A Low-Cost, High-Bandwidth I/O Transceiver Based On Switched-Current Techniques

8/9/99


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Table of Contents

A Low-Cost, High-Bandwidth I/O Transceiver Based On Switched-Current Techniques

Motivation

Goals

Outline

Signaling Problem

Noise

Eye-Diagrams

Conventional Signaling

Source Synchronous Interface

Phase Jitter Limits Interface Performance

CGaAs Multichip PowerPC Microprocessor

Motorola 0.5 um CGaAs

Packaging Technology

Early CGaAs Work

Conventional Interfaces in CGaAs

CGaAs Test Chip

Measured Results: Process Monitor Stuctures

Eye Diagram

Scannable Transmitter/Receiver

Scannable Chip Measurements

Prototype MCM

Advanced CGaAs Circuits

Cascoded Switched-Current Termination

Active Current Mirror Termination

ACMT Implementation

Dynamic Biasing Network

Implementation

Simulation: Supply Mismatch

Simulated Performance

CGaAs Delay-Locked-Loop (DLL)

Design Details

Simulated Performance

Source Synchronous Interface

Interface Simulations

CMOS ACMT

CMOS Implementation

CMOS Dynamic Biasing Network

Dynamic Biasing Network: Supply Mismatch

Process Corners

Test Chip

Process Monitor

Output Pad Characteristic

Static Biasing Eye Diagram

Dynamic Biasing Eye Diagram

Measured Results

Relative Performance

Future Work

Contributions

Contributions

Author: Claude Gauthier