Bias circuit for a power amplifier

Details Bias circuit for a power amplifier Bias circuit for a power amplifier

1996-06-28

1998-05-26

Mottola, Steven

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

330134, 330136, H03F 368, H03G 320

Patent

active

057572291

ABSTRACT:
A method for amplifying an RF input signal using a power amplifier (105, 107 or 205, 207) comprises the steps of dividing or quadrature splitting (103) the RF input signal into an in-phase signal and a quadrature phase signal. A carrier amplifier bias input (111, 211) signal is varied relative to the magnitude of the RF input signal. A peaking amplifier bias input (113, 213) signal is varied relative to the magnitude of the RF input signal. The in-phase signal is amplified using a carrier amplifier (105, 205) to produce a first amplified signal. The quadrature phase signal is amplified using a peaking amplifier (107, 207) to produce a second amplified signal. The first amplified signal and the second amplified signal are combined (115, 117), in phase, to produce an output signal.

REFERENCES:
patent: 5311143 (1994-05-01), Soliday
patent: 5420541 (1995-05-01), Upton et al.
patent: 5568086 (1996-10-01), Schuss et al.

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