Hybrid frequency synthesizer and method
US9397675B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2015 |
| Grant date | Jul 19, 2016 |
| Priority date | — |
| Expiry date | Jul 31, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M3/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Embodiments include a hybrid frequency synthesizer comprising a direct digital synthesizer configured to generate a digital output signal having a frequency determined by an input signal received from an externally-generated signal source. The hybrid frequency synthesizer further includes a delta sigma modulator configured to generate a delta-sigma modulated signal based on the digital output signal, the delta sigma modulator being coupled to the direct digital synthesizer. The hybrid frequency synthesizer also includes a digital-to-analog converter configured to convert the delta-sigma modulated signal into an analog output signal, the digital-to-analog converter being coupled to the delta-sigma modulator. Moreover, the hybrid frequency synthesizer includes a bandpass filter configured to remove interference frequencies from the analog output signal, the bandpass filter being coupled to the digital-to-analog converter; and a phase locked loop coupled to the band pass filter and driven by a reference signal received therefrom.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.