use switches (34, 38, 42, 46) to program the desired impedance value. The switches induce leakage currents into the amplifier inputs which cause drift in the output voltage. A compensation circuit (28) providing a compensation current of opposite polarity to the leakage current to the same amplifier input to cancel its effects. Alternately, a compensation circuit (30) provides a compensation current having the same polarity as the leakage current to the opposite amplifier input to cancel its effects. A p-channel transistor (50) and n-channel transistor (54) are sized to one-half the total diffusion area of like semiconductor devices in the switching circuits.

REFERENCES:
patent: 4163947 (1979-08-01), Weedon
patent: 4216394 (1980-08-01), Leidich
patent: 4555668 (1985-11-01), Gregorian et al.
patent: 4885548 (1989-12-01), Wakimoto et al.
patent: 4988900 (1991-01-01), Fensch

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