Barely Doherty et using et VCC modulation for bias control
AssigneeQorvo US, Inc.
InventorNadim Khlat
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Abstract
A power amplifier system is disclosed with a carrier amplifier having a carrier bias input and a carrier supply node and a peaking amplifier having a peaking bias input and a peaking supply node. Also included is an envelope tracking power supply having a modulated voltage supply output coupled to the peaking supply node. Further included is a peaking bias controller having a peaking bias control input coupled to the peaking supply node and a peaking bias control output coupled to the peaking bias input, wherein the peaking bias controller is configured to generate in response to a modulated peaking supply voltage generated by the envelope tracking power supply at the peaking supply node a modulated peaking bias signal that controls bias of the peaking amplifier.
Claims21
A power amplifier system comprising:
- a carrier amplifier having a carrier bias input and a carrier supply node;
- a peaking amplifier having a peaking bias input and a peaking supply node;
- an envelope tracking power supply having a modulated voltage supply output coupled to the peaking supply node;
- a peaking bias controller having a peaking bias control input coupled to the peaking supply node and a peaking bias control output coupled to the peaking bias input, wherein the peaking bias controller generates in response to a modulated peaking supply voltage generated by the envelope tracking power supply at the peaking supply node a modulated peaking bias signal that controls bias of the peaking amplifier;
- a peaking direct current (DC) bias controller coupled to the peaking bias input, wherein the peaking DC bias controller is configured to adjust DC bias of the peaking amplifier as a function of average output power of the peaking amplifier;
- and
- a carrier bias controller coupled between the modulated voltage supply output and the carrier bias input, wherein the carrier bias controller is configured to adjust DC bias of the carrier amplifier as a function of average output power of the carrier amplifier.
Dependencies are inferred from the claim text.