Injection locked ring oscillator circuit with an analog quadrature calibration loop
US9444435B1 · kind B1 · utility
9Cited by
0References
19Claims
0Family size
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Key dates
| Filing date | Oct 20, 2015 |
| Grant date | Sep 13, 2016 |
| Priority date | — |
| Expiry date | Oct 20, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0322
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A ring oscillator includes a first delay stage generating a first phase signal and a second delay stage generating a second phase signal. Each of the first and second delay stages includes variable resistance circuit. A phase comparator circuit performs a phase comparison between the first and second phase signals to generate a phase error signal. An amplifier circuit generates a control signal from the phase error signal. A feedback loop applies the control signal to control the resistance of the variable resistance circuits in the first and second delay stages.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.