Wideband amplifier circuit using npn transistors

Details Wideband amplifier circuit using npn transistors Wideband amplifier circuit using npn transistors

1993-09-23

1994-11-15

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330257, 330311, H03F 304

Patent

active

053651987

ABSTRACT:
A wideband amplifier circuit provides high current gain and a wide bandwidth by employing only npn transistors, which have better high-frequency characteristics than those of pnp transistors, in the signal path. Wideband current amplification is achieved using npn transistors in a current-mirror configuration, with base-emitter voltage matching to permit the current gain to be easily set as a function of transistor area. The wideband amplifier circuit can also be used in a differential wideband amplifier configuration to obtain a combination of high current gain, wide bandwidth and wide output swing not obtainable with conventional differential amplifiers.

REFERENCES:
patent: 3399357 (1968-08-01), Weilerstein
patent: 4013973 (1977-03-01), van de Plassche
patent: 4591804 (1986-05-01), van Tuijl
patent: 5045807 (1991-09-01), Ishihara et al.
FIG. 4.26(B) of Analysis and Design of Analog Integrated Circuits, Second Edition, Gray & Meyer, John Wiley & Sons, 1977, p. 285.

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