Multi-bit output DDS with real time delta sigma modulation look up from memory
US6774832B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 25, 2003 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | Mar 25, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/0321
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A direct digital synthesizer (DDS) generates a sinusoidal waveform having a variable frequency within a time duration. The DDS has a memory for storing pre-computed digital values defining the sinusoidal waveform, a barrel shifter for reading the contents of the memory and for presenting the digital values from the memory to a multiplexer at a first rate determined by a first clock. The multiplexer is connected to a Digital to Analog converter. The Digital to Analog converter converts the digital values presented by the multiplexer to the analog output at a second rate determined by a second clock. The barrel shifter shifts the digital values using a plurality of pipelines and n-bit wrap-around registers. Pre-computed digital values defining the sinusoidal waveform are stored within a memory, then routed using a bus exchange switch to the barrel shifter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.