Techniques for synchronizing a self oscillating variable frequency modulator to an external clock
US6297693A · kind A · utility
15Cited by
11References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 23, 1999 |
| Grant date | Oct 2, 2001 |
| Priority date | — |
| Expiry date | Dec 23, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/3241
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The frequency spectrum of variable frequency class D modulator interferes with RF signals in the AM bandwidth. Here several techniques solve the problem including an amplifier that synchronizes an external clock input the summing node of the integrator, an amplifier that gates an external clock to the modulator using a transmission gate that responds to the AM frequency, and an amplifier that adjusts its own hysteresis to provide a clock that does not interfere with AM input signals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.