Continuously tuneable frequency steerable frequency synthesizer having frequency lock for precision synthesis
US5266907A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 9, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Oct 9, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D13/004
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A frequency locked loop frequency synthesizer is comprised of a loop including a voltage controlled oscillator, a phase lock locked loop frequency detector, a divide by N counter and a low pass loop filter. A steering voltage is applied to the loop filter to produce a desired frequency or frequencies. The frequency lock loop frequency synthesizer drives the voltage controlled oscillator frequency to be N times the reference frequency. The frequency lock loop synthesizer inherently has 90 degrees less loop phase shift than a conventional phase lock loop. Additionally, the frequency lock loop frequency synthesizer provides a highly accurate, continuously tuneable, frequency synthesizer that includes a linear frequency detector in the frequency lock loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.