Importance

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Abstract

An apparatus for controlling the output power of a transmitter installed in a vehicle or used in a mobile radio communication equipment and more particularly to apparatus and method for accurately measuring and controlling over a wide range the output power of a radio frequency to be transmitted. The apparatus has a voltage level adjusting unit for amplifying a voltage of a radio frequency signal to be transmitted in correspondence with a difference between output power set data and measuring output power data to adjust a voltage level of the radio frequency signal to be transmitted; a power amplifying unit for amplifying an output signal delivered from the voltage level adjusting unit; a coupler for sensing a power level outputted from the power amplifying unit; an attenuator for controlling the power level sensed by the coupler in response to an attenuation ratio control signal applied; a high power level measuring unit for generating address data indicating that the radio frequency signal to be transmitted is in a high power level and generating the attenuation ratio control signal indicative of the amount of attenuation thereto, in the case that a maximum value of a power level outputted from the attenuator is larger than a set value; a radio frequency amplifying unit for amplifying the power outputted from the attenuator in response to an amplification ratio control signal.

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First Claim