Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1995-06-07
1998-05-26
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
327359, H03F 345
Patent
active
057572330
ABSTRACT:
The present invention relates to a complementary transistor circuit and, an amplifier using it, and in particular, to a video amplifier for amplifying video signals and a high-definition CRT display device. In amplifying inputted video signals by using a multiplexer, a gain controller and a current mirror amplifier, each element circuit is formed by using complementary transistor circuits. Circuit simplification is thus attained. In addition, higher precision and band broadening has been realized owing to adoption of a current operation. Further, the present invention makes it possible to eliminate direct from the high voltage output completely by providing a low-voltage output circuit for feedback having a similar relationship with respect to the high-voltage video output stage of the video amplifier, thereby performing negative feedback via a sample-and-hold circuit. This also serves to broaden the bandwidth and reduce power dissipation.
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Kato Kazuo
Sase Takashi
Sato Hideo
Yamashita Kenkichi
Hitachi , Ltd.
Mottola Steven
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