Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1987-05-04
1989-03-28
Wan, Gene
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330 9, H03F 126
Patent
active
048167711
ABSTRACT:
An amplifier arrangement for reducing an unwanted d.c. offset of an amplitude-varying input signal, has a threshold circuit (A.sub.3, B.sub.3) and an amplifier stage (A.sub.1, B.sub.1) coupled thereto, which threshold circuit (A.sub.3, B.sub.3) is provided with a bistable trigger circuit (A.sub.4, B.sub.4). This bistable trigger circuit (A.sub.4, B.sub.4) reduces the d.c. level of the input signal or output signal of the amplifier stage (A.sub.1, B.sub.1) in a steplike manner when this d.c. level increases. The bistable trigger circuit (A.sub.4, B.sub.4) has a hysteresis which is larger than the maximum amplitude variation of the input signal as a result of the desired signal component, so that a linear amplification of this desired signal component is possible and, in the case of a non-varying d.c. level, variations of the input signal due to the desired signal component cannot give rise to a d.c. reduction. This amplifier arrangement may be used in a phase-locked loop of a directly mixing synchronous AM receiver, which phase-locked loop is used for generating a synchronous local carrier in order to increase the input dynamic range of the receiver.
REFERENCES:
patent: 4277695 (1981-07-01), Wilber et al.
Marion Michael E.
U.S. Philips Corporation
Wan Gene
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