RF amplifier method and apparatus

Details RF amplifier method and apparatus RF amplifier method and apparatus

1996-11-14

1998-07-21

Mottola, Steven

Amplifiers

Signal feedback

Phase shift means in loop path

330129, 455126, H03F 134, H03G 320, H04B 104

Patent

active

057839689

ABSTRACT:
An RF power amplifier (100) includes a feedback loop with a loop phase, and is arranged for amplifying an RF signal (1). During an initial stabilizing mode (201), the amplifier is stabilized by applying a baseband reference signal (210) input via a reference input terminal to the feedback loop and adjusting the loop phase to an optimum value. Thereafter, during an amplifying mode (202), the RF signal is input via an RF input terminal and amplified while maintaining the loop phase at the optimum value. The feedback loop contains a baseband in-phase (I) path and a baseband quadrature (Q) path, and the baseband reference signal may be applied to the I path, the Q path, or both. The stabilizing and amplifying modes are fixed in duration and comprise a periodic cycle that is repeated. The input RF signal is substantially null during the stabilizing mode.

REFERENCES:
patent: 5021753 (1991-06-01), Chapman
patent: 5066923 (1991-11-01), Gailus
patent: 5134718 (1992-07-01), Gailus
patent: 5175879 (1992-12-01), Ellingson et al.
patent: 5469105 (1995-11-01), Sparks
patent: 5574992 (1996-11-01), Cygan et al.
"Amplifier Linearisation Using RF Feedback and Feedforward Techniques," Michael Faulkner and Mark A. Briffa, IEEE, 1995.

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