Amplifiers – With amplifier bypass means
Patent
1989-06-05
1991-02-26
Mullins, James B.
Amplifiers
With amplifier bypass means
330304, 379398, 333 28R, H03F 100, H03H 500
Patent
active
049964976
ABSTRACT:
Circuitry is disclosed which compensates for magnitude and phase variations in the transfer function of a transmission medium. The medium is characterized by amplitude and phase variations in its transfer function wherein the amplitude variations produce increasing loss in the medium as frequency increases. The circuitry possesses an inverse characteristic to these variations, thereby generating a relatively flat magnitude characteristic for the medium-circuitry combination. The circuitry includes a buffer amplifier that receives a portion of an input signal, a network coupled to the amplifier and having zero-pole pairs in its signal transfer function, and a summer which has both the input signal and the output of the network as inputs. Accordingly, the compensation circuit has an overall transfer function which has fixed poles but adjustable zeros, these zeros being dependent on the amplifier gain and the portion of the input signal applied to the amplifier.
REFERENCES:
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patent: 4099022 (1978-07-01), Fullerton et al.
patent: 4273963 (1981-06-01), Seidel
patent: 4329655 (1982-05-01), Nojima et al.
patent: 4450555 (1984-05-01), Pays
patent: 4479228 (1984-10-01), Crane
Cordell, "A New Family of Active Variable Equilizers", IEEE Transactions on Circuits and Systems, vol. CAS-29, No. 5, May 1982, pp. 316-322.
American Dynamics Corporation
Michaelson Peter L.
Mullins James B.
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