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This paper describes a linearized RF front-end design consisting of a subthreshold pseudo-differential common-source cascode low-noise amplifier (LNA) and a subthreshold active mixer. The applied linearization mechanisms can improve the third-order intermodulation intercept point (IIP3) without additional power consumption by using only passive components, which implies that the techniques do not...
Installing wireless Intelligent Electronic Devices (IED) for Substation Automation (SA) requires a thorough study of the electromagnetic radiations coming from the power equipment. In our previous work, we have performed a measurement campaign within several substations working under different voltages and we have recorded around 120 sequences of impulsive noise samples in the 700 MHz–2.5 GHz band...
A high efficiency, low-complexity, low-cost rectifier for low-power density and low-power input is analyzed, fabricated and measured. The design consists of a double diode rectifier with operation in the two frequency bands of 900 MHz ISM and FM, simultaneously. Although the design uses a low-cost, lossy FR-4 substrate and a low-complexity rectifier circuit, the RF-to-DC rectification efficiency achieves...
In this demo, we propose Phone meter which leverages the RF energy harvesting technologies to measure the strength of Electromagnetic Field (EMF). To this end, Phone meter combines EMF sensor with the smartphone through audio interface without any modifications to the phone. We fully implement the low-cost Phone meter and conduct extensive experiments to prove the functionality of Phone meter. Phone...
This paper proposes an advanced system for process management via a credit card sized single board computer called raspberry pi based multi parameter monitoring hardware system designed using RS232 and microcontroller that measures and controls various global parameters. The system comprises of a single master and multiple slaves with wireless mode of communication and a raspberry pi system that can...
In this paper a source-pull approach is followed to optimize RF-DC converter efficiency in Wireless Power Transmission/Wireless harvesters systems. This approach is applied to simple one stage RF/DC rectifier but also to a voltage multiplier in a Dickson charge pump configuration. The optimization process was made in two scenarios, while in the first case it was used to maximize the efficiency of...
A wide-band 900 MHz to 2.45 GHz rectenna has been developed for Radio Frequency (RF) energy harvesting in the context of outdoors Wireless Sensor Nodes (WSN). Based on simulations of different rectifying circuits, the most appropriate one for low incident power levels has been manufactured and tested with a wide-band antenna. The theoretical analysis, confirmed by measurements, shows that the proposed...
This paper presents a low-power voltage regulator for wireless sensor nodes. The circuit, implemented in a 90 nm CMOS process, generates a process-temperature-voltage independent 0.5 V while only consuming 26 nA. The output voltage variation is within 27 mV when power supply changes from 1 to 2 V and can provide a 15 μA load current. A fast settling technique is employed to improve the startup response...
Recent advances in ultra-low-power circuits and energy harvesters are making self-powered body wireless autonomous transducer solutions (WATS) a reality. Power optimization at the system and application level is crucial in achieving ultra-low-power consumption for the entire system. This paper deals with innovative WATS modeling techniques, and illustrates their impact on the case of autonomous wireless...
This paper presents a scheme of modeling radio frequency (RF) power amplifier (PAs) for 3-port applications by including modeling of bias port of PA along with its input and output ports. This scheme uses polynomials with infinite impulse response (IIR) bases functions for modeling non-linear behavior of PA as well as its short and long term memory effects. Power amplifiers designed for third generation...
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