Multiplication circuit for multiplying analog values
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United States of America Patent
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-
Jun 13, 1995
Grant Date -
N/A
app pub date -
Dec 23, 1993
filing date -
Dec 25, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A multiplication circuit for multiplying analog values. The multiplication circuit receives a plurality of input voltages and selects one of the input voltages. The multiplication circuit also includes at least one resistor/capacitor (RC) circuit. The RC circuits includes a resistor for receiving a stepwise start signal and a capacitor, which is connected between a ground potential and the resistor. An output terminal is connected between the resistor and the capacitor. The output terminal outputs an output voltage. The multiplication circuit produces a stop signal when a difference between the selected one of the input voltages and the output voltage is greater than a predetermined value. The multiplication circuit selectively increases or decreases a count value by a number of clock pulses that occur between the stepwise start signal and the stop signal, The multiplication circuit produces a count signal, which is indicative of the count value. The multiplication circuit includes a switch for electrically disconnecting, in accordance with the count signal, the resistor and the capacitor of the RC circuit.
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