Photodiode amplifier circuit with improved sensitivity to high e

Details Photodiode amplifier circuit with improved sensitivity to high e Photodiode amplifier circuit with improved sensitivity to high e

1994-12-16

1996-03-12

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250214LA, 250214LS, 330 59, H01J 4014

Patent

active

054988659

ABSTRACT:
A photodiode amplifier includes an input stage having a first pair of transistors connected as a differential pair to have a low input impedance and a current source connected into the input stage to bias the pair of transistors. A photodiode is connected into the input stage across the transistors so as to provide differential effect to current flowing through the transistors. By means of such connection, the photodiode is presented with low input impedance, its time constant is accordingly lowered, and the system response of the photodiode amplifier is extended into higher frequencies. The photodiode amplifier is of particular use in an illuminant discriminator capable of distinguishing a range of separate illuminants, including high efficiency fluorescent lighting within the passband of the photodiode amplifier.

REFERENCES:
patent: 4045731 (1977-08-01), Tokunou et al.
patent: 4220412 (1980-09-01), Shroyer et al.
patent: 4540946 (1985-09-01), Sainz et al.
patent: 4805236 (1989-02-01), Urala
patent: 4827119 (1989-05-01), Gaboury
patent: 5012202 (1991-04-01), Taylor
patent: 5037198 (1991-08-01), Gaboury
patent: 5087892 (1992-02-01), Hayashi
patent: 5103084 (1992-04-01), Williams et al.
patent: 5345073 (1994-09-01), Chang et al.

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