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This paper presents a methodology to reduce the power consumption, by using multiple supply voltage levels. The voltage levels are scaled down from a single supply voltage, by the use of a diode-connected device. Only one single device is used per conversion, which gives a small area overhead. No inductors and no off-chip components are used. The methodology is tested on different constellations of...
This work presents a rad-hard 4-bit 10MHz Flash ADC for space applications. The converter has been developed using rad-hardened techniques both at architecture and layout levels. The design takes into account the different effects of the radiation that could damage the circuits in harsh environments. The ADC has been integrated in a standard CMOS 0.18-μm technology by TowerJazz. The prototype has...
A new variant of Class-EF power amplifier (PA), the so-called third-harmonic-peaking Class-EF, is presented. It inherits a soft-switching operation from the Class-E PA and a low peak switch voltage from the Class-F PA. More importantly, the new topology allows operations at higher frequencies and permits deployment of large transistors which is normally prohibited since they are always accompanied...
This paper presents a 1–6-GHz scalable microradio receiver unit that can be used in radiation pattern measurement. With no mechanical movement or manual adjustment, the measuring environment with the scalable microradio receiver substantially enhances the degrees of freedom and reduces the cost and time in radiation pattern measurement. Implemented in a 90-nm CMOS technology supporting a 1–6-GHz frequency...
We propose a Digial-to-Time Converter (DTC) that is capable of providing infinite-delay-over-time for application in low-jitter digital phase locked loops. The DTC is implemented using phase interpolation of quadrature phase high-speed clock signals with weight coefficients generated by direct digital synthesis. Novelty of the architecture lies in using (i) a slow-settling current steering DAC that...
Nonlinear vibration energy harvesting is becoming a technology more and more important. Generally vibrations are spread over hundreds or thousands of hertz, making impractical the use of tuned systems. Real world vibrations are even not constant in amplitude, and this makes hard to design a high efficiency electrical energy rectifier and regulator due to the non constant RMS value of the input energy...
In this work, a novel resonator consisting of two detachable mass-springs has been developed. Fitting analysis shows that a corresponding mathematical model exhibits quantitative similarity between the simulation results and experimental data. Simulation results show that an electromagnetic energy harvester using the proposed resonator also has a improved electromechanical conversion efficiency compared...
Technology and market evolutions in smart-systems call for a new design paradigm which is focused on the integration of the development processes in the various engineering disciplines through timely exchange of models, tuned to the specific needs of the different users. According to the vision of the SMAC consortium, these models should be generated automatically through appropriate abstraction flows...
A comparison study between single and differential — UWB — antenna approach for body area network (BAN) applications is proposed in this paper. For compactness reasons, the antennas are studied in order to be integrated on a chip packaging (QFN64 package). In addition, a special attention has been given to design antennas with main polarization normal to the human head. Two antennas structure has...
It has been shown that the transfer function trajectories (TFT) approach allows the automated extraction of compact behavioral models for analog and mixed-signal circuit blocks. The models consist in the concatenation of a multiple-input-multiple-output (MIMO) linear filtering stage and a nonlinear scheduling stage, ensuring a very broad coverage for the method. Models that are generated with the...
We propose a single-slope ADC with an intermittent operational time-to-digital converter (TDC). Applying an n-bit TDC that uses a multi-phase-clock signal reduced the conversion time by a factor of 2", achieved timing consistency, and realized robust meta-stability. However, since a TDC needs to operate continuously, it required a large dissipation power. In this study, we focus on generating...
A well-known limitation of sigma delta modulators is the generation of limit cycle oscillations for DC and slow varying inputs. These limit cycles give rise to undesired tones at the output of the modulator which result in the deterioration of the signal to noise ratio (SNR). However, the use of high dither signal amplitude results in raising the in-band noise floor level. Based on the analysis presented...
LDPC codes are currently the most promising coding technique to achieve the Shannon capacity, making them very popular in modern telecommuncation applications. Despite the attractivity stemming from their effectiveness, encoding and decoding LDPC codes is a rather complex task, due to the size and structure of the codes, especially when considering the ever increasing need for higher throughput in...
There are two main families of charge pumps: parallel and stacking. In this paper, we propose to compare a design that is a combination of both with the more common parallel structure. Its main advantage is to make use of only low voltage capacitors as, for a stacking architecture but without its drawback. The hereafter detailed model shows that with the same capacitors the proposed structure would...
This paper presents an IR-UWB receiver robustly detecting pulses w.r.t. in-band and out-of-band non-pulsed narrowband signals. The system cross-filters the baseband pulse detector output with two different transfer functions to detect fast UWB signals phase advance. The baseband output is indeed low-pass filtered and dynamically subtracted with incoming UWB pulses which have larger bandwidth occupation,...
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