Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1984-06-28
1986-12-09
Mullins, James B.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330144, 330284, 330310, H03F 132
Patent
active
046282785
ABSTRACT:
An amplifying system and method produces a substantial reduction in the D.C. and even-order harmonics in an output signal by employing a first inverting amplifying stage cascaded with an attenuating stage which is cascaded with a second inverting amplifying stage. The electrical characteristics of each of the two inverting amplifying stages are substantially the same. The gain, in dB, exhibited by each of the amplifying stages is substantially equal to the attenuation loss, in dB, produced by the attenuator stage. Conventional components and fabrication techniques allow substantial attenuation of the D.C. and even-order harmonic components produced by the nonlinearities in the active devices of the amplifiers as compared to a single amplifier case producing the same gain A.
REFERENCES:
patent: 3971993 (1976-07-01), Constant
Prasad et al., "Low Noise, Low Frequency Amplifier", Electro-Technology, vol. 15, No. 4, Jul.-Aug. 1971, pp. 133-135.
John Fluke Mfg. Co. Inc.
Mullins James B.
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