Dynamic voltage reference for delta-sigma analog-to-digital converter (ADC) with temperature trim calibration
US11502700B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 18, 2021 |
| Grant date | Nov 15, 2022 |
| Priority date | — |
| Expiry date | Mar 18, 2041 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/432
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A calibratable switched-capacitor voltage reference and an associated calibration method are described. The voltage reference includes dynamic diode elements providing diode voltages, input capacitor(s) for sampling input voltages, base-emitter capacitor(s) for sampling one diode voltage with respect to a ground, dynamically trimmable capacitor(s) for sampling the one diode voltage with respect to another diode voltage, and an operational amplifier coupled to the capacitors for providing reference voltage(s) based on the sampled input and diode voltages and on trims of the trimmable capacitor(s). The voltage reference can be configured as a first integrator of a modulator stage of a delta-sigma analog-to-digital converter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.