Method and apparatus for controlling the gain of an avalanche photodiode with fluctuations in temperature
US7939790B1 · kind B1 · utility
7Cited by
2References
15Claims
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Key dates
| Filing date | Mar 3, 2008 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Jan 13, 2030 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F3/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus is provided for biasing an avalanche photodiodes (APD). The method includes developing a first output signal s(v1) from the APD when biased with a first bias voltage v1 and developing a second output signal s(v2) from the APD when biased with a second bias voltage v2, wherein s(v)=PRZM(v), (P) is an light power illuminating the APD, R is a responsivity of the APD, M(v) is an APD avalanche gain and Z is a trans-impedance amplifier gain (Z). The method continues by acquiring a ratio r=s(v1)/s(v2)=PRZM(v1)/[PRZM(v2)]=M(v1)/M(v2) and invoking a feedback control method to bias the APD using the ratio r.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.