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An FSK Demodulator Design for RF Wireless Sensor Applications Using Zigbee Protocol

Amel Neifar, Hatem Trabelsi, and Mohamed Masmoudi
National Engineers School of Sfax/ Micro Electro Thermal Systems (METS) Research Group, Sfax, Tunisia
Abstract—In this paper, transistor-level simulations of a detector called “cross-differentiate-multiplier demodulator (CDM)” are presented. This detector, which uses three blocks (a differentiator, a multiplier and a subtractor), is able to demodulate a received bit sequence, that was transmitted using a frequency-shift keying modulation scheme, with a bit rate equal to 20kbps. The application of this detector will be in a wireless sensor receiver operating in the 863-870MHz ISM band. In this sensor, a frequency hopping spread spectrum is used as modulation technology and Zigbee (IEEE 802.15.4) as the communication protocol. Design is performed using 0.35μm CMOS technology and a 3V supply. A comparison between the performances of different architectures studied, mainly in terms of BER, is presented at the end of this document.
 
Index Terms—cross-differentiate-multiplier demodulator, direct conversion receiver, zigbee protocol, wireless communication, BER simulations, 0.35μm CMOS technology

Cite: Amel Neifar, Hatem Trabelsi, and Mohamed Masmoudi, "An FSK Demodulator Design for RF Wireless Sensor Applications Using Zigbee Protocol," International Journal of Electronics and Electrical Engineering, Vol. 3, No. 4, pp. 285-291, August 2015. doi: 10.12720/ijeee.3.4.285-291
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