Circuit and method for capacitor effective series resistance measurement
US7898268B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2008 |
| Grant date | Mar 1, 2011 |
| Priority date | — |
| Expiry date | Jan 21, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit and method for capacitor effective series resistance measurement. One embodiment provides a method for measuring the effective series resistance of a capacitor having a capacitor voltage. The method includes amplifying the capacitor voltage with an AC coupled amplifier yielding a first amplified signal. The capacitor is discharged with a constant current for a measurement time thus causing a voltage swing of the capacitor voltage due to a voltage drop across the effective series resistance. The capacitor voltage is amplified with the AC coupled amplifier yielding a second amplified signal being dependent on the voltage swing. The effective series resistance is calculated from the first and the second amplified signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.