Digital phase-locked loop circuit
US4418318A · kind A · utility
20Cited by
8References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 10, 1981 |
| Grant date | Nov 29, 1983 |
| Priority date | — |
| Expiry date | Mar 10, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/0992
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A digital phase-locked loop consisting of a digital phase detector for detecting the phase differences between the output and the input frequency signals, a microprocessor programmed to perform both the functions of the loop filter and the phase shifter, and a binary rate multiplier to perform the function of voltage-to-frequency conversion is disclosed. A more precise frequency resolution is obtained by use of the binary rate multiplier and a further reduction in circuit complexity is achieved by removal of the phase shifter circuit in favor of the microprocessor programming.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.