Source intensity adjustment apparatus for optical channel

Details Source intensity adjustment apparatus for optical channel Source intensity adjustment apparatus for optical channel

1990-02-05

1991-05-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

25023113, G01J 132

Patent

active

050158368

ABSTRACT:
An improved design for an optical encoder with a compensation feedback signal for compensating for effects of time and temperature on the photoemission characteristics of the encoder's light source. By using a current mirror, the photodiodes which normally provide only the data signal now provide both the data signal and the compensation feedback signal, thereby eliminating the need for a separate, dedicated photodiode for the compensation feedback signal. This results in eliminating the necessity of matching the electrical operating characteristics of the data photodiodes to those of a compensation feedback photodiode. This further results in eliminating the large die area required for including a compensation feedback photodiode in an integrated circuit design.

REFERENCES:
patent: 4620094 (1986-10-01), Tani et al.
patent: 4649267 (1987-03-01), Ray
patent: 4712000 (1987-12-01), Yoshikawa et al.

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