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In this paper, a frequency dispersion of transmission characteristics of shielded-flexible printed circuits (FPC) for differential-signaling is studied experimentally and numerical modeling based on an equivalent circuit model. Firstly, differential-mode impedance, the mixed-mode scattering parameters and eye-diagram are discussed. Secondly, the frequency dispersion of the transmission characteristics...
A method to obtain the effective characteristic impedance of transmission line in meshed-ground FPC is investigated. Above on plenty of data, through the least square method, a relationship between the characteristic impedance and structural parameters of FPC is proposed for common design, with which it is more convenient to design the structure after getting the characteristic impedance.
In this paper, a frequency dispersion of transmission characteristics of shielded-flexible printed circuits (FPC) for differential-signaling is studied experimentally and numerical modeling. Firstly, differential-mode impedance, the mixed-mode scattering parameters and eye-diagram are discussed. Secondly, frequency dispersion of transmission characteristics is discussed by using RLGC equivalent-circuit...
Negative group delay is one of the anomalous characteristics of the metamaterial, and can be used to compensate the group delay of systems and is applicable to signal processing devices. In this paper, to achieve negative group delay with not only wide-band characteristics but also low-insertion loss, we newly propose the embedded transmission line with half-wavelength type folded-stepped impedance...
To provide basic considerations for the realization of method for suppressing the EMI from differential-paired lines on flexible printed circuits (FPC), the characteristics of the SI performance and shielding effectiveness (SE) of shielded-flexible printed circuits for differential-signaling are investigated in this paper experimentally and by a numerical modeling. Firstly, transmission characteristics...
In order to provide basic considerations for the realization of methods for suppressing the mode-conversion and EM radiation from differential-paired lines with length mismatch, the mode-conversion in bend differential-paired lines with different EM coupling was studied with FDTD modelling. It is demonstrated that the differential-paired line with thinner dielectric substrate which can maintain narrow...
This paper newly attempts to propose a method for compensating the mode-conversion by double negative (DNG) material, for establishment of SI performance and suppression of imbalance (common-mode: CM) component and EMI generated by differential-paired lines with bend discontinuities. To demonstrate the impact of the DNG material on CM component, the simulated |Scd21|, which is defined as the conversion...
Negative group delay characteristics can be used to improve signal-integrity performance such as equalizer for compensation of the group delay of transmission line (TL). This paper newly proposed the embedded multi-stage Folded-Stepped Impedance Resonator (F-SIR) structure with open-stub resonator, in order to establish negative group delay and slope characteristics. The concept of the proposed TL...
For differential-signaling system, the ideal balance or symmetrical topology cannot be established due to discontinuities at turnoff point (90-degree turn), so called bending, and hence, an imbalance component is excited. Therefore methodology and geometrical-structure for satisfying both SI and EMI performances are indispensable. In order to provide basic considerations for the realization of methods...
To provide the basic considerations for EM radiation from practical asymmetrical differential-paired lines with bend routing, this paper newly attempts to propose locally shielded differential-paired lines for establishing SI performance and suppressing imbalance component and EMI generated by differential-paired lines with bend (turnoff point) discontinuities. The conductive plane is placed on discontinuity...
For differential-signaling system, the ideal balance or symmetrical topology cannot be established due to bend (turnoff point) discontinuities, and hence, an imbalance component is excited. Therefore methodology and geometrical-structure for satisfying both SI and EMI performances are indispensable. In order to provide basic considerations for the realization of methods for predicting and suppressing...
For actual differential-signaling system, the ideal balance or symmetrical topology cannot be established, and hence, an imbalance component is excited. To provide the basic considerations for establishment of predicting the EM radiation from practical differential-paired lines, this paper attempts to identify the dominant factor of imbalance component and EM radiation from asymmetrical differential-paired...
To provide the basic considerations for establishment of predicting the EM radiation from practical differential-paired lines, this paper attempts to quantify the correlation between imbalance components and EM radiation from asymmetrical differential-paired line with different serpentine equi-distance routing. The differential-paired lines with different layouts were prepared for the discussion as...
Multi-channel differential-signalling scheme is one of the key technologies for modern electronics systems. For actual system, the ideal balance or symmetrical topology cannot be established, and hence, an imbalance component is excited. To provide the basic considerations for establishment of predicting the EM radiation from practical differential-paired lines, this paper attempts to quantify the...
Differential-signaling (DS) techniques such as low-voltage differential-signaling (LVDS) are widely used in digital electronic devices in order to establish a high-speed digital propagation with low-electromagnetic interference (EMI). For actual DS, the ideal balance or symmetrical topology cannot be established, and hence, an imbalance component is excited in practical high-density packaging systems...
In this study, we newly attempt to clarify the material dependencies of arc characteristics at slowly breaking contact changing by the Ag based different material pairs. Firstly, the contact voltage, current waveforms and arc columns are measured. Secondary, the material dependencies of the arc duration, the spread and concentration of the arc column are discussed. Finally, the arc voltage fluctuation...
An UWB RF system can be used in the area of signal processing. Phase Locked Loop (PLL) is one of the important key technologies for broadband communication and signal processing. The phase-noise of output voltage of the oscillator with PLL should be suppressed for the performance. The low phase-noise characteristics as well as the broadband and high-frequency use are very important factor for the...
Since electromagnetic (EM) noise resulting from an arc discharge disturbs other electric devices, parameters on electromagnetic compatibility, as well as lifetime and reliability, are important properties for electrical contacts. To clarify the characteristics and the mechanism of the generation of the EM noise, the arc column and voltage fluctuations generated by slowly breaking contacts with external...
For actual Differential-signaling (DS) techniques such as low-voltage differential-signaling (LVDS), the ideal balance or symmetrical topology cannot be established, and hence, an imbalance component is excited in practical high-density packaging systems. In this paper, we newly attempt to identify and quantify the frequency responses of the imbalance component and electromagnetic (EM) radiation from...
Negative group delay characteristics can be used to signal processing devices such as equalizer for compensation of the group delay of systems, and pulse compression circuit of radar systems. In this paper, to clarify negative group delay characteristics achieved by planar structure, we designed the Folded-Stepped Impedance Resonator (F-SIR) structure on printed circuit board (PCB), which has the...
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