Abstract: The invention is a linear converter that operates from a single, unregulated power supply to provide voltage gain and power amplification. The circuit comprises two pulse-width modulators, two switches, and an inductive element, all of which cooperate to maintain an output voltage in fixed proportion to an input signal. According to the invention, an error signal is generated in a resistive divider formed between the input voltage and the output voltage. Excursions of this error signal from two fixed voltage references are used by the pulse-width modulators to generate two pulse-width modulated signals. One pulse-width modulated signal is generated when the error signal is below one voltage reference, and it drives a switch to inductively increase the output voltage. The other pulse-width modulated signal is generated when the error signal is above another voltage reference, and it drives another switch to inductively decrease the output voltage.

Abstract: A high efficiency power amplifier system receives an unregulated voltage signal and an input signal V.sub.in, and conditions the unregulated voltage signal to provide a regulated output signal whose magnitude depends on the value of the input signal V.sub.in. The system includes a control circuit which detects changes in the input signal V.sub.in and the regulated output signal, and provides a feedback signal to a variable output switching regulator, which controls the regulated output signal value to maintain a predetermined relationship between the input signal V.sub.in and the regulated output signal. Significantly, controlling the regulated output signal such that it maintains the predetermined relationship with the input signal V.sub.in allows the power amplifier system to provide the regulated voltage signal directly to the electrical load. The control circuit monitors V.sub.