System for calibrating analog-to-digital converter
US5621406A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1994 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Sep 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M1/60
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A calibrating system calibrates an analog-to-digital converter which has an integrator and first and second reference current sources. A quantity of charge is accumulated in the integrator. The quantity of charge is removed from the integrator by applying the first and second reference currents to the integrator for first and second time periods until the accumulated charge reaches a threshold level. The quantity of charge is reaccumulated in the integrator and again removed by applying the first and second reference currents for third and fourth time periods wherein the first and second time periods are different from the third and fourth time periods. The relative magnitude of the first and second reference currents is determined based on the first, second, third and fourth time periods.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.