Switch ASIC and Optical Transceiver Assembly for Signal Integrity

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Solution Overview

Problem

Current high-speed switch ASICs face challenges in signal integrity and heat dissipation due to long electrical connections and inadequate heat management in network servers, which affects data throughput and reliability.

Innovation Solution

The integration of a switch ASIC and optical transceiver assembly on a high-speed substrate with Through Silicon Vias (TSVs) and a pluggable optical connector allows for efficient heat dissipation and minimizes signal distortion by using a compact, reflow solderable assembly with a heat spreader, enabling external laser connection and efficient thermal management.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the switch ASIC and optical transceiver assembly are integrated on the same high-speed substrate, then signal integrity is improved due to shorter electrical connections, but device complexity increases due to the integrated assembly structure

Engineering Contradiction:

Improvesignal integrityVSAvoidassembly structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent integrates the optical transceiver assembly and switch ASIC on the same high-speed substrate, merging previously separate components into a unified structure. This co-packaging approach shortens electrical connection lengths between the transceiver and switch ASIC, thereby improving signal integrity while maintaining manageable complexity through standardized integration processes

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

If TSVs are used in the transceiver chip to separate optical interfaces from electrical interfaces, then wire bonding is eliminated and heat dissipation is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improvesignal integrityVSAvoidTSV alignment

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent replaces traditional wire bonding mechanical connections with TSV-based electrical connections. The TSVs provide both electrical connectivity and structural support, eliminating the need for separate wire bonding processes. This substitution improves heat dissipation pathways while maintaining signal integrity through direct vertical connections through the substrate

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Temperature

If a heat spreader is placed on top of the transceiver assembly, then heat dissipation efficiency is improved, but the device complexity increases due to additional thermal management components

Engineering Contradiction:

Improveheat dissipationVSAvoidthermal management structure

Core Design Contradiction:

TemperatureVSDevice complexity

Solution Approach 1:

The patent introduces a heat spreader as an intermediary thermal management component between the transceiver assembly and the external environment. This heat spreader acts as a thermal conduit that distributes heat away from critical components, improving overall heat dissipation efficiency while using a standardized component that minimizes added complexity

Inventive Principle:

Principle #24Intermediary (Mediator)

4Temperature

If the pluggable optical connector uses a stack of silicon pieces, then heat dissipation from the transceiver chip is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveheat dissipationVSAvoidconnector assembly

Core Design Contradiction:

TemperatureVSEase of manufacture

Solution Approach 1:

The patent employs a composite structure for the pluggable optical connector using multiple silicon pieces with different thermal and optical properties. This composite construction optimizes heat dissipation pathways while maintaining optical performance, utilizing materials science principles to achieve superior thermal management in the connector assembly

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration enhances data throughput by reducing signal distortion and improving heat dissipation, leading to increased reliability and efficiency in high-speed data processing and transmission.

Implementation Method 1

TSV with metal pads, this being the term used by those skilled in the art, to describe through silicon via, a connection line to a conductor track connection or metal pad situated below the transceiver chip substrate bottom side

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

heat spreader on top of the transceiver assembly which allows for placing a heat spreader on top of the transceiver assembly

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 3

heat can be very efficiently dissipated away from the transceiver chip

Methodology Applied

Scientific EffectConvection: Convection

Implementation Method 4

Optical transceivers, this being the term used by those skilled in the art, serve as transmitters and receivers for converting electrical data signals into optical signals, and vice versa

Methodology Applied

Scientific EffectPhotoelectric effect: Photoelectric Effect