| 摘要 |
In a radio selection call receiver, a high frequency amplifier amplifies a received signal from an antenna to produce an amplified signal. A filter eliminates an undesired wave form the amplified signal to produce a filtered signal. A frequency converter converts a frequency of the filtered signal to produce a converted signal. A demodulator demodulates the converted signal to produce a demodulated baseband signal. A control circuit compares a call number signal from the demodulated baseband signal with the predetermined call number signal to produce a coincidence signal when the call number signal coincides with the predetermined call number signal. The frequency converter comprises a power supply voltage switching circuit for switching one of power supply voltages to another of the power supply voltages when the power supply voltage switching circuit is supplied with a control signal and a bias switching circuit for switching one of direct current voltages to another of the direct current voltages when the bias switching circuit is supplied with the control signal. The control circuit generates the control signal when the call number signal does not coincide with the predetermined call number signal.
|
