The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 03, 2008
Filed:
Mar. 04, 2005
Michael H. Thomas, Seattle, WA (US);
Scott Anthony Cooper, Seattle, WA (US);
Aanand Esterberg, Seattle, WA (US);
Michael H. Thomas, Seattle, WA (US);
Scott Anthony Cooper, Seattle, WA (US);
Aanand Esterberg, Seattle, WA (US);
Impinj, Inc., Seattle, WA (US);
Abstract
A transmitter shifts a baseband data signal having a bandwidth of 2ωusing a tone signal having a frequency ω, 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 ωequal 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 ω. The transmitter has a single RF oscillator to output both a SSB signal centered at frequency ωduring the first mode and a carrier signal of frequency ωduring the second mode.