Method and device for measuring resistance
US7250777B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 28, 2006 |
| Grant date | Jul 31, 2007 |
| Priority date | — |
| Expiry date | Mar 28, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01K13/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for measuring a resistance includes a comparator. A D-type flip-flop has its D input connected to the output of the comparator and its latch input connected for receiving a pulse signal at a fixed pulse repetition rate. A reference voltage source is connected to a first of the inputs of the comparator and an integrator is coupled between an output of the flip-flop and the second of the two inputs of the comparator. The integrator includes a resistor whereby the integrator develops a voltage at the second input of the comparator that depends on the pulse repetition rate and on the resistance of the resistor. The comparator, the integrator and the flip-flop are connected in a negative feedback loop such that at steady state the voltage developed by the integrator at the second input of the comparator is substantially equal to the reference voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.