Patent ID: 6922107

Claim:
A circuit comprising: a power amplifier; a dual bias supply to bias the power amplifier, the dual bias supply comprises: a first transistor including an emitter coupled to ground, a first resistor coupled between a reference voltage node and a collector of the first transistor, a second transistor including a base coupled to the collector of the first transistor, including a collector coupled to a supply voltage node, and including an emitter coupled to the base of the first transistor, a second resistor coupled between the base of the first transistor and the ground node, a third transistor including a collector coupled to the base of the third transistor, a third resistor coupled between the reference voltage node and the common node formed of the collector and base of the third transistor, a fourth resistor coupled between the emitter of the third transistor and ground, and a fifth resistor coupled between the base of the third transistor and a common node formed of the emitter of the second transistor and a base of the power amplifier.