| 摘要 |
PURPOSE: A circuit for sensing a sensor in use with a voltage amplifier is provided to delicately sense a sensor by changing output voltage according to input voltage with a voltage amplifier. CONSTITUTION: An input signal Vin(f) has a constant voltage and frequency by means of signals applied to a sensor from external. A variable resistor sensor varies a resistive value. A voltage amplifier is connected to the variable resistor sensor to amplify voltage of the input signal. The voltage amplifier includes an operational amplifier, and a converted terminal is connected to a ground, and a non-converted terminal is connected to the variable resistor sensor. Between the input and output terminals of the voltage amplifier is connected a capacitor. Even weak change in a resistive value of the variable register sensor is increased by greatly changing a practical blocking frequency to improve a sensor sensibility.
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