Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1998-09-30
2000-09-05
Mottola, Steven J.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330260, H03F 345
Patent
active
06114908&
ABSTRACT:
The present invention describes a bipolar impedance converter circuit, which comprises a differential amplifier that has a closed-loop control circuit in its negative feedback loop. This closed-loop control circuit comprises npn transistors, which because of their relatively low stray capacitances and their fast switching speed provide an impedance converter circuit with greater invulnerability to disturbances in the supply voltage and have faster switching behavior than known circuits in the prior art, which use pnp transistors in their negative feedback loop.
REFERENCES:
patent: 5045807 (1991-09-01), Ishihara et al.
patent: 5260672 (1993-11-01), Vorel
patent: 5345073 (1994-09-01), Chang et al.
Japanese Patent Abstract No. 58-159006 (Nakagawa), dated Sep. 21, 1983.
Delker Klaus
Wilhelm Wilhelm
Greenberg Laurence A.
Lerner Herbert L.
Mottola Steven J.
Siemens Aktiengesellschaft
Stemer Werner H.
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