Double-point modulator with accurate and fast gain calibration
US8884709B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 2012 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Sep 12, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/0908
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-locked loop double-point modulator may include a frequency divider having a ratio which can be changed by a first modulation signal, and an oscillator, a frequency of which can be changed by a second modulation signal correlated to the first modulation signal. A calibration circuit may be configured, in a calibration mode, to match the gains of the first and second modulation signals based on frequency measurements of the oscillator for two different calibration values of the second modulation signal. The phase-locked double-point modulator may also include an attenuator having a constant ratio greater than 1 and placed in the path of the second modulation signal, and a selector switch configured to be controlled by the calibration circuit to reduce the ratio of the attenuator in the calibration mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.