Patent ID: 6301486
Filing Date: 2001-10-09
Classification: H03G

Abstract:
A radio telephone apparatus including an antenna for receiving and transmitting a radio wave, a receiver, a transmitter, and a controller outputting a power-saving control signal to lower a transmitted output of said transmitter by a specified amount, said apparatus comprising:a modulator receiving, an input signal and outputting a modulated signal to be transmitted through said antenna;a voltage controlled variable attenuator, controlled by said power-saving control signal, receiving said modulated signal from said modulator and outputting an attenuated signal to be transmitted;an amplifier, controlled by said power-saving control signal, receiving said attenuated signal from said voltage controlled variable attenuator and outputting said attenuated signal directly without amplification to a transmission conductor when said power-saving, control signal is active but outputting said attenuated signal with amplification to said transmission conductor when said power-saving control signal is not active;a detector, controlled by said power-saving control signal, receiving said signal outputted from said amplifier and rectifying said signal to provide a detection voltage;a reference voltage generator, controlled by said power-saving a control signal, providing different reference voltages based upon whether said power-saving control signal is active or inactive; anda comparator comparing said reference voltage generator output with said detection voltage and providing an output signal to control said variable voltage controlled variable attenuator.