Laboratory of Micro Electro Thermal Systems METS

Tunisia

Laboratory of Micro Electro Thermal Systems METS

Tunisia

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Trabelsi H.,University of Sfax | Trabelsi H.,Laboratory of Micro Electro Thermal Systems METS | Barraj I.,Laboratory of Micro Electro Thermal Systems METS | Masmoudi M.,Laboratory of Micro Electro Thermal Systems METS
AEU - International Journal of Electronics and Communications | Year: 2014

A dual band frequency-shift keying (FSK) transmitter for low data rate, short range application, operating in the 3-5 GHz ultra-wideband is described in this paper. Chirped signal with FSK modulation enables direct conversion technique which simplifies the transceiver architecture. Two sub-band frequencies are used to encode the binary data employing chirped pulse generator. The front-end consists of an RF fast startup LCVCO, a ramp signal generator and a differential wideband resistive feedback power amplifier. All circuits are designed in 0.18 μm CMOS. The ramp generator produces linear rising ramp and can maintain a constant chirp range across PVT variation. The simulated chirp pulses show a Vppof 0.26 V. The differential power amplifier achieves a P-1dB of 4.4dBm. It realizes a flat gain of 10.27 ± 0.03 dB across the dual band spectrum and a NF less than 2dB. The transmitter maximum output power is in the -10.077 to -10.15dBm range. The ramp generator, the pulse generator and the power amplifier consume currents of 0.95 mA, 1.6 mA and 7.5 mA respectively. The simulated PSD at the output of the transmitter meets FCC spectral mask requirement and the 500 MHz bandwidth constrain. The transmitter achieves energy efficiency of 0.6 nJ/bit at a data rate up to 3.2 Mbps. © 2014 Elsevier GmbH.


Barraj I.,University of Sfax | Barraj I.,Laboratory of Micro Electro Thermal Systems METS | Trabelsi H.,Laboratory of Micro Electro Thermal Systems METS | Rahajandraibe W.,CNR Institute of Neuroscience | Masmoudi M.,Laboratory of Micro Electro Thermal Systems METS
BioNanoScience | Year: 2015

The design of an energy-efficient tunable ultra-wideband (UWB) pulse generator which complies with FCC regulations, without the need for shaping filter, is presented. The proposed pulse generator is based on carrier architecture. A new baseband UWB wavelet is used to modulate digital input data, ensuring better spectral efficiency. By using digital implementation technique, the proposed UWB pulse generator can adjust both the pulse width and the pulse amplitude, allowing more flexibility for use with different UWB technique. The design was simulated by a standard 65-nm CMOS technology. Simulation results show that the consumed energy by pulse is 19.8pJ decreased proportionally as bandwidth spectrum is higher. This shows a very good agreement with the low-power, low-cost UWB systems. The tuning spectrum complies with 3.1–5 GHz regulations. © 2015, Springer Science+Business Media New York.

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