Multi-band power amplifier

摘要

Disclosed is a multi-band power amplifier capable of operating at multiple frequency bands. The multi-band power amplifier includes: a power amplification unit which amplifies an input signal; a matching network circuit which provides impedance matching between the power amplification unit and a load; and an auxiliary amplification unit which additionally supplies a certain magnitude of electric current to the load.

主权项

1. A multi-band power amplifier comprising:
a power amplification unit which amplifies an input signal; a matching network circuit which provides impedance matching between the power amplification unit and a load; an auxiliary amplification unit which additionally supplies a certain magnitude of electric current to the load; a transmission line which changes the magnitude and phase of electric current output from the auxiliary amplification unit, while maintaining impedances seen from the power amplification unit towards the load are the same at a first frequency and at a second frequency; and a switch which interrupts the electric current additionally supplied to the load, set to an OFF state and an ON state in accordance with a current condition, said switch directly connected between the transmission line and an output of the power amplification unit; wherein the electric current output from the auxiliary amplification unit is set according to a bias circuit of the auxiliary amplification unit.