Delay line structure

Abstract

A delay line structure disposed on a substrate having a dielectric base layer formed with a via, a layout layer and a grounding layer with a grounding circuit, includes two parallel spiral delay lines having a first outer straight section, a first outer bent section, an inner spiral region, a second outer bent section and a second outer straight section. The inner spiral region bends reciprocally between the first and second outer straight sections to form several inner bent parts and several inner straight parts. A grounding guard trace is disposed among the first and second outer straight sections and the inner straight parts and is coupled electrically to the grounding circuit, wherein each of the first and second outer bent sections and the inner bent parts has a width smaller than each of the first and second outer straight sections and the inner straight parts.

Description

[0001]This application claims the benefits of the Taiwan Patent Application Serial No. 100128341 filed on Aug. 9, 2011, the subject matter of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a differential flat spiral delay line structure, and more particularly to a differential flat spiral delay line structure with grounding guard traces and strong coupling line parts.[0004]2. Description of the Prior Art[0005]Signal synchronizing is always a concern when it comes to the high speed digital signal. Usually the requirement of synchronizing signals is met by increasing the delay time with a delay line. To be more specific, for high speed signal or signal over shorter transmission circuit, a delay line structure is usually used in order to delay the transmission time.[0006]Due to limited space in the substrate of an electronic device, the delay line is usually bent in order save the occupying spac...

AI Technical Summary

Benefits of technology

The present invention provides a differential flat spiral line structure with grounding guard traces that reduces crosstalk noise disturbance and improves signal synchronization. By reducing the width at the bent section between the spiral delay lines, strong coupling effects are formed, resulting in effective noise reduction and improved signal transmission. The distance between the spiral delay lines consisting of the bent sections is reduced, which synchronizes the transmission of signals at the same rate. This structure also reduces crosstalk noise disturbance at the straight sections and ensures reliable signal transmission.

Problems solved by technology

In the prior art technique, crosstalk noise disturbance is common at the straight sections of the spiral delay lines and there exists the different transmission speed of the signals at the bent section.

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