Circuit and method of canceling leakage current in an analog array
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United States of America Patent
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Feb 20, 1996
Grant Date -
N/A
app pub date -
Sep 6, 1994
filing date -
Sep 6, 1994
priority date (Note) -
Expired
status (Latency Note)
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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.
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