Amplifiers – With plural amplifier channels – Redundant amplifier circuits
Patent
1999-07-12
2000-12-12
Shingleton, Michael B
Amplifiers
With plural amplifier channels
Redundant amplifier circuits
254278, 381109, H03F 368
Patent
active
061604488
ABSTRACT:
A digitally-controlled variable-gain amplifier is disclosed, which comprises a polarization means to transform the input signal into differential signals of positive and negative polarity; first and second gain blocks, each composed of dual-multiplying digital-to-analog converters, which multiply the polarized signals to produce positive and negative amplified signals; and a differential amplification means which receives the amplified signals, and subtracts them from each other. The resulting output signal is proportional to the input signal and yields a 3 dB improvement in signal-to-noise ratio over a single multiplying digital-to-analog converter stage. A plurality of amplification chains, each comprising a first and second gain block, may be used to amplify the differential signals for summing by the differential amplification means to provide a greater signal-to-noise ratio improvement.
REFERENCES:
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patent: 3911372 (1975-10-01), Seidel
patent: 4155047 (1979-05-01), Rubens et al.
patent: 4989074 (1991-01-01), Matsumoto
patent: 5313172 (1994-05-01), Vagher
patent: 5523721 (1996-06-01), Segawa et al.
patent: 5677962 (1997-10-01), Harrison et al.
Aphex Systems
Shingleton Michael B
LandOfFree
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