Sensing light and sensing the state of a memory cell an aid of a switch controlled by a schmidt trigger
US7476840B2 · kind B2 · utility
1Cited by
7References
10Claims
0Family size
Assignee
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Key dates
| Filing date | May 8, 2007 |
| Grant date | Jan 13, 2009 |
| Priority date | — |
| Expiry date | May 8, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11C2211/5644
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A light-to-frequency converter includes a switch (130) connected in series with a reverse-biased photodiode (120). A node (150) in the current path through the switch and the photodiode is connected to the input of a Schmidt trigger (160), whose output controls the switch. New techniques are provided for motion compensation, partial readouts, dark current elimination, non-destructive testing, and sensing the state of a memory cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.