Behraad Bahreyni

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In this paper, analytic modeling and simulation results are described for a new design of micromachined resonant magnetic field sensor. The sensing methodology for this design is based on measuring the shift in the resonant frequency of an electrostatic comb-drive resonator, when the sensor is exposed to an external magnetic field. An analytic model of the(More)
This paper presents a compact, low power, digitally assisted differential capacitive-sensing readout circuit. It utilizes digital design and switch-based synchronous demodulator to reduce area and power consumption while improving the robustness of the system by diminishing the effects of interfering signals. To broaden the sensing range of the system, the(More)
Development of a miniaturized biosensor system that can be used for rapid detection and counting of microorganisms in food or water samples is described. The developed microsystem employs a highly sensitive impedimetric array of biosensors to monitor the growth of bacterial colonies that are dispersed across an agar growth medium. To use the system, a(More)
This paper discusses the application of the recently proposed twin-beam structure for fabrication of piezoresistive sensors and also for estimation of material properties. Instead of using common methods to isolate the piezoresistors from the structure by means of an insulating thin film or by reverse-biased junctions, the twin-beam structure relies on(More)
This paper is a review of the remarkable progress that has been made during the past few decades in design, modeling, and fabrication of micromachined resonators. Although micro-resonators have come a long way since their early days of development, they are yet to fulfill the rightful vision of their pervasive use across a wide variety of applications. This(More)
This paper presents a novel circuit topology to be used with a differential capacitive microsensor. Adopting sampling switches and utilizing modified digital blocks has resulted in a remarkably compact and low-power design. The high linearity in conversion of charge to voltage and the wide range applicability of proposed topology satisfies the design(More)
Design of an intelligent controlling module as well as the signal processing module for a novel capacitive proximity sensing system for robotic applications are proposed. The capacitive sensor is composed of a 4×4 matrix of electrodes. The intelligent controlling module is mapped on an FPGA device embedded in the robotic unit; and is utilized to(More)