Single RF oscillator single-side band modulation for RFID readers with frequency translation and filtering
US7382257B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 4, 2005 |
| Grant date | Jun 3, 2008 |
| Priority date | — |
| Expiry date | Jan 18, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K7/0008
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A transmitter shifts a baseband data signal having a bandwidth of 2ωM using a tone signal having a frequency ωM, which centers a sideband of the data signal at zero frequency. The transmitter then filters the shifted signal to filter out the non-centered sideband, and then adds the tone signal to form a composite signal. The transmitter upconverts the composite signal during a first operational mode using a RF signal having a frequency ωC equal to a center frequency of a channel. In a second operational mode, the transmitter upconverts a DC level using the same RF signal. The upconverted DC level can be used as a continuous wave carrier signal having a frequency ωC. The transmitter has a single RF oscillator to output both a SSB signal centered at frequency ωC during the first mode and a carrier signal of frequency ωC during the second mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.