Differential amplifier circuit having offset cancellation and method therefor
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United States of America Patent
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Apr 25, 1995
Grant Date -
N/A
app pub date -
Feb 14, 1994
filing date -
Feb 14, 1994
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a circuit (10) and method for sampling a single-ended signal and then converting the single-ended signal to a differential signal. After the single-ended signal is converted to a differential signal, then the offset voltage and low frequency noise of an operational amplifier (38) are subtracted from the differential signal using analog techniques. The subtraction operation effectively removes an operational amplifier's offset voltage and a low frequency noise from being a source of error in the differential output signal of the circuit.
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