Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1991-08-12
1992-08-25
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330261, 330301, H03F 345
Patent
active
051422417
ABSTRACT:
A differential input circuit includes a first bias generating circuit, a second bias generating circuit, a differential circuit, a first capacitor, and a second capacitor. The first bias generating circuit applies an input signal and a bias voltage divided by first dividing resistors to a first source follower FET and outputs a resultant value through first level shift diodes. The second bias generating circuit applies a bias voltage divided by second dividing resistors to a second source follower FET and outputs a resultant value through second level shift diodes. The differential circuit includes first and second switching FETs respectively having gates connected to outputs of the first and second bias generating circuits. The first capacitor connects the output of the first switching FET to a gate electrode of the second switching FET. The second capacitor connects an output terminal of the second bias generating circuit to a gate electrode of the second source follower FET.
REFERENCES:
patent: 4963835 (1990-10-01), Saitoh
Morita Tomonori
Saito Hiromi
Yamamoto Ryuichiro
Mullins James B.
NEC Corporation
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