| 摘要 |
<p>A circuit (10) for measuring a parameter to be sensed by means of at least one variable impedance sensor (CV) responsive to such parameter. The circuit (10) includes a frequency determining means (12) coupled to the variable sensor (CV) for providing an oscillatory frequency signal responsive to the impedance of the sensor (CV), a signal amplifier coupled to the frequency determining means (12) for amplifying the frequency signal to provide an output signal representative of the frequency signal and to sustain circuit oscillation, a signal detector (70) coupled to the output signal to provide a control signal representative of such output signal, and a control (90) coupled to receive the control signal and coupled to the frequency determining means (12) thus allowing the oscillatory frequency signal of the circuit (10) to oscillate at a frequency representative of the measured parameter.</p> |
