Low noise signal detection for a charge transfer device by quadrature phasing of information and reset noise signals
US4689808A · kind A · utility
13Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 1986 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | Jan 31, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N25/65
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Charge transfer devices typically include a periodically reset floating element output stage coupled to an FET amplifier for sensing the transferred charges. For reducing both low-frequency l/f noise and high-frequency reset noise, the duty factor of the device clocking signals and the reset signal are picked so that at a selected multiple of the clock signal repetition rate, the information component is in phase quadrature with the reset noise component. The charge transfer device output signal is then synchronously detected with a reference signal which is in phase with the selected multiple of the information component.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.