Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1993-07-22
1995-07-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
327563, H03F 345
Patent
active
054324777
ABSTRACT:
There is provided a gain control Gilbert amplifier circuit which can be more easily controlled for variation in the gain characteristics of each predriver integrated circuit for primary color image signals R, G, and B, and the variation caused by light emitting efficiency than the prior art. The gain control Gilbert amplifier circuit also operates in a wider frequency range than the conventional circuits, and has a large S/N ratio. One embodiment of the amplifier circuit comprises a grounded-base transistor amplifier circuit having rectifier elements, reference voltage sources, diodes connected to a differentially paired transistors. The rectifier elements are controlled so that a ratio of currents output from constant-current sources can be selected to enable the frequency characteristic of the amplifier circuit to expand by a frequency range.
REFERENCES:
patent: 4075574 (1978-02-01), Gilbert
patent: 4292597 (1981-09-01), Niimura
patent: 5065112 (1991-11-01), Ishiguro
patent: 5256983 (1993-10-01), Nishiyama
Furuya Kiyoshi
Kawai Ryuichiro
Kawata Masato
Nishiyama Seiichi
Mottola Steven
Nguyen Trep H.
Sony Corporation
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