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At a differential transmission line bend, a differential mode propagated in a differential transmission line is converted to a common mode due to asymmetry of the transmission line. The common mode conversion leads to problems with signal integrity. We propose a method to improve electric symmetry of the transmission line bend and thus reduce the common mode conversion. The self-capacitance and inductance...
In response to the requirement of novel crosstalk-reduction scheme for high density through silicon via(TSV) interconnects in silicon interposer, this paper presents a structure and performance analysis of through-silicon via(TSV) with direct ohmic contact between a ground TSV and silicon substrate for coupling mitigation purposes. We further expand the structure to a 3×3 TSV array and investigate...
Controlling the common-mode currents induced on wiring harnesses plays an important role in meeting automotive electromagnetic compatibility requirements. For high-frequency signals, the key to controlling these common-mode currents is maintaining the same electrical balance in the harness that was present on the circuit board. When routing differential signals such as LVDS or CAN signals, designers...
We derived expressions of power and ground voltage noises for reducing common-mode voltage in a power distribution network of an LSI and found that they have the same amplitude and a phase difference approaching 180°. To confirm this, we performed an experiment using a test board with a cover-metal structure-essentially, a floating conductor in an LSI package to reduce common-mode voltage. The evaluation...
The equivalent-circuit expression of bend discontinuity in differential transmission lines, which is derived from the view of the mode-decomposition technique, is proposed in this paper. We investigated the relationship between the amount of mode conversion in the bend region and two components in the modal equivalent circuit: the mode-conversion sources and the modal reactances (modal inductances...
Resonances in power distribution network are the major cause of voltage fluctuation and noise problems. In this paper, a new method that suppresses impedance peak is proposed. The proposed method uses a high series resistance (HSR) capacitor in parallel to regular bypass capacitors. By selecting the parameters so that the series resonance frequency of the HSR capacitor equals to the anti-resonance...
The Van Veen Loop, Large Loop Antenna (LLA), or Loop Antenna System (LAS), provides rapid determination of the net magnetic dipole moment of compact devices, especially in the frequency range of 9 kHz to 30 MHz, with minimal post processing of measured data. The symmetric shielded loop structure inherently rejects electric field excitation to a large extent if the action of the current transformer...
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