Amplifier with input drift voltage compensation
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United States of America Patent
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-
Dec 9, 1986
Grant Date -
N/A
app pub date -
Apr 30, 1985
filing date -
May 4, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention concerns an amplifier comprising means for compensating for the input drift voltage. During a preparation phase, the input signal of the amplifier (10) is nullified by short-circuiting the inputs (12) and (13) by means of the change-over switch (30) and the output (15) is connected to a capacitor (40) and to a secondary input (14) of the amplifier. The secondary input has a substantially lower gain than the gain relative to the main input (13), which makes it possible substantially to reduce the effect of charge injection caused by opening of the switch (60). In the amplification phase, the input (13) receives an input signal (V1) and the input drift voltage (.alpha.V) is compensated by means of the value stored in the capacitor (40).
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