Synopsys PrimeSim SPICE Demo of a 53GBd PAM4 Transmitter for Data Center Interconnects using GF FotonixTM Monolithic Silicon Photonics Technology
Yuval Shay, Director of Product Management, EDAG, Synopsys, Inc.
Luis Orbe, Applications Engineer, Sr II, EDAG, Circuit Design & TCAD Solutions, Synopsys, Inc.
In data center optics, PAM4 is gradually overtaking NRZ modulation. Although both use intensity modulation and direct detection, PAM4 encodes 2-bits into 4 intensity levels thereby cutting down bandwidth requirement of components to half for a given data rate. The IEEE 400GBASE standards require transmission support of up to 10-km using 53GBd PAM4 (4-lanes), 26GBd PAM4 (8-lanes) or 26GBd NRZ (16 lanes). In this demo, we use Synopsys PrimeSim SPICE transient and StatEye analysis capabilities to analyze a 53GBd PAM4 monolithic SiPh transmitter using GlobalFoundries Fotonix 45SPCLO process design kit. Although PrimeSim SPICE is primarily used for SIPI studies of electrical circuits and interconnects at various abstraction levels, this demonstration shows PrimeSim SPICE is also suitable for simulating high-speed, monolithic electronic-photonic integrated circuits harnessing the power of multi-threading and integration with PrimeWave environment for foundry process variability studies (including Monte Carlo and Corner analyses), post processing and advanced eye diagram measurements.
Interposer Extraction from 3DIC Compiler & SIPI Analysis
Amir Asif, Sr. Staff Application Engineer, Synopsys, Inc.
Interposer extraction is a unique challenge on its own and is different than traditional extraction of RC parasitics or traces of PCB. It is higher in speed, has ground traces nearby unlike of solid planes like PCB. This requires extraction with electromagnetic extraction tools for covering the higher bandwidth and handling unique layout. Electromagnetic extraction often requires tedious conversions of design databases, often going through export to and import from GDS format. With tight integration with extraction tools, 3DIC Compiler offers convenient flow for setting up electromagnetic extraction from 3DIC Compiler GUI and drive the extraction on the desired sections. The results of such extraction can be used for downstream analysis with HSPICE to attach driver-receiver and generate eye-diagram for final analysis.
Statistical Eye Analysis for Jitter Tracking
Khaled Nikro, R&D Engineer, Principal, EDAG, Circuit Design & TCAD Solutions, Synopsys, Inc.
PrimeSim HSPICE StatEye analysis to efficiently explore the effects of clock jitter and skew separately or combined on data signal eye diagrams.