Control circuit for establishing voltage-controlled or injection-locked operation of a synthesizer reference oscillator
US4247834A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 1979 |
| Grant date | Jan 27, 1981 |
| Priority date | — |
| Expiry date | Feb 15, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/24
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
In a synthesizer system having a reference oscillator selectively operable in either a voltage-controlled or an injection-locked mode, a circuit for effecting the appropriate mode of operation. The circuit includes an analog gate coupled between the output of a crystal oscillator and the input of the reference oscillator. The analog gate is driven by a logic element responsive to a plurality of signals indicative of specific operating conditions. In particular, the circuit assures that the reference oscillator is coupled to the crystal oscillator, that is, the reference oscillator operates in the injection locked mode, while the synthesizer PLL achieves acquisition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.