Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-04-17
1998-02-17
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
327 89, 327563, 330257, 330260, H03F 345
Patent
active
057195293
ABSTRACT:
An operational amplifier and a digital signal transfer circuit in which an output voltage does not decrease instantly even if an abrupt change of input signal due to noise causes a high-to-low transition to be superposed on an input signal. The operational amplifier includes a differential pair of transistors with a first transistor having a collector that is grounded and a second transistor having an emitter connected to the emitter of the first transistor; a current mirror circuit with a third transistor having a collector connected to an output node of the differential pair of transistors and a fourth transistor having a base connected to a base of the third transistor; a fifth transistor having a collector connected to an output terminal and a base connected to an output node of the current mirror circuit; and a capacitive element connected between the output node of the current mirror circuit and the output terminal.
REFERENCES:
patent: 4500841 (1985-02-01), Morey
patent: 4672326 (1987-06-01), Cini et al.
patent: 5196741 (1993-03-01), Rustici
patent: 5592112 (1997-01-01), Nishibe
Kawahara Hironori
Kikuyama Seiichiro
Ono Yukio
Mitsubishi Denki & Kabushiki Kaisha
Mullins James B.
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