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Method for a tapered adhesion slot with spikes optimized for high-speed signaling

IP.com Disclosure Number: IPCOM000033857D
Publication Date: 2004-Dec-30
Document File: 4 page(s) / 108K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for a tapered adhesion slot with spikes optimized for high-speed signaling. Benefits include improved functionality and improved performance.

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Method for a tapered adhesion slot with spikes optimized for high-speed signaling

Disclosed is a method for a tapered adhesion slot with spikes optimized for high-speed signaling.  Benefits include improved functionality and improved performance.

Background

      Ever increasing, high-speed differential bus bit rates are a very challenging problem. The on-die device parasitic capacitance and package inductance parasitic have a large impact on the signal quality. They require wide bandwidth at the driver and receiver circuitries, which results in narrow bandwidth for high-speed differential buses. To compensate, rectangular adhesion slots can be placed on the reference planes to create a low-pass low-capacitance (LC) filter to improve the bandwidth of the differential bus. Due to the increased routing density near the die-escape region, many signals must be routed over these slots, creating noise and negatively impacting timing of high-speed signaling (see Figure 1).

      Conventionally, the problem is solved by not routing signals over adhesion holes. However, due to the impact of on-die analog device capacitance and to handle multiple isolated power supplies, signals get routed over voids, resulting in increased crosstalk and noise. As routing densities increase with every technology generation, the conventional approach limits the high-speed operation of the channel.

General description

      The disclosed method is a uniquely shaped adhesion hole optimized for high-speed signaling.

              The key elements of the method include:

•             Tapered, elongated adhesion slot
•             Metal spikes (projections) protruding into the slot

Advantages

              The disclosed method provides advantages, including:

•             Improved functionality due...