Amplifier circuit and method for generating a bias voltage

Details Amplifier circuit and method for generating a bias voltage Amplifier circuit and method for generating a bias voltage

1997-06-27

1999-07-13

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including current mirror amplifier

330296, 330311, H03F 368

Patent

active

059232170

ABSTRACT:
A low-noise amplifier circuit (40) and a method for generating a bias voltage within the amplifier circuit (40). The amplifier circuit includes a cascode configured circuit (15) having a common emitter transistor (12) biased by a current sourcing circuit (43) and a common base transistor (13) biased by a bias voltage generator (21). The current sourcing circuit (43) measures a base current of the common emitter transistor (12) and transmits the base current to a current mirror (41). Further, a current source (50) transmits a bias current to the current mirror (41). The current mirror sums the currents from the current sourcing circuit (43) and the current mirror (41) and generates a mirror output current. A portion of the mirror output current drives the bias voltage generator (21) and a portion of the mirror output current serves as the base current of the common base transistor (13).

REFERENCES:
patent: 4263562 (1981-04-01), Seiler
patent: 4591804 (1986-05-01), Van Tuijl
patent: 4940949 (1990-07-01), Landi
patent: 5049834 (1991-09-01), Kasai
patent: 5254957 (1993-10-01), Lauffenburger
patent: 5491454 (1996-02-01), Matz
patent: 5521553 (1996-05-01), Butler
patent: 5535444 (1996-07-01), Grandfield
patent: 5637993 (1997-06-01), Whitney et al.

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