Frequency synthesizer with automatic tuning control to increase tuning range
US7019595B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 2003 |
| Grant date | Mar 28, 2006 |
| Priority date | — |
| Expiry date | Dec 27, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A phase control loop circuit for tuning to a reference frequency signal having a phase lock loop (PLL) circuit being responsive to a reference frequency signal having a reference frequency, said PLL circuit including a voltage control oscillator (VCO) for generating a VCO output, said PLL circuit for generating a PLL output, said phase control loop circuit processing said VCO output to generate an output frequency signal having an output frequency, in accordance with an embodiment of the present invention. The phase control loop circuit further includes a coarse tuning circuit being coupled to said PLL circuit, said coarse tuning circuit being responsive to said PLL output for processing the same to generate a counter output, said VCO being responsive to said counter output, said counter output for coarse tuning said output frequency signal to said reference frequency signal, said coarse tuning circuit further responsive to a lock detection (LD) signal, said LD signal for controlling said counter output to cause said output frequency to be within a predetermined range of frequencies including said reference frequency, said PLL circuit for fine tuning said output frequency signal to…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.