Automatic zero balance circuit
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United States of America Patent
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-
Nov 15, 1983
Grant Date -
N/A
app pub date -
Sep 14, 1981
filing date -
Sep 14, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An automatic zero balance circuit for nulling the initial offset signal received from a test transducer. A quadrature oscillator powers a carrier transducer with the phase reference signal. A summing circuit receives the return signal from the transducer and sums it with two other signals. The resultant summation signal is divided into two components, the phase reference component and the quadrature reference component which are fed back into the summing circuit as the two other signals. The component values nullify the return signal thereby cancelling the initial offset signal.
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