Results 1 - 10 of 2115
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[en] A simple process to obtain silicon planes released from the substrate and provided with large area pads for ohmic contacts is described. Resistors 500 μm long with a 40 μm x 1 μm cross section were obtained. Resistance measurements showed that the current flows in a reduced cross section, probably owing to the presence of a superficial depletion layer. Preliminary magnetoresistance measurements are presented. Reduction of the resistor cross section can be obtained by thermal oxidation
[en] This paper presents a controllable resistor, which is formed by a MOS-resistor working in the deep triangle region and an auxiliary circuit. The auxiliary circuit can generate the gate-source voltage which is proportional to the output current of an low dropout regulator for the MOS-resistor. Thus, the equivalent output resistance of the MOS-resistor is inversely proportional to the output current, which is a suitable feature for pole-zero tracking frequency compensation methods. By switching the type of the MOS-resistor and current direction through the auxiliary circuit, the controllable resistor can be suitable for different applications. Three pole-zero tracking frequency compensation methods based on a single Miller capacitor with nulling resistor, unit-gain compensation cell and pseudo-ESR (equivalent serial resistor of load capacitor) power stage have been realized by this controllable resistor. Their advantages and limitations are discussed and verified by simulation results.
[en] The I/O Register to FASTBUS Interface (IORFI) is connected to a processor via two 16-bit output registers (OR1,OR2) and two 16-bit output resisters (IR1,IR2). One of the output registers (OR1) is used to specify the interface function which is to be performed when the interface is accessed via the Data-in Register (IR2) or the Data-out Register (OR2). The other input register (IR1) is used to read the direct status of the FASTBUS lines independent of OR1. The changes made to the SLAC design at the University of Illinois are described
[en] A resistor network is described which can be used to solve the partial differential equations for the scalar potential and for the only component of the vector potential in problems with cylindrical symmetry. To calculate the values of the resistors a general method is presented valid for any equation which can be solved by the resistor network analogy. (Author) 2 refs
[en] We study the corner-to-corner resistance of an M x N resistor network with resistors r and s in the two spatial directions and obtain an asymptotic expansion of its exact expression for large M and N
[en] In this paper, the design and technology are proposed for manufacturing the film tensoresistor. It is shown that at the appropriate choice of material composition and deformation conditions a film tensoresistor can be used as a strain gauge for weight measuring devices or cyclometer to determine the strength of the products to deformation. (authors)
[en] Gamification is defined as the use of game design elements in a non-game context. In higher education, gamification is a methodology intending to motivate students to acquire academical knowledge and soft skills, while keeping them engaged and pleased with the learning process. This study reports the application of a gamified class concerning electric resistors, the first of a 12-topic discipline offered to 2nd-year students in physics and engineering. Adopting a Flipped Classroom methodology and a narrative based on household power consumption, traditional contents about resistors and electricity were taught. Also, instructions about how to use an ohm-meter and how to configure an electronic spreadsheet to do basic statistics were given. In order to customize and enrich the class, some optional contents (usually in a video) were made available. The access to the experimental activities was constrained by approval in four graded quizzes. Every activity was acknowledged by virtual coins to be converted in benefits (extra time to run final examinations, permission to consult class appointments and the opportunity to re-discuss a mistake in the final examination) and points, to rank students (leaderboard). Forty-five students attended the gamified class. No control group was implemented because this study aimed to find a good design for a gamified class, not to compare traditional to active methodologies. The overall student acceptance was excellent, and they reported that gamification can be a more engaging methodology than traditional classes, further developing soft skills and academic knowledge. However, the time spent to run the gamified class must be arranged, reducing the time inside the classroom. The opportunity to perform the experiment was considered essential, and could not be substituted by videos or texts since new doubts and concerns are pointed out during the practice when the teacher is present. Gamification can be a methodology capable of engaging and being enjoyable students, giving them more than just information but also soft skills. (paper)
[en] A low-power, highly linear, multi-standard, active-RC filter with an accurate and novel tuning architecture is presented. It exhibits IEEE 802.11 a/b/g (9.5 MHz) and DVB-H (3 MHz, 4 MHz) application. The filter exploits digitally-controlled polysilicon resistor banks and a phase lock loop type automatic tuning system. The novel and complex automatic frequency calibration scheme provides better than 4 corner frequency accuracy, and it can be powered down after calibration to save power and avoid digital signal interference. The filter achieves OIP3 of 26 dBm and the measured group delay variation of the receiver filter is 50 ns (WLAN mode). Its dissipation is 3.4 mA in RX mode and 2.3 mA (only for one path) in TX mode from a 2.85 V supply. The dissipation of calibration consumes 2 mA. The circuit has been fabricated in a 0.35 μm 47 GHz SiGe BiCMOS technology; the receiver and transmitter filter occupy 0.21 mm2 and 0.11 mm2 (calibration circuit excluded), respectively.