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Benefits

  • Enables early assessment of cable and interconnect choices without requiring detailed EM or PCB models.
  • Helps uncover issues related to excessive loss, delay, skew and voltage drop before hardware build.
  • Supports what-if analysis on length, routing, cable type and termination, directly linked to system performance metrics.
  • Provides a consistent abstraction that can be reused across multiple system architectures and programs.
  • Facilitates co-design of RF, digital, power and thermal subsystems by including the physical link in the system model.

The Cables and Interconnects library in VisualSim Architect provides behavioral models of physical media used to connect RF, mixed-signal, digital and power components. These blocks represent coaxial cables, twisted pairs, backplane traces, harnesses and power feeds, capturing attenuation, dispersion, delay, reflections and bandwidth limitations at a system level.

System architects can use these models to understand how cable length, routing, impedance, loss and crosstalk affect signal integrity, latency, link budget, power delivery and overall system performance, long before detailed EM or PCB design is completed.

Overview

This library includes parameterizable models that abstract key properties of cables and interconnects:

  • RF and Coaxial Cables – Models for RF signal transport between power amplifiers, antennas, mixers and other RF blocks.
  • High-Speed Digital Links – Behavioral models of differential pairs and backplane traces used with standards such as JESD, PCIe, Ethernet and custom serial links.
  • Twisted Pair and Harness Models – Abstract wiring and harnesses for automotive, aerospace and industrial networks.
  • Power Cables – Approximate voltage drop, resistance and current handling for DC and low-frequency power distribution.
  • Loss, Delay and Dispersion – Frequency- and length-dependent attenuation, group delay and basic dispersion behavior.
  • Impedance and Reflections – Simple reflection and mismatch modeling based on characteristic impedance and terminations.

These components can be connected between Communication System, Power Amplifier, Antenna, Processor and other blocks to provide a realistic physical-layer context for system-level simulations.

Supported Standards

  • Length-Dependent Behavior:
    • Parameterized cable length and propagation velocity.
    • Delay and attenuation that scale with length and frequency/bit rate.
  • Frequency-Selective Loss:
    • Simplified frequency-dependent attenuation curves.
    • Approximate bandwidth and roll-off characteristics.
  • Impedance and Termination:
    • Characteristic impedance and simple termination models.
    • Basic reflection and mismatch effects (VSWR-style abstraction).
  • Jitter and Skew (Digital Links):
    • Configurable timing jitter and lane-to-lane skew for multi-lane links.
    • Impact on effective eye opening and timing margin (behavioral metrics).
  • Noise and Crosstalk (Abstract):
    • Background noise and optional crosstalk terms for neighboring cables.
  • Power Cable Effects:
    • Series resistance, I²R losses and approximate voltage drop vs. load.
    • Simple current-limit and over-stress indicators.
  • Multiple operating modes for RF, high-speed digital, low-speed control and power.

Key Parameters

  • Cable_Type – RF coax, twisted pair, backplane trace, harness, power cable, etc.
  • Length – Physical length of the cable or trace.
  • Propagation_Velocity – Effective signal velocity (fraction of speed of light).
  • Attenuation_per_Length – Loss factor (per unit length, possibly frequency-dependent).
  • Bandwidth / Cutoff_Frequency – Effective signal bandwidth supported.
  • Characteristic_Impedance – Nominal impedance (e.g., 50 Ω, 75 Ω, 100 Ω differential).
  • Termination_Impedance – Load and source terminations for mismatch modeling.
  • Jitter / Skew (for high-speed digital) – Timing uncertainty and lane skew.
  • Noise_Level / Crosstalk_Factor – Abstract noise and coupling parameters.
  • Resistance_per_Length (for power cables) – Used to estimate I²R losses and voltage drop.
  • Current_Limit – Maximum allowable current before over-stress indication.
  • Operating_Temperature_Range – Envelope for safe operation when linked to thermal models.

Applications

  • RF and Communication Systems
    • Modeling RF cables between power amplifiers, filters and antennas.
    • Evaluating link budget and coverage with realistic cable loss and mismatch.
  • High-Speed Digital Interfaces
    • JESD, PCIe, Ethernet and other serial links routed over backplanes and cables.
    • Studying impact of length, loss and skew on throughput and error rate.
  • Automotive and Aerospace Harnesses
    • Wire harness models for CAN, LIN, FlexRay and Ethernet-TSN networks.
    • Investigation of latency, loading and power distribution along long harnesses.
  • Power Distribution
    • Estimating voltage drop and thermal stress in power cables.
    • System-level planning of power feeds to high-power RF or digital loads.
  • System Integration Studies
    • Co-analysis of RF, digital, power and thermal domains with physical routing effects.

Integrations

The Cables and Interconnects library integrates with:

  • Communication System library for RF chains, modulation and channel modeling.
  • Power Amplifier library for PA-to-antenna and PA-to-filter connections.
  • Antenna models for complete link-budget analysis and coverage studies.
  • High-speed digital components such as JESD, PCIe and Ethernet blocks.
  • Power supply and regulator models for end-to-end power distribution analysis.
  • Thermal models for approximating heating due to cable and connector losses.
  • Traffic Modeling to observe how varying load patterns impact link utilization and stress.

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