Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1995-12-01
1997-12-30
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330284, H03G 330
Patent
active
057035350
ABSTRACT:
A circuit arrangement for amplitude-dependent attenuation of a television signal supplies amplitude values below a predeterminable limit value as an output signal amplified by a first gain factor, and, at amplitude values above the limit value, supplies the part of the amplitude below the limit value as an output signal amplified by the first gain factor and parts of the amplitude above the limit value as an output signal amplified by a second gain factor, the second gain factor being chosen to be smaller than the first gain factor. To realize this circuit arrangement in the current range, the television signal is a current signal which is applied to a main branch (1; 13) and a sub-branch (2; 14) in which the current signal is applied to the emitter of at least one transistor (3,5; 15,18) via a resistor (4,6; 16,19), the base of each transistor (3,5; 15,18) is biased with respect to a reference potential by DC sources (7,8; 17,24), the collector current of the transistor (3; 15) in the main branch (1; 13) essentially represents the output signal, and the limit value is predeterminable by the difference between the base potentials of the two transistors (3,5; 15,18) and the second gain factor is predeterminable by means of the resistance ratio between the two resistors (4,6; 16,19).
REFERENCES:
patent: 3961361 (1976-06-01), Avins et al.
patent: 4242643 (1980-12-01), Leidich
patent: 4987383 (1991-01-01), Mauthe
Goodman Edward W.
Mottola Steven
U.S. Philips Corporation
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