Impact of the Local Oscillator on Baseband Processing in RFID Transponder

The ultra high frequency (UHF) passive radio frequency identification (RFID) technology has gained popularity, because there are improvements regarding read distance and operational reliability. This features and the low-cost passive technology suppose to play an important role in the field of automatic identification and ubiquitous computing. The operation frequency of the UHF transponder (tag) is between 860 MHz-960 MHz. The performance of the tag is limited by physical reasons such as available power for the baseband processing. The baseband functions are specified in EPCtrade class 1 generation 2 UHF protocol, in which a local oscillator generates the clock for the baseband processor. This paper analyzes the influence of the local oscillator to the communication in the baseband.