VFO having plural feedback loops
US4286235A · kind A · utility
4Cited by
9References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 25, 1979 |
| Grant date | Aug 25, 1981 |
| Priority date | — |
| Expiry date | Jun 25, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03C3/42
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator including a resonator having a primary feedback loop for causing oscillations to occur at a desired frequency and a secondary feedback loop including a multiplier for causing variations of said frequency in response to an input signal manifestation. Spectral purity is enhanced and potential overtone oscillations are suppressed by a cascade connection of lag networks in the primary loop which exhibit a low-pass transfer characteristic and provide at least .pi. radians of phase shift, one of the networks being shared in common with the secondary loop for supplying a quadrature signal to the multiplier.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.