Title:
２点ＦＳＫ変調を用いた周波数シンセサイザを校正する方法
Document Type and Number:
Japanese Patent JP6267767
Kind Code:
B2
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.
Inventors:
Arnaud Casagrand
Application Number:
JP2016199721A
Publication Date:
January 24, 2018
Filing Date:
October 11, 2016
Export Citation:
Assignee:
The Swatch Group Research and Development Limited
International Classes:
H03L7/197; H03L7/08; H04B17/17; H04B17/19; H04B17/29; H04L27/14
Domestic Patent References:
| JP2016500956A | ||||
| JP2005072874A | ||||
| JP2010093808A |
Foreign References:
| WO2014059291A1 | ||||
| US20080007346 | ||||
| US20090219100 |
Attorney, Agent or Firm:
Shigeki Yamakawa
Masaki Yamakawa
Masaki Yamakawa