Method for reducing direct digital synthesizer (DDS) and mixer spurious
US10623031B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 2018 |
| Grant date | Apr 14, 2020 |
| Priority date | — |
| Expiry date | Oct 11, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/1806
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method of producing a low spurious output signal in a frequency generator circuit comprises, in a direct digital synthesizer (DDS), generating a signal at a first frequency; mixing the signal to produce a signal at a second frequency in an operating band of interest higher than the first frequency; determining spurious signals in the second frequency signal due to non-linearity in a digital to analog converter (DAC) of the DDS; generating at least one amplitude and frequency vector containing information relating to an amplitude value and frequency value representative of one of the determined spurious energy signals; generating a pre-distortion signal based on the at least one amplitude and frequency vector; and combining the pre-distortion signal with the signal generated by the DDS to produce a corrected output signal, wherein the pre-distortion signal is phase offset from a corresponding determined spurious signal to cancel the corresponding determined spurious signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.