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Item type:Publication, Access status: without files , Exploration of differential via stub effect mitigation by using PAM4 and PAM8 line coding(IEEE, 2017-06-08); ; ; ; The use of spectrally efficient line codings is an important factor to facilitate high bitrates. By using PAM4 and PAM8 instead of PAM2 line coding the bandwidth of the signal is reduced considerably. On printed circuit boards vias are a major cause of signal distortion. Especially via stubs lead to resonances that degrade the transmission. By using higher order line codings with a lower fundamental frequency it is possible to operate the channel at higher data rates by keeping the fundamental frequency away from the stub resonances. In this work an extensive study using eye diagrams of differential links with via stubs is conducted to investigate the correlation of stub length and signaling performance using different line codings. It can be shown that, if the fundamental frequency of PAM2 approaches the stub notch frequency, PAM4 and PAM8 will in general improve the eye openings.Publicationtype: Conference Paper82 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Effect of 3D stack-up integration on through silicon via characteristicsSilicon interposers are a key component of 3D integration and the parasitic effects due to vias in interposers are known to contribute an important part to their overall electromagnetic properties. Therefore, the modeling has been extensively studied in recent years with numerous boundary conditions, port definitions, and further assumptions regarding the modeling of metallizations and finite planes. Most studies assume that certain port definitions can be applied such that the vias can be modeled independently of their electromagnetic environment. Independent modeling of the system parts increases in general the numerical efficiency but also raises questions with regard to its validity. To study the impact, interposers inside different stack-up environments up to 100 GHz are simulated. This paper presents scattering parameters at well-defined coaxial ports from full-wave simulations. The results are also compared to results from a multi-conductor transmission line model and to results from a physics-based via model. Systematical variations are carried out which enable an assessment of the applicability of the segmented modeling approaches.Publicationtype: Conference Paper88 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Efficient design of continuous time linear equalization for loss dominated digital linksSignal degradation in high-speed data links can be mitigated by means of channel equalization. One preferred choice in conjunction with other techniques is the Continuous Time Linear Equalizer (CTLE) due to its effectiveness. Although CTLE being common technology, adaptation of design parameters regularly relies on trial and error. This work proposes a simple, yet very effective method for CTLE design, referred to as matched CTLE (mCTLE). It advocates channel characterization in the frequency domain which is crucial for the placement of CTLE poles and zeros. Demonstration and discussion based on typical interconnect topologies illustrate the novel approach in the context of existing literature.Publicationtype: Conference Paper86