Parallel preamplifier and equalizer

Details Parallel preamplifier and equalizer Parallel preamplifier and equalizer

1996-04-02

1998-01-27

Mottola, Steven

Amplifiers

Signal feedback

Plural amplifier channels

330124R, H03F 368

Patent

active

057125910

ABSTRACT:
A preamplifier for processing an audio signal includes an equalizing and amplifying circuit comprised of parallel operational amplifiers, each with a feedback impedance circuit and an adjustable source impedance circuit. The adjustable source impedance circuit provides the preamplifier with a super-gain region in the high audio and supersonic frequency range. A summer adds the output of the parallel operational amplifiers to produce a single output signal. The parallel operational amplifiers, with the summer, gives the preamplifier unique low noise characteristic with an improved signal to noise ratio over a single operational amplifier with the same gain. The preamplifier may include an optional second stage for further equalizing and amplifying of the output signal.

REFERENCES:
patent: 4631490 (1986-12-01), Takahashi
patent: 4786878 (1988-11-01), Botti

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