Phase-locked loop with memory storing control data controlling the oscillation frequency
US5355098A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 22, 1993 |
| Grant date | Oct 11, 1994 |
| Priority date | — |
| Expiry date | Apr 22, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/189
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase-locked loop with memory storing control data. The control data to be given to a voltage-controlled oscillator in a phase-locked loop is addressed in accordance with an oscillation condition including the frequency of a reference signal, a dividing ratio of the frequency divider and ambient air temperature. When the phase-locked loop is controlled off, the control voltage for the voltage-controlled oscillator is changed into digital data by an analog-to-digital converter to be transferred to the memory. The digital data or control data is read out from the memory when the phase-locked loop is controlled on. The control data is then changed into analog equivalent as control voltage supplied to the voltage-controlled oscillator, shortening the locking-up time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.