Patent ID: 7593702

Claim:
A method, comprising: determining a desired RF output power and obtaining a battery voltage value from a battery; determining a supply control voltage and a bias control voltage and a highest power efficiency from said desired RF output power and said battery voltage value; transmitting selected values of said supply control voltage and said bias control voltage to supply control circuitry and bias control circuitry; and wherein said supply control circuitry comprises: an operational amplifier having a positive input, a negative input and an output, capable of receiving said supply control voltage via said negative input, a ground resistor having a first terminal operatively coupled to said positive input of said operational amplifier and having a second terminal operatively coupled to a ground, a collector resistor having first and second terminals, wherein said first terminal of said collector resistor is operatively coupled to said first terminal of said ground resistor and to said positive input of said operational amplifier, and a transistor having a source, a gate and a drain, wherein said source is operatively coupled to said battery and capable of receiving said battery voltage from said battery, and wherein said gate is operatively coupled to said output of said operational amplifier, and wherein said drain is operatively coupled to a power amplifier and said second terminal of said collector resistor and capable of transmitting said supply collector voltage.