TRANSMISSION OUTPUT CONTROL CIRCUIT, AND WIRELESS DEVICE USING THE SAME

摘要

According to a transmitting output control circuit of the present invention, one end of coupling capacitor (24) and one end of main line (30) of directional coupler (28) are coupled with output terminal (29) of power amplifier (21). Switch (33) for coupling the other end of coupling capacitor (24) and one end of sub line (31) of directional coupler (28) with cathode of first diode (23) or second terminating resistor (35) is formed in power amplifying apparatus (20). Any one of coupling capacitor (24) and directional coupler (28) is coupled by switching switch (33). By using this structure, the stable transmitting power control circuit, which can be used in a wide dynamic range necessary for detecting a transmitting output signal level, can be provided.