Charge-injection SAR ADC for correcting full scale PVT variation
US12413237B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | Jan 9, 2024 |
| Grant date | Sep 9, 2025 |
| Priority date | — |
| Expiry date | Jun 13, 2044 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/466
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A charge-injection SAR ADC device has a modified charge-injection cell (CIC), and a complementary to absolute temperature (CTAT) circuit for generating a bias voltage. The CIC and CTAT circuits cooperate to correct for process, voltage, and temperature (PVT) variation that affect SAR ADC input full scale. The CIC has been modified to have transistors that are in a cascoded relationship with transistors operating to maintain a reservoir of charge. The CTAT circuit is designed to substantially replicate the CIC, and it tracks the CIC operation to correct variations in transistor threshold voltage due to variations in PVT.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.