US 2004/0056733 A1 · Self-tuned matching network for high efficient power amplifiers

Abstract

A passive interface circuit for coupling an output signal from a power amplifier to a load is disclosed. The interface presents an impedance to the power amplifier that increases as the power level in the output signal decreases. In one embodiment, the interface circuit includes a fixed network and a capacitor having a capacitance that varies with the potential across the capacitor. The fixed network couples the output signal to the load. The capacitor is connected in parallel with the load and has a capacitance that increases in response to an increase in potential across the capacitor. The capacitor is preferably a MEM capacitor having plates that move with respect to one another in response to changes in the average potential difference between the plates.

Claims10

Dependent claims

An interface circuit for coupling an input signal to a load, said circuit comprising:

a network having a fixed impedance for coupling said input signal to said load;
and
a capacitor connected in parallel with said load, said capacitor having a capacitance that increases in response to an increase in potential across said capacitor.

Dependencies are inferred from the claim text.

Self-tuned matching network for high efficient power amplifiers

Life of this patent

Self-tuned matching network for high efficient power amplifiers

Life of this patent

Abstract

Claims10