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LPDDR S-Parameter Analysis

This guide covers specialized S-parameter analysis techniques for LPDDR mobile memory interconnects, characterizing the short, high-density channels in package-on-package configurations.

Core Topics

PoP Substrate Characterization

Learn to measure PoP interconnects:

  • Substrate S-Parameters - Package substrate frequency response
  • Ball Interconnect - PoP ball connection characterization
  • Via Transitions - Substrate via impact
  • Return Path Analysis - Ground path characterization

Package Analysis

Master memory package characterization:

  • DRAM Package - Memory device package extraction
  • SoC Package - Controller package characterization
  • Combined Path - End-to-end package path
  • RDL Effects - Redistribution layer impact

Short Channel Modeling

Understand short LPDDR channel analysis:

  • Reflection Dominant - Short channel reflection behavior
  • Impedance Discontinuities - Discontinuity identification
  • Stub Effects - Minimal stub impact analysis
  • Multi-Die Paths - Stacked die interconnect

PCB Integration

Learn board-level routing characterization:

  • Escape Routing - SoC escape path characterization
  • Via Transitions - Board via analysis
  • Plane Transitions - Reference plane effects
  • Short Trace Analysis - Minimal PCB routing

Simulation Support

Master simulation workflow enablement:

  • Package Models - S-parameter package models
  • Channel Models - Complete channel models
  • IBIS Correlation - Model validation
  • Design Guidance - S-parameter-informed design

Expected Deliverables

  • Calibrated S-parameter files
  • Package characterization data
  • Interconnect analysis
  • Impedance profile extraction

Best Practices

PoP Expertise - Understanding package-on-package interconnect behavior enables effective analysis.

Short Channel Focus - Handling reflection-dominated short channels requires adapted techniques.

Mobile Context - Delivering insights relevant to mobile design enables practical improvements.

LPDDR S-parameter analysis addresses the unique characteristics of short, PoP channels where traditional analysis techniques require adaptation.