Column amplifier capacitor switch circuit to adjust analog gain
US11290674B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2020 |
| Grant date | Mar 29, 2022 |
| Priority date | — |
| Expiry date | Dec 18, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/8037
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A pixel cell readout circuit includes an amplifier and a capacitor switch circuit that includes a first routing path coupled to an input of the amplifier. A second routing path includes switches coupled in series along the second routing path. A first end of the second routing path is coupled to a bitline. A second end of the second routing path is coupled to an output of the amplifier. Only one of the switches is turned off and a remainder of the switches are turned on. Capacitors are coupled in parallel between the first routing path and the second routing path. A first end of each of the capacitors is coupled to the first routing path. A second end of each of the capacitors is coupled to the second routing path. The switches are interleaved among the second ends of the capacitors along the second routing path.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.