Capacitive digital to analog convertor (CDAC) with capacitive references
US11233524B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 15, 2021 |
| Grant date | Jan 25, 2022 |
| Priority date | — |
| Expiry date | Jan 15, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/468
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed are circuits and methods for a CDAC with capacitive references. Individual reference capacitors can be implemented to provide the reference voltages for each input capacitor in a CDAC. For example, each input capacitor may be allocated a high-reference capacitor and a low-reference capacitor to provide the reference voltage to the respective input capacitor. Each of these reference capacitors is charged along with the input capacitor when the CDAC is configured into a loading configuration, and then used to convert digital data to an analog signal when the CDAC is configured into a conversion configuration. Accordingly, the reference voltage for each input capacitor is provided by a separate power source. This contrasts with current solutions in which the reference voltages for the input capacitors are provided by either a singular high-reference voltage source or low-reference voltage source.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.