Power amplifier system and associated bias circuit
AssigneeMediatek Inc.
InventorsChien-Wei Tseng, Ming-Da Tsai
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Abstract
A power amplifier system includes a differential power amplifier and a bias circuit. The differential power amplifier is arranged for receiving a differential input pair to generate an output signal. The bias circuit is arranged for generating a bias voltage to bias the differential power amplifier, and the bias circuit comprises a source follower for receiving a reference voltage to generate the bias voltage.
Claims20
A power amplifier system, comprising:
- a differential power amplifier, for receiving a differential input pair to generate an output signal;
- a bias circuit, for generating a bias voltage to bias the differential power amplifier, wherein the bias circuit comprises:
- a source follower, for receiving a reference voltage to generate the bias voltage.
A power amplifier system, comprising:
- a power amplifier, for receiving an input signal to generate an output signal;
- a bias circuit, for generating a bias voltage to an input node of the power amplifier, wherein the bias circuit comprises:
- a source follower, for receiving a reference voltage to generate the bias voltage to the input node of the power amplifier;
- wherein there is no physical resistor positioned between an output node of the source follower and the input node of the power amplifier.
A bias circuit for biasing a differential power amplifier, wherein the differential power amplifier receives the differential input pair from a transformer, and the bias circuit comprises:
- a source follower, for receiving a reference voltage to generate a bias voltage to a center tap of the transformer to bias the differential power amplifier.
Dependencies are inferred from the claim text.