Super-regenerative Receiver for UWB-FM

Super-regenerative - 1 Super-regenerative Receiver for UWB-FM Rui Hou Nitz Saputra and John R Long Electronic Research Laboratory Faculty of EEMCS

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Super-regenerative Receiver for UWB-FM Rui Hou, Nitz Saputra and John R. Long Electronic Research Laboratory, Faculty of EEMCS, Delft University of Technology Mekelweg 4, Room 18.280, 2628 CD Delft, the Netherlands Phone: +31 (0)15 2782006, Email: [email protected] Abstract —UWB-FM is a low-complexity ultra-wideband (UWB) communication system designed for short-range, low- data-rate wireless applications. A fully integrated super- regenerative receiver in IBM 90-nm RF CMOS technology is designed to detect 500 MHz bandwidth UWB-FM signals at 4.5 GHz. Circuit simulations show that a receiver sensitivity of -82.2 dB is attainable for a 100 kbps baseband data-rate and 10 - 6 potential bit-error-rate. The whole receiver draws an average of 2 mA from a 0.9 V supply. Index Terms —low-power, super-regenerative receiver, UWB- FM I. INTRODUCTION The recent advance of short-range communication tech- nologies such as personal area networks (PAN) and wireless sensor networks (WSN) create immense application possibil- ities, ranging from clinical diagnosis to wildlife monitoring. These applications require simple receivers with low power- consumption, since consumer products with bulky batteries are unattractive and field deployment of ephemeral sensors is unacceptable. UWB-FM [1] is a low-power low-complexity ultra- wideband (UWB) modulation scheme designed for short- range, low-data-rate PAN and WSN applications. It utilizes the wideband frequency modulation (WBFM) to spread the spectrum of a continuous carrier over a large bandwidth. Compared with narrow-band modulation schemes such as on- off keying (OOK), UWB-FM offers low-cost wireless links since the spectrum licensing fee is avoided. Furthermore, the continuous carrier mitigates the necessity of synchronization, so that the complexity and power consumption of receivers are reduced. Previous work utilizes delay-line demodulators for UWB-FM detection. The reported power consumption is between 10 to 20 mW [2], [3]. The goal of this research is to further reduce the power consumption of a UWB-FM receiver by exploiting the super-regeneration principle [4]. Employing positive feedback, super-regenerative receivers operate in an intermittent oscil- latory condition. Oscillations are periodically built up from weak RF excitations and then quenched to avoid amplification saturation. In doing so, a huge amount of gain can be obtained by a single stage. Typically, super-regenerative receivers have been designed for simple narrow-band modulation schemes such as OOK [5]– [10], providing that proper measures [11] are taken to improve the poor selectivity and inherent frequency instability. Occa- sionally, they were also used to detect spread spectrum [12], [13] and pulse based UWB signals [14]–[16], benefiting from 0 1 2 3 4 5 6 -1 0 1 Baseband d(t) Time (us) Amplitude (V) 0 1 2 3 4 5 6 -1 0 1 Subcarrier m(t) Time (us) 0 1 2 3 4 5 6 -1 0 1 RF carrier v(t) Time (us) 4 4.2 4.4 4.6 4.8 5 -50 -45 -40 RF Power Spectrum Frequency (GHz) PSD (dBm/MHz) Figure 1. The time-domain waveforms of the baseband data, subcarrier, RF UWB-FM signal and its spectrum.
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This note was uploaded on 05/11/2011 for the course ELECTRONIC 005 taught by Professor Haghbin during the Spring '10 term at Sharif University of Technology.

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Super-regenerative - 1 Super-regenerative Receiver for UWB-FM Rui Hou Nitz Saputra and John R Long Electronic Research Laboratory Faculty of EEMCS

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