Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1981-05-28
1985-10-15
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330252, H03F 345
Patent
active
045477442
ABSTRACT:
An integrated amplifier arrangement in which the d.c. voltage gain is suppressed, which includes two transistors arranged as a differential pair with an output between the collectors of these transistors. In order to improve the high-frequency properties of the amplifier arrangement, the collector circuit of the transistors includes two load transistors in cascade with the two transistors arranged as a differential pair, each load transistor including an impedance in its base circuit in order to obtain an inductive input impedance on the emitter side of the transistor. In order to obtain direct-current and low-frequency negative feedback for eliminating the d.c. gain, the base electrodes are cross-coupled to the collector electrodes of the load transistors.
REFERENCES:
patent: 4418321 (1983-11-01), Bohme
Choma, "Actively Peaked Broadbanded Monolithic Amplifier", IEE Proceedings, vol. 127, No. 2, Apr. 1980, pp. 61-66.
Biren Steven R.
Mayer Robert T.
Mullins James B.
U.S. Philips Corporation
Wan G.
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