Method and system for reducing noise in a hybrid matrix amplifie

Details Method and system for reducing noise in a hybrid matrix amplifie Method and system for reducing noise in a hybrid matrix amplifie

1996-05-31

1998-06-09

Mullins, James B.

Amplifiers

With plural amplifier channels

Redundant amplifier circuits

330149, 330295, H03F 368, H03F 126

Patent

active

057641048

ABSTRACT:
An input signal (102) and a dithering signal (106) are coupled to an input of a n by m transform matrix (98). The input signal (102) and the dithering signal (106) are transformed to produce m transformed signals, which are then amplified using a plurality of amplifiers (64). The amplified signals are then input into an m by n inverse transform matrix (100) that performs an inverse transform to produce a low noise output signal. The low noise output signal may be passed through a band pass filter (74) to remove out-of-band noise derived from the dithering signal and provide a filtered output signal (110). The transform matrix (98) and inverse transform matrix (100) may be implemented with Fourier transform matrices or a Butler transform matrices.

REFERENCES:
patent: 3732217 (1973-05-01), Gerset et al.
patent: 3917998 (1975-11-01), Welti
patent: 5287069 (1994-02-01), Okubo et al.
Sandrin, W.A., "The Butler Matrix Transponder", Comstat Technical Review, vol. 4, No. 2, Fall 1974, pp. 319-344.
Meredith, Sheldon, presentation on Cellwave Smart System at "Second Annual Workshop on Smart Antennas in Wireless Mobile Communications", Jul. 20-21, 1995, Stanford University.
Gerst, Carl. W. "Hybrid Matrix Amplifiers", An Anaren White Paper, Nov. 1995.

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