Method for calibrating a frequency synthesiser using two-point FSK modulation
US10003414B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 2016 |
| Grant date | Jun 19, 2018 |
| Priority date | — |
| Expiry date | Nov 8, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F2200/451
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The method for calibrating the frequency synthesizer using two-point FSK modulation consists, in a first phase, in supplying an excitation signal generated by a calibration unit to a sigma-delta modulator by deactivating a digital-to-analog converter and transmitting the output signal from a loop filter of the synthesizer to the calibration unit, which digitally converts the incoming signal and offsets the phase shift between the excitation signal and the loop filter output signal in the calibration unit. In a second phase, the excitation signal is supplied to the sigma-delta modulator and to the activated digital-to-analog converter, and the digital-to-analog converter gain is calibrated by checking, in the calibration unit, the polarity of the loop filter output signal with respect to the excitation signal, and using a dichotomy algorithm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.