Radiation sensor
US7498584B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2006 |
| Grant date | Mar 3, 2009 |
| Priority date | — |
| Expiry date | May 5, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F77/957
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An energy selective radiation sensor has a photodetector and a transfer gate for controlling transfer of charge from the photodetector to a first sense node. A first readout circuit is provided for reading out charge from the first node. In use a first charge accumulated in the photodetector from a first predetermined portion of an energy spectrum of a radiation source is transferred to the first sense node. A second charge is accumulated in the photodetector from a second predetermined portion of the energy spectrum. The first charge is readout from the first sense node with the readout circuit, the second charge transferred to the first sense node and likewise readout. In embodiments of the invention, a second sense node and second transfer gate are provided and the first charge is read out through a first sense node and the second charge through the second sense node. In further embodiments a dump drain controlled by a dump gate is also provided to permit duty cycle control of sensitivity of the photodetector by selectively dumping and storing of charge accumulated in the photodetector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.