Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Volume 65, Issue 2, Pages 374-385Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMTT.2016.2645568
Keywords
Body sensor networks; CMOS; frequency division multiplexing (FDMA); frequency modulation; Internet of Things; personal area networks; radio transceivers; ultrawideband communication (UWB); wireless communication; wireless sensor networks (WSNs)
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Funding
- Swiss National Science Foundation through Nano-Tera National Research Program [20NA21-143070]
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A low-power frequency modulated-ultra-wideband (FM-UWB) receiver for short-range communications, capable of simultaneously demodulating multiple FM-UWB signals located at the same frequency, is presented in this paper. The proposed receiver utilizes an approximate zero IF architecture that uses a low-power, free-running ring oscillator as the RF LO to first convert the input signal into baseband, where it is then amplified and demodulated. Moving the most power-hungry blocks from RF to IF results in reduction of power consumption by more than one order of magnitude compared to previous implementations using the delay-line demodulator. Integrated in a 65-nm CMOS technology, the whole receiver chain consumes 423 mu W from a 1-V supply while achieving -70-dBm sensitivity at a data rate of 100 kb/s at 4 GHz. Communication with up to four FM-UWB users, operating in the same band, is demonstrated, making this receiver suitable for high-density wireless sensor networks.
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