Amplifier with multiple switched stages and noise suppression

Details Amplifier with multiple switched stages and noise suppression Amplifier with multiple switched stages and noise suppression

1991-11-20

1993-04-06

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330207A, 330251, 455108, H03F 338

Patent

active

052007073

ABSTRACT:
An amplifier has at least several stages activated only to one of two bi-level states controlled in response to the value of an input source exceeding a threshold for each stage. Each stage has a different threshold. The thresholds and source are arranged so that the stages change between the bi-level states as the value of the source changes relative to the thresholds of the different stages. Bi-level outputs of the stages are summed together. The values of the thresholds are continuously varied by a small amount relative to a predetermined maximum value for the source in response to a noise source that is independent of the signal source. A power supply for the stages includes an AC-DC converter having plural primary windings and several secondary windings, one for each of the stages. The windings are coupled together so that at all times loading of the primary windings by the secondary windings as a result of activation of the output stages is approximately equal. The stages are controlled so that the sum of the outputs of the stages remains a predetermined function despite one or a few of the stages failing.

REFERENCES:
patent: 4164714 (1979-08-01), Swanson
patent: 4369409 (1983-01-01), Kyrian et al.
patent: 4403197 (1983-09-01), Swanson
patent: 4468626 (1984-08-01), Swanson
patent: 4560944 (1985-12-01), Furrer
patent: 4724420 (1988-02-01), Woodard
patent: 4730167 (1988-03-01), Beeken et al.
patent: 4896372 (1990-01-01), Weaver

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