Light receiving circuit, light receiving method, and storage...

Details Light receiving circuit, light receiving method, and storage... Light receiving circuit, light receiving method, and storage...

2011-02-01

2011-02-01

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S214100

Reexamination Certificate

active

07880129

ABSTRACT:
The PD converts the light into a current signal and supplies the converted a current signal to a TIA and a light intensity measuring unit. The TIA converts the current signal into a voltage signal. The CDR circuit identifies whether the voltage signal is 1 data or 0 data for reproduction. The counter counts the 1 data and 0 data, calculates their ratio. The control unit refers to light intensity data from the light intensity measuring unit and a ROM, acquires an optimum ratio, and determines whether the ratio supplied from the counter is the optimum ratio. When the ratio is not the optimum one, the control unit controls the threshold voltage setting unit to set the threshold voltage so that the ratio is the optimum one.

REFERENCES:
patent: 2003198475 (2003-07-01), None

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