Frequency detection circuit and method
US11327098B2 · kind B2 · utility
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4References
9Claims
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Key dates
| Filing date | Nov 3, 2020 |
| Grant date | May 10, 2022 |
| Priority date | — |
| Expiry date | Nov 20, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R35/00
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
During frequency detection, a constant current source outputs an output current to charge a variable capacitor for multi-period. In a calibration mode, according to a comparison result between a cross voltage of the variable capacitor and a reference voltage, a capacitance value of the variable capacitor is adjusted. In a monitor mode, according to a reference frequency and the cross voltage of the variable capacitor, a frequency under test of a circuit under test is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.