| 摘要 |
A deviation control circuit in a wireless transducer according to a frequency change is disclosed. In the circuit, a microphone receives a baseband signal. A first amplifier amplifies the output signal from the microphone. A TCXO oscillates an optional oscillating frequency. A loop filter converts an applied signal to a DC power voltage. a VCO performs an oscillating operation by using a DC voltage from a loop filter. A PLL circuit compares the frequency from the VCO with a frequency generated by a TCXO and applies the comparison result signal to the loop filter. A gain control section amplifies and applies a baseband signal to the VCO which is applied to the first amplifier according to the DC voltage from the loop filter.
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