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:
Jul. 12, 2011
Filed:
Feb. 18, 2005
Pradeep B. Khannur, Singapore, SG;
Sheng Jau Wong, Singapore, SG;
Aruna B. Ajjikuttira, Singapore, SG;
Jia Jun Zheng, Singapore, SG;
Pradeep B. Khannur, Singapore, SG;
Sheng Jau Wong, Singapore, SG;
Aruna B. Ajjikuttira, Singapore, SG;
Jia Jun Zheng, Singapore, SG;
Agency for Science, Technology and Research, Singapore, SG;
Cyrips Pte Ltd., Singapore, SG;
Abstract
An RFID transceiver () includes a common frequency source (), a receiving channel () and a transmitting channel (). The common frequency source () is configured to provide a predefined intermediate frequency signal f, and a predefined carrier frequency signal f. The RFID receiving channel () includes an upconverting mixer () having a first input coupled to receive the predefined intermediate frequency signal f, a second input coupled to receive the predefined carrier frequency signal f, and an output, the upconverting mixer () operable to produce an upconverted signal at a frequency defined by f±f. The RFID receiving channel () further includes an image rejection downconverting mixer () having a first input coupled to receive an RFID signal having a carrier frequency substantially at the predefined carrier frequency f, a second input coupled to receive the upconverted signal, and an output, the image rejection downconverting mixer () operable to produce an output a downconverted signal at substantially the predefined intermediate frequency f. The RFID transmitting channel () includes a modulator () operable to modulate modulation data onto the predefined carrier frequency signal f.