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qsfp_breakout's Introduction

Work-In-Progress: Design being tested. A second revision will be needed as the QSFP Cage Mounting pads are incorrect.

QSFP Footprint Footprint Error

QSFP Breakout

QSFP to U.FL/UMCC Connector breakout.

QSFP Breakout Board

Additional I2C circuitry is due to this being a stepping stone project for an OpenCAPI to dual QSFP design. OpenCAPI has only a single I2C interface.

PCB Layout

QSFP Breakout PCB Layout

All differential signals are length-matched to within 1mm of a 25mm total length, both inter-pair and intra-pair.

Schematic

QSFP Breakout Schematic

PCB Layer Stackup

4-Layer PCB stackup taken from JLCPCB.

PCB Layer Stackup

100-ohm Differential Impedance parameters were calculated using the DigiKey Online Calculator.

PCB Differential Impedance Calculation

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