Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1989-08-31
1991-09-03
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330280, 379347, H03G 330
Patent
active
050458094
ABSTRACT:
An Automatic Gain Control (AGC) circuit which compensates receiving sensitivity on the part of subscribers depending on the line status of a central office line (C.O.L.) in a private branch exchange (PBX), by means of using an analog system, utterly. In order to achieve these objects, the present invention includes: an amplification circuit for amplifying input signals; a rectification circuit, connected to the amplification circuit for converting output signals of the amplification into DC voltage whose level corresponds to said output signals; first and second differential amplifiers for receiving the DC voltage and given automatic gain control signals and comparing the two signals so as to output a given DC voltage level; and first and second impedance control circuits, connected to output ports of said first and second differential amplifiers respectively, for controlling output impedances thereof in response to the outputs of the first and second differential amplifiers, the output ports of the first and second differential amplifiers being connected to input port of the amplification circuit through a capacitance.
REFERENCES:
patent: 3927381 (1975-12-01), Sato et al.
Bushnell Robert E.
Mullins James B.
Samsung Electronics Co,. Ltd.
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