Photoelectric current and voltage converting circuit

Details Photoelectric current and voltage converting circuit Photoelectric current and voltage converting circuit

2005-11-01

2005-11-01

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140RC, C330S110000

Reexamination Certificate

active

06960754

ABSTRACT:
A photoelectric current and voltage converting circuit converts a photo current Ipd generated by the input to photo diode into a voltage Va by a feedback resistor connected to an inverting input and an output of an amplifier, and compares the output voltage Va with a threshold voltage Vth from a reference voltage circuit to output a binary signal. Divided voltage Vb gained from a connecting node of the feedback resistors is inputted to a non-inverting input of the reference voltage circuit and is offset to a higher voltage by Vos to generate a threshold voltage Vth. As a result, the threshold voltage Vth can be supplied which impedance is low and robust to noise, and errors of the comparator or jitter of the output of the comparator are suppressed.

REFERENCES:
patent: 5061859 (1991-10-01), Lovelace et al.
patent: 5287107 (1994-02-01), Gampell et al.
patent: 5406071 (1995-04-01), Elms
patent: 6166566 (2000-12-01), Strong
patent: 2031630 (1980-04-01), None
patent: S63-236971 (1988-10-01), None
patent: 3121339 (2000-10-01), None

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