True RMS power measurement
US8373487B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 29, 2011 |
| Grant date | Feb 12, 2013 |
| Priority date | — |
| Expiry date | Aug 29, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R21/01
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Systems and methods are provided for power measurement of signals such that the power measurement is insensitive to PVT variations of the measurement systems. A power measurement system includes an analog squarer circuitry, an integrating ADC, and a controller. The squarer circuitry calculates the power of a signal whose power is to be measured while the integrating ADC integrates the calculated power over a runup interval to generate an integrated power. The squarer circuitry also calculates the power of a reference for the integrating ADC to de-integrate the integrated power over a rundown interval. The power measurements are independent of PVT variations of the analog squarer circuitry and integrating ADC. The controller digitally controls the runup interval and measures the rundown interval to provide digitized power measurements. The analog squarer circuitry have replica squarer circuits. Process dependent mismatches between the replica analog circuitry may be removed through a calibration process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.