Circuit arrangement for amplifying weak sensor currents

Details Circuit arrangement for amplifying weak sensor currents Circuit arrangement for amplifying weak sensor currents

1991-07-23

1993-10-26

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including signal feedback means

250214A, 330307, 330308, H03F 134

Patent

active

052569861

ABSTRACT:
Described is a circuit arrangement for amplifying weak sensor currents, in particular the photoelectric current of a photoelectric diode (1), in which the photoelectric diode is connected to the base or gate electrode of a transistor (2). A constant current source (3) is connected into the collector circuit of the transistor (2). Connected between the collector and the base is a negative feedback which includes a current step-down circuit using at least one current mirror (6). The mother or sum current (I.sub.S) is coupled out as the amplified signal current.

REFERENCES:
patent: 4259643 (1981-03-01), Monticelli et al.
patent: 4504797 (1985-03-01), Eatock
patent: 4574249 (1986-03-01), Williams
patent: 4904860 (1990-02-01), Okagaki

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