Source intensity adjustment apparatus for optical channel
US5015836A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 1990 |
| Grant date | May 14, 1991 |
| Priority date | — |
| Expiry date | Feb 5, 2010 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02B20/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.