Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1985-03-11
1985-10-01
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including gain control means
330279, H03G 320
Patent
active
045448965
ABSTRACT:
An amplitude-adjusting circuit used for a contrast-adjusting circuit of resistor division type in which a video signal is applied across a pair of series-connected resistors and an output is produced from the junction point of the two resistors. At least one of the resistors is used as a variable resistor. The amplitude-adjusting circuit comprises a current source for supplying a constant current steadily between the terminals of the variable resistor, a high-gain amplifier for controlling the resistance value of the variable resistor, and a filter for separating the video signal component from the change of the value of the variable resistor represented by a voltage change, and introducing the resistance change to the high-gain differential amplifier.
REFERENCES:
patent: 4464635 (1984-08-01), Rypkema
W. Sansen et al., "An Integrated Wide-Band Variable-Gain Amplifier with Maximum Dynamic Range" IEEE Journal of Solid-State Circuit, Aug. 1974.
Ando Kunio
Funada Etuo
Maekawa Hitoshi
Miyajima Hiroyuki
Osawa Michitaka
Hitachi , Ltd.
Mullins James B.
Wan G.
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