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In this paper, a novel circuit for clock synchronization utilizing an interleaved delay line for coarse tuning and a phase interpolation component for fine tuning is proposed. The interleaved delay line improves the precision to nearly half of conventional SMD and roughly aligns the output clock in two cycles. The rest phase error is compensated by the fine tuning component with binary search scheme...
This article presents a novel 11 GHz 2-port antenna array design for mobile phone applications with diverse end-fire radiation patterns. The constructed prototype uses novel LIM (Laser Induced Metallization) technologies of ITRI to implement two symmetrical patch antennas closely integrated at both side areas of a corner of a mobile phone casing successfully. The antenna grounds and radiating patches...
This paper presents a 1.0Mb high-performance 0.6V VMIN 6T SRAM design implemented in UMC 55nm Standard Performance (SP) CMOS technology. This design utilizes an adaptive LBL bleeder technique to reduce Read disturb and Half-Select disturb of 6T cells while maintaining adequate sensing margin. A bleeder timing control circuit adaptively adjusts the LBL voltage level prior to Read/Write operation to...
In this study, an electromagnetics-based inverse sensitivity mapping method is introduced for applications in high field MRI. Instead of using simplistic numerical approximations, the sensitivity of the radio-frequency coil was determined through a field approach by using iterative optimization. The current study is an extension to previous studies on the inverse method, which has restricted itself...
A shielded, non-overlapped 9.4T 8-element transceive volume array was designed and constructed for small animal MRI studies. The coil configuration was optimized to obtain an appropriate trade-off between coil sensitivity, field penetration, and mutual decoupling. The simulated and experimental results presented herein demonstrate that the new volume array is capable of offering higher RF penetration,...
In this study, three types of radio-frequency shields are studied and compared in the context of ultra-high field small-animal magnetic resonance imaging. It has been demonstrated that the coil penetration depth and mutual coupling between the coils depend heavily on the type of shield employed. The results were used to guide the design of a 9.4T 8-element transceive small animal array, which provides...
Magnetic resonance imaging (MRI) is widely used in human breast cancer detection, and the advancement of the radio-frequency (RF) phased-array technology promises to further improve the diagnostic image quality. In this paper, an inverse design method is presented for the theoretical design of an ellipsoidal RF phased array coil for human breast MRI. The target field technique was used to analytically...
This paper presents a self-injection-locked (SIL) sensor array for cancelling the effects of random body movement on the detection of vital signs. To achieve this goal, a subject is seated between two SIL sensors to measure rates of respiration and heartbeat using the Doppler shift, and the effects of random movements by the subject are cancelled by wireless mutual injection locking (MIL) of the two...
The draping and buckling of woven fabric is simulated based on full Lagrange finite element method. In the finite element analysis, the woven fabric sheet is discretized with 8-node shell elements. In the incremental load analysis, the method of load control and displacement control is alternately used to analyze the critical buckling load and buckling mode of fabric sheet and post-buckling deformation...
The impacts of several factors (extractant volume, dispersant volume, extractant type, dispersant type, pH, salt effect, extraction time and grain size) on dispersive liquid-liquid microextraction-solidification of floating organic drop of DecaBDE from river sediments based on undecanol were investigated by an interactive orthogonal experimental array design, and the significant factors were obtained...
In this paper, a high resolution direction of arrival (DOA) estimation algorithm is proposed that based on the usage of nonlinear function of sum and difference beam. The generalized expression of this technique for different scenarios was derived in details. Unlike the conventional high resolution algorithm such as the MVDR, the MUSIC, and the ESPRIT, the proposed algorithm keeps the high resolution...
A broadband high resolution algorithm is proposed to estimate direction of arrival (DOA) of the source based on two stages beamforming and the sub array partition approach. The two stages beamforming scheme includes the sub array broadband beamforming stage and the minimum variance distortionless response (MVDR) beamforming stage in sub array level. Consequently, the proposed algorithm can be applied...
Impulsive transient badly influences power system and electrical equipments at aspects. A novel TVS array based impulsive transient suppression device with straightforward structure and easy control strategy that works on 220 V (phase voltage) power line to protect low voltage apparatus is proposed in this paper. Through analyzing characteristics of transient voltage suppressor (TVS), the idea of...
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