Patent ID: 6985039

Claim:
A method for stabilizing the output power of a power amplifier, operated with signals having a large peak-to-average ratio and fed by a DC power supply having fluctuating output voltage, said power amplifier having a first DC supply path for constantly providing DC power to said power amplifier and a second supply path for providing enhancement supply voltage to said power amplifier, to be exploited during the peak period of said signals, comprising: a) determining an allowable fluctuating range for the voltage that is output from said DC power supply, varying between an upper limit (U) and a lower limit (L); b) determining a constant voltage level (B max ) being equal or greater than said upper limit (U); c) providing a controllable voltage enhancement circuitry being capable of outputting an enhancement voltage generated from said fluctuating output voltage, said enhancement voltage varying between a first non-negative value (B max −U) being the difference between said constant voltage level and said upper limit, and a second positive value (B max −L) being the difference between said constant voltage level and said lower limit, according to the control input of said voltage enhancement circuitry; d) connecting the input of said voltage enhancement circuitry and said first DC supply path to the output of said DC power supply; e) connecting the output of said voltage enhancement circuitry to said second DC supply path; f) continuously sampling the instantaneous magnitude of said fluctuating output voltage and said enhancement voltage; and g) as long as the instantaneous value of said fluctuating output voltage is lower than said constant voltage level (B max ), causing said voltage enhancement circuitry to generate an enhancement voltage that causes the sum of the voltages supplied through said first and second supply paths, to be identical to said constant voltage level (B max ).