Current-to-voltage conversion IC and a photoelectric conversion

Details Current-to-voltage conversion IC and a photoelectric conversion Current-to-voltage conversion IC and a photoelectric conversion

1998-04-16

2000-09-05

Lee, John R.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

330282, 330308, H03F 308, H03F 345, H03G 330

Patent

active

061146862

ABSTRACT:
To realize a current-to-voltage conversion IC and a photoelectric conversion IC in which the available frequency range does not become narrower as the conversion gain is increased, in a current-to-voltage conversion IC that has a differential amplifier to which a negative feedback resistor of variable resistance is connected and a photodiode connected to the input terminal of the differential amplifier so that the output current of the photodiode is converted into a voltage by means of the negative feedback resistor, the differential amplifier is provided with a switch for varying the capacitance of a capacitor used as a phase compensating element so that the resistance of the negative feedback resistor and the capacitance of the differential amplifier are varied in an interlocked manner in accordance with a signal fed from outside.

REFERENCES:
patent: 4066976 (1978-01-01), Dickopp et al.
patent: 4216434 (1980-08-01), Wermuth
patent: 5363055 (1994-11-01), Ribner
patent: 5451904 (1995-09-01), Terada et al.
patent: 5602511 (1997-02-01), Woolaway
patent: 5793254 (1998-08-01), O'Connor
patent: 5805019 (1998-09-01), Shin
patent: 5812030 (1998-09-01), Inami et al.
patent: 5917379 (1999-06-01), Ashby et al.

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