Frequency synthesizer utilizing phase shifted control signals
US6317006A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Jul 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/30
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitance in conjunction with a continuously variable capacitance. The discretely variable capacitance may provide coarse tuning adjustment of the variable capacitance to compensate for capacitor and inductor tolerances and to adjust the output frequency to be near the desired frequency output. The continuously variable capacitance may provide a fine tuning adjustment of the variable capacitance to focus the output frequency to match precisely the desired frequency output. During fine tuning adjustment, the PLL may be controlled by a plurality of analog control signals. The analog control signals may be derived by first generating a plurality of phase shifted signals from a divided version of the VCO output clock by using a shift register. The shift register may be clocked by another clock signal at a higher frequency than the divided version of the VCO output clock. The phase differences between the plurality of phase shifted s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.