Photocurrent detector circuit with high sensitivity, fast respon

Details Photocurrent detector circuit with high sensitivity, fast respon Photocurrent detector circuit with high sensitivity, fast respon

1995-06-07

1996-12-31

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250554, 330110, H01J 4014, H03F 1700, G01J 528

Patent

active

055896820

ABSTRACT:
A photocurrent detector circuit includes a photodiode coupled to an input terminal of a first operational amplifier. A first resistor has a first end coupled to the photodiode and a second end coupled to an output terminal of the first operational amplifier. A first diode has a first end coupled to the photodiode. A second resistor has a first end coupled to a second end of the first diode. A low gain bias network is coupled between a second end of the second resistor and the output terminal of the first operational amplifier. A second diode has a first end coupled to the photodiode. A clamp bias network is coupled between a second end of the second diode and the output terminal of the first operational amplifier. Preferably, the photodiode and the first and second diodes include silicon carbide. The detector may further include second and third operational amplifiers coupled to the output terminal of the first operational amplifier. A MOSFET differential pair can be coupled between the photodiode and the first operational amplifier to form a differential amplifier.

REFERENCES:
patent: 3440557 (1969-04-01), Sundeen, Jr.
patent: 3999060 (1976-12-01), Skagerlund
patent: 5030925 (1991-07-01), Taylor
patent: 5202553 (1993-04-01), Geller

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