Current steering architecture with high supply noise rejection
US11363228B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 23, 2021 |
| Grant date | Jun 14, 2022 |
| Priority date | — |
| Expiry date | Mar 23, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/18
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Techniques are described for implementing ramp voltage generators with current steering architectures that provide high power supply noise rejection. For example, a current steering architecture uses a sample and hold block and a driver block to control and drive a current steering network. Both generate signals that track supply voltage variations, and those signals are used to generate a ramp voltage. For image sensor applications, image tolerance to ramp noise can be very low when the ramp voltage is low, but can increase appreciably as the ramp voltage increases. As such, embodiments can be implemented to provide high PSR at low ramp voltages, even if the PSR degrades at higher ramp voltages, while maintaining high linearity over the entire ramp voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.