Multiple signal intermodulation reduction system

Details Multiple signal intermodulation reduction system Multiple signal intermodulation reduction system

2007-08-14

2007-08-14

Pascal, Robert (Department: 2817)

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

C375S296000

Reexamination Certificate

active

11057979

ABSTRACT:
An intermodulation product reduction or cancellation amplifier received two input signals that are split in quadrature wherein the inphase outputs are summed and then amplified as an inphase signal, and the quadrature outputs are fixed-phase phase-shifted, then summed and then amplified as a quadrature signal. The inphase and quadrature signals are fed into an output hybrid for canceling intermodulation products, where the fixed-phase phase shift is +/−60° for reducing 3rd order, +/−36° for reducing 5th order, and +/−25.71° for reducing 7th order intermodulation products, for examples, for improved signal communications of the two signals over a common antenna or link.

REFERENCES:
patent: 4131859 (1978-12-01), Valle
patent: 4217554 (1980-08-01), Brzozowski
patent: 4656434 (1987-04-01), Selin
patent: 5764104 (1998-06-01), Luz
patent: 6268768 (2001-07-01), Blodgett

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