-
[show abstract]
[hide abstract]
ABSTRACT: Five different Hall Effect sensors were modeled and their performance evaluated using a three dimensional simulator. The physical structure of the implemented sensors reproduces a certain technological fabrication process. Hall voltage, absolute, current-related, voltage-related and power-related sensitivities were obtained for each sensor. The effect of artificial offset was also investigated for cross-like structures. The simulation procedure guides the designer in choosing the Hall cell optimum shape, dimensions and device polarization conditions that would allow the highest performance.
Sensors 01/2013; 13(2):2093-112. · 1.74 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: This paper further examines the use of mixed-signal circuits for power system emulation. It has already been proven that analog emulation overcomes the speed limits of numerical simulators by means of a simple fixed-topology prototype. In order to enhance the modularity and the size of the emulated power system a dedicated platform based on a field programmable power network system (FPPNS) has been developed. This platform contains an application specific integrated circuit as main building block. Details on the designed hardware are given in this paper. Furthermore the emulator is validated comparing its emulation results with numerical reference simulations. The promising results of this platform show that the design of a fully integrated solution containing an array of 100 atoms can be started.
Circuits and Systems (ISCAS), 2011 IEEE International Symposium on; 06/2011
-
18th IEEE International Conference on Electronics, Circuits and Systems, ICECS 2011, Beirut, Lebanon, December 11-14, 2011; 01/2011
-
International Symposium on Circuits and Systems (ISCAS 2011), May 15-19 2011, Rio de Janeiro, Brazil; 01/2011
-
Microelectronics Journal. 01/2010; 41:758-765.
-
Microelectronics Journal. 01/2009; 40:1175-1183.
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a compact- and a macro-model for estimating and simulating the perturbations induced in the substrate by high-voltage transistors switching inductive loads. On one hand, it allows the designer to predict the amount of switching noise generated by a particular topology. On the other hand, it enables a wise choice of the positioning of sensitive low-voltage circuits around the noisy devices, as well as the choice of appropriate shielding structures. The models proposed are validated by measurements on a prototype circuit at 25degC.
Circuits and Systems and TAISA Conference, 2008. NEWCAS-TAISA 2008. 2008 Joint 6th International IEEE Northeast Workshop on; 07/2008
-
[show abstract]
[hide abstract]
ABSTRACT: The main advantage of the current steering technique is the small amount of noise generated during state commutations of logic
gates. However, it presents a steady state consumption, which is considered as a limitation for low power applications when
compared to the conventional static logic.
05/2006: pages 209-232;
-
[show abstract]
[hide abstract]
ABSTRACT: Ever since the invention of the transistor in the late 50’s, its fabrication technology has been evolving, allowing the device
integration in a continuously shrinking area. High-performance integrated analog systems have always been difficult to design.
Sometimes, calibration is used to gather the extra performance that the analog devices cannot provide intrinsically. But the
evolution of the manufacturing technology renders even basic analog systems difficult to design today. With the size reduction,
the intrinsic precision of the components degrades. In parallel, the supply voltage decreases, limiting the topologies which
can be used. Many modern technologies are specifically suited for pure digital circuits, and some analog devices, like capacitors,
are not available. In these conditions, analog design is a challenge even for experienced designers.
01/2006: pages 1-4;
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a new Procedural Analog Design tool called PAD. It is a chart-based design environment dedicated to the design of analog circuits aiming to optimize design and quality by finding good tradeoffs. This interactive tool allows step-by-step design of analog cells by using guidelines for each analog topology. Its interactive interface enables instantaneous visualization of design tradeoffs. At each step, the user modifies interactively one subset of design parameters and observes the effect on other circuit parameters. At the end, an optimized design is ready for simulation (verification and fine-tuning). The present version of PAD covers the design of basic analog structures (one transistor or groups of transistors) and the procedural design of transconductance amplifiers (OTAs) and different operational amplifier topologies. The basic analog structures calculator embedded in PAD uses the complete set of equations of the EKV MOS model, which links the equations for weak and strong inversion in a continuous way [1, 2]. Furthermore, PAD provides a layout generator for matched substructures such as current mirrors, cascode stages and differential pairs.
Analog Integrated Circuits and Signal Processing 02/2005; 42(3):291-299. · 0.59 Impact Factor
-
4th International Symposium on Quality of Electronic Design (ISQED 2003), 24-26 March 2003, San Jose, CA, USA; 01/2003
-
[show abstract]
[hide abstract]
ABSTRACT: A new technique for driving silicon-on-insulator pixel matrixes has been proposed in [1], which was based on transient charge pumping for evacuating the extra photogenerated charges from the body of the transistor. An 8x8 pixel matrix was designed and fabricated using the above technique. In this paper, the measurement set-up is described and the performance evaluation procedure is given, together with results of its implementation on the fabricated pixel matrix. The results show the applicability of the charge pumping technique and the effective operation of the image sensor.
-
[show abstract]
[hide abstract]
ABSTRACT: In centrifugal pumps, the interaction between the rotating impeller and the stationary diffuser generates specific pressure fluctuation patterns. When the pump is operated at off design conditions, these pressure fluctuations increase. The resulting rise of mechanical vibration levels may negatively affect the operational performance and the life span of mechanical components. This paper presents detailed pressure fluctuation measurements performed in a high speed centrifugal pump stage at full scale at various operating conditions. The impeller and stationary part (diffuser, exit chamber) of the pump stage have been equipped with piezo-resistive miniature pressure sensors. The measured data in the impeller have been acquired using a newly developed onboard data acquisition system, designed for rotational speeds up to 6000 rpm. The measurements have been performed synchronously in the rotating and stationary domains. The analysis of pressure fluctuations at the impeller blade trailing edge, which had significantly larger amplitudes as the pressure fluctuations in the stationary domain, allowed the detection and exploration of stalled channels in the vaned diffuser. This stall may be stationary or rotating with different rotational speeds and number of stalled channels, depending on the relative flow rate and the rotational speed of the pump. The stall yields pressure fluctuations at frequencies which are multiples of the rotational speed of the impeller and generates additional sources of mechanical excitation.
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a modeling methodology for substrate current coupling mechanisms. An enhanced model of the diode ensuring continuity of minority carriers is used to build an equivalent schematic, accounting for minority and majority carrier propagation in the substrate. For the first time a typical H-bridge structure is simulated with the proposed methodology. The parasitic current injected in the substrate by a high-voltage structure is simulated in a circuit-level simulator as well as with a finite elements method. Both are compared to measurements and show a very good agreement. The simulation resources needed by the proposed equivalent schematics are thus greatly reduced in regard to the finite element approach, offering an efficient tool for substrate modeling in smart power IC's.
-
[show abstract]
[hide abstract]
ABSTRACT: This paper highlights the increasing need for faster than real-time simulators of the electric power system and shows that microelectronic emulation is a very promising solution to overcoming speed problems of current numerical simulators. Research is focused on two different emulation approaches. Both of them are detailed in this paper and their electronic implementation is shown. Furthermore, the two approaches are compared and their final capabilities are depicted. By doing so, the paper shows that the two approaches are not competing; each one has its own advantages.
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a methodology for digitally calibrating analog circuits and systems. Based on the detection of an imperfection by a simple comparator, a successive approximations algorithm tunes a compensation current. The latter is generated by a sub-binary radix M/2+M DAC, which has the advantage of allowing reaching arbitrarily high resolutions at the cost of extremely small area. The methodology proposed allows the removal of any type of imperfections, at the expense of two shift registers, a few logical gates and a DAC which is smaller than the shift register.
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a complete portable laser-based projection system using twofold of one dimensional magnetic actuated MEMS linear scanning micro-mirrors. Dedicated high speed electronics was developed to drive the MEMS, detect the mirror scanning position at any time and synchronize the two mirrors and the laser pulsation. The achieved projection system head is 4.5 cm3 and is able to project colorful static images and videos (50 fps) with projection size of 50 cm diagonal at 50 cm distance with VGA (640×480 px) resolution.
-
[show abstract]
[hide abstract]
ABSTRACT: This paper presents a microelectronic emulation approach for high-speed power system computation. First, the problems of existing power system simulators are detailed. This shows that microelectronic emulation is a possible solution for solving the speed problems of existing simulators. Second, this paper presents one specific emulation approach, the so-called AC emulation approach. The ultimate objective of the AC emulation approach is the realization of a power system emulator which reproduces simultaneously a large number of phenomena of different time constants or frequencies with a much higher speed than real time. Frequency dependence of the elements is preserved and the signals propagating in the emulated network are the shrunk or downscaled current and voltage waves of the real power network. The models of the power network components are detailed. Special attention is paid to the generator model which was shown to introduce a systematic error. This systematic error is quantified, analyzed and optimized. Moreover behavioral simulation results confirm the feasibility of this approach which in turn lays the foundation for such an emulator.
-
[show abstract]
[hide abstract]
ABSTRACT: A new technique for driving silicon-on-insulator pixel matrixes has been proposed in [1], which was based on transient charge pumping for evacuating the extra photo-generated charges from the body of the transistor. An 8x8 pixel matrix was designed and fabricated using the above technique. In this paper, the measurement set-up is described and the performance evaluation procedure is given, together with results of its implementation on the fabricated pixel matrix. The results show the applicability of the charge pumping technique and the effective operation of the image sensor.
