Paralleling digital-input amplifiers

Details Paralleling digital-input amplifiers Paralleling digital-input amplifiers

2006-07-25

2006-07-25

Choe, Henry (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C330S295000

Reexamination Certificate

active

07081794

ABSTRACT:
Two or more digital-input RF amplifiers are configured in parallel such that a combiner combines their respective outputs to generate a relatively large composite RF output signal. A feedback control architecture minimizes the phase differences between the various amplifier outputs so that the outputs can be efficiently combined. The feedback control can measure the return loss for each amplifier to determine how to adjust each amplifier's phase. In some embodiments, the feedback control can also measure the composite RF output signal for use in phase adjustment. In certain implementations, phase adjustment is implemented by an iterative coarse phase-adjustment mode (e.g., based on either the return loss or the composite output signal) followed by an iterative fine phase-adjustment mode (e.g., based on the return loss).

REFERENCES:
patent: 5304943 (1994-04-01), Koontz
patent: 5872481 (1999-02-01), Sevic et al.
patent: 5974041 (1999-10-01), Kornfeld et al.
patent: 2003/0174018 (2003-09-01), Cooper et al.
patent: 2005/0001674 (2005-01-01), Saed et al.

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