| 摘要 |
PURPOSE:To avoid an unestablished reference voltage in the case of retrieving a preamble signal by charging a reference voltage use capacitor continuously through a resistor with a lower resistance than the other case during the reception in the intermittent reception for the retrieval period of the preamble signal. CONSTITUTION:A capacitance of a capacitor C in a waveform shaping circuit 1 is increased and even when the establishment of a reference voltage of a comparator 1a by the capacitor C slows down, an electronic switch Sw of the waveform shaping circuit 1 keeps the 'ON' state till a preamble detection circuit 6 detects a preamble signal or till an intermittent reception timing generating circuit 8 does not send a battery saving control signal (e) and quick charging continues. Thus, the reference voltage is established during the reception in the intermittent reception for the retrieval of the preamble signal and undetection of the preamble signal is considerably avoided. Thus, the unestablishment of the reference voltage is avoided in the case of retrieving the preamble signal. |
