Feedback type pre-amplifier

Details Feedback type pre-amplifier Feedback type pre-amplifier

1996-10-25

1998-12-01

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

250214A, 330308, 359189, H03F 132, H03F 1700

Patent

active

058444459

ABSTRACT:
A pre-amplifier disclosed in which low noise at the time of small input and linear amplification at the time of large input are compatible. In a pre-amplifier, such compatibility can be realized by constituting a current mirror circuit, with respect to a current of a first stage transistor in a transimpedance portion, by a by-passing transistor which is provided at an input side of the pre-amplifier. In such a configuration, by making a by-pass current flow proportionally to an input instantaneous current at the time of a large input, the transimpedance can be made small equivalently to thereby widen the dynamic range.

REFERENCES:
patent: 3996462 (1976-12-01), Fletcher et al.
patent: 4065668 (1977-12-01), Monticelli
patent: 4467289 (1984-08-01), Okada
patent: 5307023 (1994-04-01), Schade, Jr.
FETs as described in the proceeding of the 1992 IEICE fall conference, B979.
Proceeding of the 1992 IEICE general conference, B-1165.

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