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We propose a new design methodology to broaden the bandwidth of a single-section 90° branch-line coupler (BLC) with arbitrary coupling level. The method used here to broaden the BLC bandwidth is to replace conventional uniform transmission lines that would never be feasible in many implementations with nonuniform lines governed by a truncated Fourier series. Based on how impedances are profiled, the...
A novel and simple structure for improving CMRR is introduced. This structure can be added to the circuits like folded cascode amplifier, telescopic amplifier, current buffers, .etc to improve the CMRR of these circuits. This simple and effective circuit uses common mode deviating technique to improve CMRR at least 12dB while preserves CMRR bandwidth which is a novel technique in order to improve...
In this paper we propose a variable-gain transimpedance amplifier suitable for low-power applications. Its noise, bandwidth and input impedance performance are similar to a more conventional regulated-cascode common-gate transimpedance with resistive load, with the same power consumption and gain performance. The proposed amplifier has, however, variable gain, which can be easily changed by setting...
Working robots may encounter and interact with various objects, whose dynamical characteristics are unknown; linear or nonlinear and their strength of stiffness. The interaction includes such processes as collision of arm with environments, hand gripping of objects, holding human body in medical case etc. These processes consist of free motion before touching the objects, and constrained motion after...
The distortion of a current-steering digital-to-analog converter (DAC) is often dominated by the signal-dependent output impedance. This has normally been analysed by assuming a purely resistive load. When a digital IF signal is generated, the different harmonic bands are separated and can also be filtered separately. This paper illustrates that linearity can be improved considerably by shorting the...
The novel design with the adaptability prevents from unexpected stimulus current for medical safety, since the safety is the prime concern for human use. The prototype of the stimulus driver circuit for micro-stimulator used in implantable device is presented in this paper. For epilepsy control, the target of the driver is to output 30-μA stimulus currents, as the tissue impedance varies within 20~200...
Loss allocation to each user based on fair and justice is the main content of electrical power transmission cost reasonable allocation in Electricity Market. Making use of the uniqueness of Shapley value and distinctive features of shapley theorem, power sources and load are regard as players in a union. That is transform power source to equivalent voltage source and load to impedance based on Thevenin...
This paper presents a RFID tag antenna at 900MHz which has a wide frequency band, meeting that of Chinese standard from 860MHz to 960MHz, and it possesses easy conjugate impedance matching property by adopting an arc-shaped feeding. With a typical antenna impedance of Monza3 (Impinj), the proposed tag of compact size 30×70mm2 has a stable performance through 100MHz frequency bandwidth.
This paper makes a study of an algorithm of fault location for double transmission line on the same tower. The algorithm is based on model of distributed parameters. The location equation set is deduced and the solving of the equation set is researched.
This paper analyzed the logic structure of composite transportation system which was composed of car network, bus network and urban rail network, and represented the logical relation between each modal-sub-network by building 3D model. By analyzing the constituent structure of composite network, choosing attributes and analyzing travel impedances, the composite traffic system network was established,...
An electrical model of the 104 MHz radio frequency quadrupole (RFQ) accelerator at Peking University is introduced for RF design, based on which every crucial geometrical parameter is swept and selected carefully to improve the RF properties of the RFQ such as the intrinsic quality factor and shunt impedance for reducing its power consumption. Moreover, flatness tuning of the inter-electrodes voltage...
The no-load steady-state performance of a Y-connected three-phase induction generator under single-phase operation is studied, and the effects of combination between balance capacitors and excitation capacitors on the terminal voltage are analyzed. The loop impedance equation is obtained by employing the symmetrical component method. With both real and imaginary parts of the loop impedance equal to...
Nowadays, Sensor network is extensively practical in numerous fields including general engineering, agriculture and environmental monitoring, health monitoring and surgery [1]. Sensors are designed as increasingly efficient and Miniature. As a matter of fact, the most important factor in the design of RF communications is the size of the antenna [2]. In fact, Miniaturization will be subject to steady...
On the basis of the modified nodal analysis, universal matrices-stamps are defined for modeling several types of current conveyor. From these stamps, the so-called Dragonfly Mason-Coates' graphs are derived for a fast hand-and-paper symbolic analysis of current-conveyor circuits.
This paper deals with the use of the integrated circuit electromagnetic model (ICEM) to analyze, predict, and optimize auto compatibility and electromagnetic emission at PCB level. ICEM is currently under standardization process (IEC62014-3). The basic ICEM architecture is composed of a power distribution network model and an internal current source modeling digital activity. Such an approach enables...
Modern traction electrification systems are a source of magnetic emissions and possible interference for many internal and external equipment; this is particularly true for light rail or street car systems running through cities and in close proximity to public sensitive installations. In this paper, an analysis of the magnetic field from a light rail is presented. Furthermore potential design mitigations...
Track Circuits (TCs) are the most diffused and popular train detection system and they are in close relationship to the concept of track integrity, in terms of robustness with respect to and monitoring of track defects (such as broken rails, component disconnection, etc.). In this paper the general modeling of TC transfer functions is presented, together with an analysis of the sensitivity to TC parameters...
Abstract-Advancements in VLSI technology has made it possible to have more than eight metal layers connecting millions of closely placed devices in a single IC chip. Different interconnect layers run across the chip and the necessary connections across the layers are made through vias. The impedance discontinuity at the junction of the via and the interconnect line creates signal reflections and contributes...
The use of performance trade-off fronts, also known as Pareto fronts, in emerging design methodologies for analog integrated circuits is a keystone to overcome the limitations of the traditional top-down methodologies. However, most techniques reported so far to generate the fronts neglect the effect of the surrounding circuitry (such as the output load impedance) on the Pareto-front, thereby making...
This paper presents a new protection scheme for AC zonal distribution system proposed for future marine power systems based on active impedance estimation. This technique actively imposes small transient disturbances onto the system at a point of measurement to excite the system in real time and estimate the system impedance over a broad frequency range at that point. The identified impedance can...
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