Automatic selection of an operating frequency in a low-gain broadband phase lock loop system
US5382921A · kind A · utility
47Cited by
12References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 23, 1992 |
| Grant date | Jan 17, 1995 |
| Priority date | — |
| Expiry date | Nov 23, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0997
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A broadband low-gain system for automatically frequency-locking a signal where the system uses digital and analog devices and techniques. The system includes a comparator, an up/down counter, a digital-to-analog converter, a decoder, a ring oscillator and a downcounter. The digital control signal is provided by the decoder and actuates one of a plurality of ring oscillator stages. The analog control signal is provided by the digital-to analog-converter and controls a fine-tune mechanism in the actuated stage. The system includes a master reset for clearing the counters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.