Square wave excitation of a transducer

Details Square wave excitation of a transducer Square wave excitation of a transducer

G - Physics

01

L

G01L 1/22 (2006.01) G01G 3/147 (2006.01)

Patent

CA 2056053

A device far measuring a physical quantity includes a transducer and circuitry far exciting the transducer with an a.c. square wave. The excitation circuitry includes two amplifiers, a switch and a resistor network. The excitation circuitry provides a plus one gain when the switch is in one position and a minus one gain when the switch is in a second position. A similar circuit synchronously demodulates the transducer's output signal. Another similar circuit synchronously demodulates the transducer excitation signal and provides a reference voltage to an analog-to-digital converter (ADC). The ADC converts the demodulated transducer output signal into a binary word. Both demodulated signals are filtered before application to the ADC. An example of the device is a force-measuring device such as a weighing scale incorporating a strain gauge load cell.

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