Device for the comparison of two resistors, and integrated resistor compensation system incorporating this device
US6791340B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2002 |
| Grant date | Sep 14, 2004 |
| Priority date | — |
| Expiry date | Sep 23, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R17/12
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for the comparison of two resistors is based upon analog information carried by currents. The device includes a measurement circuit for extracting the currents from the two resistors to be compared, and copies the currents to a parallel analog-digital converter that carries out the division of the extracted currents. The device converts the ratio of the extracted currents into a digital code that is the image of the ratio of the two resistors. The ratio is constantly re-updated as a function of environmental parameters of the circuit, such as the operating temperature. Also disclosed is a system for correcting the value of integrated compensated resistors. The system implements a device of this kind that does not use a reference voltage generator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.