Adaptive power leveling of an RF transceiver utilizing information stored in non-volatile memory

Claim 1

In a radio frequency (RF) transceiver having a frequency synthesizer adapted to modulate a baseband information signal across a plurality of distinct channels and a power amplifier adapted to amplify said modulated signal to a desired power level for transmission as an RF signal, a power leveling apparatus comprises: a directional coupler coupled to said amplification stage to permit said amplified and modulated information signal to pass therethrough prior to RF transmission, said directional coupler being adapted to sample a portion of said amplified and modulated information signal; an envelope detector coupled to said directional coupler, said envelope detector receiving said portion of said amplified and modulated information signal and providing a corresponding DC signal therefrom; an analog-to-digital converter coupled to said envelope detector, said analog-to-digital converter converting said DC signal to sampled binary values; a non-volatile memory coupled to said frequency synthesizer, said non-volatile memory comprising a table of offset values having individual entries corresponding to each of said distinct channels, said non-volatile memory being adapted to receive said sampled binary values from said analog-to-digital converter and provide corresponding ones of said offset values for storage in said table; and a digital-to-analog converter coupled to said power amplifier, said digital-to-analog converter adapted to receive one of said stored offset values from said table for an associated one of said channels and convert said one of said offset values to a DC bias value used to control an amount of amplification provided by said power amplifier for said associated one of said channels.