Doherty amplifier

摘要

A Doherty amplifier has at least one peaking amplifier which has first and second drain connections, wherein the first drain connection is connected to the output network, and the other second drain connection is connection to the load. By providing two drain connections, separate package leads to the peaking amplifier can be taken into account when designing the impedance inverter and an output impedance. In this way, the circuit operation can be optimized both for the impedance inversion function and for driving the output load.

主权项

1. A Doherty amplifier for driving a load comprising:
a main amplifier package, comprising a main amplifier and a drain connection connecting a drain of the main amplifier to an output lead of the main amplifier package; a peaking amplifier package, comprising a peaking amplifier, a first drain connection connecting a drain of the peaking amplifier to a first output lead of the peaking amplifier package, and a second drain connection connecting the drain of the peaking amplifier to a second output lead of the peaking amplifier package different from the first output lead; an input network connecting an input of the Doherty amplifier to an input lead of the main amplifier package and to an input lead of the peaking amplifier package; and an output network connecting the output lead of the main amplifier package and the first output lead of the peaking amplifier package; wherein the output network, the drain capacitance of the main amplifier and the peaking amplifier, parasitics associated with the drain connection and output lead of the main amplifier package, and parasitics associated with the first drain connection and first output lead of the peaking amplifier package form an impedance inverter; and wherein, during operation, the second output lead is connected to the load.