Multi-phase triangular wave synthesizer for phase-to-frequency converter
US5646967A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 9, 1996 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | May 9, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/08
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A triangular waveform synthesizer for a phase-to-frequency converter generates a saw tooth and triangular wave using both PDM and a DC modulation scheme. To minimize both delay and logic, while continuing to provide reasonable resolution, a 4-bit PDM and associated logic generates the PDM output waveform with polarity information and two switching waveforms that encode the DC level information to provide a resultant sum. The resulting waveform, after filtering, is the triangular waveform. Since the switching and adding of the DC levels occurs in real time, the actual delay for the resultant triangular wave is only that of the 4-bit PDM.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.