Frequency converter and radio communications system employing the same
US6724804B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1999 |
| Grant date | Apr 20, 2004 |
| Priority date | — |
| Expiry date | Jul 12, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/707
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a frequency converter, a phase-locked loop generates a local-oscillation signal having a low frequency, of a plurality of local-oscillation signals having different frequencies, based on an intermediate frequency beacon signal that results from mixing a predetermined beacon signal with the local-oscillation frequency signal. Even if the phase-locked loop is used to generate the low frequency local-oscillation signal only, a frequency offset and a phase noise taking place in remaining high frequency local-oscillation signals are compensated for or canceled out. The frequency converter thus results in a high frequency accuracy. This arrangement reduces the number of bulky, costly and power-consuming phase-locked oscillators, typically used in the quasi millimeter band or the millimeter band. A simplified, compact frequency converter is thus provided, reducing both installation and operating costs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.