Abstract
This paper presents the design of low power modulator and demodulator circuits dedicated to a BFSK transceiver, operating in the 863- 870 MHZ ISM band. The two circuits were designed using ams 0.35µm technology with 3V dc voltage supply. Simulation results of the new Direct Digital Frequency Synthesizer in the modulation have shown good performances of the designed system as the Spurious Free Dynamic Range SFDR reached -88 dBc while the circuit consumes only 47.7 µW @ 43.3MHz. The demodulator has also presented a good BER of 10-3 @10.9 EbtoN0 and a sensitivity of about -115 dBm.
Highlights
The low-power market has experienced explosive growth over the past ten years by the presence of new wireless command and control technologies
Several standards have been studying the implementation of wireless sensor network, such as the ultra wideband UWB (IEEE 802.15.3) standard [2], Bluetooth (IEEE 802.15.1), but mostly the standard Zigbee (IEEE 802.15.4) that is dedicated to the wireless networks of the family WPAN LR (Low Rate Wireless Personal Area Network) [3]
A new architecture of the Direct Digital Frequency Synthesizer (DDFS) with small lookup table for the sine and cosine functions and pipelined phase accumulators was put into test
Summary
The low-power market has experienced explosive growth over the past ten years by the presence of new wireless command and control technologies. This expansion is provided by the technology of wireless sensor networks of low range, which has many applications including home automation, industrial and commercial automation, peripherals for personal computers and medical survey and health care monitoring. The requirement for vital sign monitoring has significantly increased as population aging is rapidly progressing in many industrialized countries. This grow-up is accompanied by an even more dramatic increase in the number of old people suffering from chronic diseases and disabilities as specified in [1].
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