Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1984-05-14
1986-04-08
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330138, 330145, 330284, 330308, H03G 330
Patent
active
045815895
ABSTRACT:
A preclipping control technique is utilized to prevent the occurrence of clipping distortions evidenced in the output of an amplifier. Reference means provides an upper voltage level slightly lower than the upper saturation or clipping level of the amplifier output signal, and also provides a lower voltage level slightly higher than the lower saturation or clipping level of the amplifier output signal. A comparator is connected to the output of the amplifier and compares the output signal with the reference levels. Under normal conditions, when the output signal is located within the range lying between the upper and lower reference levels, the amplifier input signal is not attenuated. However, when the output signal goes out of the range, this will activate an attenuator connected between a signal source and the amplifier to introduce a controlled attenuation in the amplifier input signal; clipping is prevented.
REFERENCES:
patent: 3248642 (1966-04-01), Rothschild
patent: 4048573 (1977-09-01), Evans et al.
patent: 4233566 (1980-11-01), Nestorovic
Mullins James B.
TOA Electric Co., Ltd.
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