Patent ID: 7739522
Filing Date: 2010-06-15
Classification: H03F

Abstract:
1. An electronic power supply circuit, particularly suitable for supplying power to an ultra high or microwave radio frequency power amplifier with a high frequency varying power demand, said power supply circuit having a supply output arranged for connecting to an input of said ultra high or microwave radio frequency power amplifier, said power supply circuit comprising: a variable voltage supply circuit having a voltage output and a control input, said voltage supply circuit comprising a voltage divider series circuit of two controllable current limiting electronic linear devices connected across a voltage source input, each of said devices having a device control input in communication with said voltage supply control input via a control circuit, said linear devices and control circuit being arranged to operate at a control rate substantially corresponding to said high frequency, said control input being applied to said linear devices for controlling a voltage at a point of said series circuit located between said two linear devices, said point being connected to said supply output; and a switched mode type variable current supply of low electrical power dissipation connected to said supply output, wherein the switched mode type variable current supply is arranged to maximize an efficiency of the electronic power supply circuit, and to deliver a current appearing as a substantially constant current when plotted at a scale for observing a signal of a frequency corresponding to said ultra high or microwave radio frequency or at a scale for observing a signal of a frequency corresponding to said high frequency variation.