Differential transmission assembly with common mode suppression

Abstract

A differential transmission assembly includes two metal prisms, a ground substrate, and a resistive sheet. The two metal prisms are driven differentially. Each metal prism extends along parallel lines with a space therebetween in a common direction, coplanar in a first plane, and contributing to formation of a three-dimensional electromagnetic field. The ground substrate extends in the common direction, in a second plane parallel to the first plane. The resistive sheet is disposed in a third plane aligned to be substantially perpendicular to an electric field component of a first mode of the three-dimensional electromagnetic field, and to be parallel to an electric field component of a second mode of the three-dimensional electromagnetic field.

Description

BACKGROUND[0001]1. In modern electronics, differential signals are often used to improve signal fidelity (signal to noise ratio). Differential signaling is used in a variety of settings, including:[0002]high speed digital circuits[0003]analog / radio frequency circuits[0004]high speed computation and communications equipment[0005]high voltage circuits[0006]For computation and communications equipment, differential signaling (e.g., using a serializer / deserializer) is used to address a clock skew issue. In analog and radio frequency equipment, differential signaling reduces sensitivity to electromagnetic interference. For high voltage circuits, differential signaling can be used because both transmission mechanisms can be electrically floated, and control signals or analog signals can be provided independent of the DC offset voltage.[0007]Differential signaling has costs too, and does not work perfectly in practice. For example, a single mode of signal propagation is typically desirable...

AI Technical Summary

Benefits of technology

The patent text discusses the use of differential signaling in various electronic devices to improve signal fidelity and reduce interference. However, differential signaling has its limitations, such as the need for a single mode of signal propagation and the suppression of undesirable mode signals. To address these limitations, selective filters have been used to suppress the undesirable mode signals. The patent text describes the use of differential transmission assemblies with common mode suppression to improve the performance of these electronic devices. The technical effects of the patent text include improved signal fidelity, reduced interference, and improved performance of differential transmission assemblies.

Problems solved by technology

Differential signaling has costs too, and does not work perfectly in practice.

For example, a single mode of signal propagation is typically desirable for electromagnetic signals, as multi-mode signal propagation may result in non-idealities due to coupling (interference) between signal components of the different modes.

Additionally, electrical conductors that carry a differential signal may not always have identical cross-sectional dimensions.

In addition to the intended and desirable differential signal of the differential mode, the differential transmission assembly is also accompanied by at least an undesirable common (second, even) mode signal, as well as possibly additional undesirable higher order mode signals.

Signals that are common between these segments and a bottom ground signal are of interest in the present disclosure, as these signals may be unwanted.

Additionally, the illustrations are merely representational and may not be drawn to scale.

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