Correlated sampling amplifier
US4717830A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1986 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Jul 18, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/33
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An infrared imaging system includes a scanner of infrared radiation emanating from a subject, the radiation being scanned past an array of radiation detectors disposed on a common substrate. A set of amplifiers connecting with a multiplexer is built upon the array of detectors, individual ones of the amplifiers connecting with respective ones of the detectors. Each amplifier is composed of a structure having the components of a charge-coupled device and includes circuitry for pulsing a charge-coupled device repetitively. A transistor switching circuit interconnects a detector with its corresponding charge-coupled device for modulating the magnitude of charge in each charge packet propagating through the device. A pair of integrators is disposed on the common substrate, and a steering circuit steers modulated and unmodulated pulses to alternate ones of the integrators. A subtraction circuit forms the difference of output integrated signals from the integrators to produce amplified detected signals which are substantially free of drift associated with semiconductor material used in fabricating the detectors and the charge-coupled devices. Samples of the detected signals provide pixel…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.