Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1994-10-05
1996-06-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330260, 330292, H03F 345, H03F 114
Patent
active
055259308
ABSTRACT:
A differential amplifier comprises a Darlington differential pair (T.sub.1 /T.sub.3, T.sub.2 /T.sub.4) and a cross-coupled transistor pair (T.sub.5, T.sub.6) to increase the transconductance of the Darlington differential pair (T.sub.1 /T.sub.3, T.sub.2 /T.sub.4). The negative input impedance of the differential amplifier as a result of the presence of the cross-coupled differential pair (T.sub.5, T.sub.6) is compensated for at high frequencies and the gain of the differential amplifier is reduced by a compensation circuit with a capacitor (30) between the control electrodes of the transistors of the cross-coupled differential pair (T.sub.5, T.sub.6) and with resistors (26, 28) in series with the control electrodes of the transistors of the cross-coupled differential pair (T.sub.5, T.sub.6).
REFERENCES:
patent: 4476440 (1984-10-01), Bennett, Jr.
Pothast Hendrik J.
Voorman Johannes O.
Gathman Laurie E.
Mottola Steven
U.S. Philips Corporation
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