Wide range drift compensated FM signal generator
US4286237A · kind A · utility
11Cited by
8References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 18, 1979 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | Oct 18, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/09
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The output frequency of a variable frequency oscillator is compared with that of a reference frequency source by means of a phase detector and the resultant error signal is integrated and applied as a negative feedback signal to the input of the oscillator whereby drift of the oscillator output frequency is minimized. Deviation, modulation index, dynamic stability and linearity are enhanced by means of a pulse generator that is synchronized with a modulating input signal supplied to the oscillator for supplying a keying signal to the phase detector during a portion of each cycle of the modulating input signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.