Power amplifier and method thereof

Details Power amplifier and method thereof Power amplifier and method thereof

2008-09-02

2008-09-02

Choe, Henry K (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including plural stages cascaded

C330S051000

Reexamination Certificate

active

11536134

ABSTRACT:
A power amplifier amplifying an input signal to generate an output signal, comprising a cascode unit and a bias circuit. The cascode unit comprises a cascode stage, a first input stage, and a second input stage. The cascode stage generates the output signal. The first input stage, in cascode with the cascode transistor, has a first signal input to be biased to provide a first amplifier gain. The second input stage, in cascode with the cascode transistor, has a second signal input to be biased to provide a second amplifier gain. The bias circuit, coupled to the first and the second input stages comprises first and second switches. The first switch, coupled to the first input stage, is switched on to bias the first input stage with a bias voltage. The second switch, coupled to the second input stage, is switched on to bias the second input stage with the bias voltage.

REFERENCES:
patent: 6987422 (2006-01-01), Vice
patent: 7023272 (2006-04-01), Hung et al.
patent: 7190230 (2007-03-01), Jin et al.

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