Jiaxin Sun , Founder of Julin: Empowering High-Fidelity System Design with SIDesigner, a Golden-Level Precision SI/PI Sign-off Platform

On November 20, the 2025 Integrated Circuit Development Forum (Chengdu-Chongqing) and the 31st Integrated Circuit Design Exhibition (ICCAD-Expo 2025) officially opened in Chengdu.

Jiaxin Sun, founder of Julin Technology, was invited to attend the high-level forum and delivered a keynote speech titled "Sign-Off Design with SIDesigner." Focusing on the complex requirements of cross-domain (electromagnetic + circuit + system) simulation, Jiaxin Sun systematically elaborated on Julin Technology's thinking and practical path in the fields of SI and PI (Signal Integrity/Power Integrity).

The Post-Moore Era: System-Level Performance Bottlenecks

In the post-Moore era, driven continuously by data surges and computing power demands, the boundaries of system performance increasingly depend on the transmission quality of signals and power. The popularization of high-speed interfaces and the rise of advanced packaging technologies such as Chiplet have made collaborative design and precise sign-off from chip, through packaging, to board level critically important.

Traditional point tools often suffer from accuracy breaks and process fragmentation in cross-domain simulation, struggling to cope with the complexity of multi-physics field coupling. System-level SI/PI issues have become a core bottleneck restricting product performance and R&D efficiency. "The EDA industry needs innovation to solve the problems developers encounter. Especially under current international competition and cooperation dynamics, it is particularly important to build suitable EDA tools for the future," Jiaxin Sun believes.

SI/PI: The Core of High-Fidelity Data Transmission

Facing this challenge, Julin Technology has positioned SI/PI as the strategic fulcrum for building future EDA tools. SI/PI is the physical cornerstone ensuring high-fidelity data transmission and determining system stability. It runs through the entire chain of chip, packaging, and system design, becoming the key to realizing the "design-right-the-first-time" philosophy.

Based on this, Julin has built SIDesigner, an industry-leading unified system-level SI/PI simulation platform, using the Golden-level precision TRUE-SPICE simulation kernel as its engine. It is dedicated to ensuring signal and power integrity at the source of high-speed, high-density designs.

Unified System-Level SI/PI Simulation Platform

SIDesigner, as a unified system-level SI/PI simulation platform, features a built-in Golden-level precision SPICE engine. It is a signal integrity simulation tool based on a graphical user interface, supporting general circuit simulation composed of common circuit component types, with several key advantages:

· Golden-Level Accuracy and Stability: The SIDesigner platform features the TJSPICE simulation engine, which integrates two core capabilities: True-SPICE time-domain simulation and Channel Simulation. It achieves industry-leading levels in both accuracy and stability.

· Comprehensive Interface Support: In terms of interface support, SIDesigner demonstrates comprehensive compatibility. The platform not only provides complete time-domain simulation solutions for parallel interfaces such as DDR, HBM, and UCIE but also covers mainstream high-speed serial interfaces like PCIE, MIPI, USB, and XSR, ensuring signal transmission quality through professional channel simulation technology.

· System-Level Analysis and Multi-Scenario Coverage: It offers key functions such as system-level power noise analysis, impedance characteristic verification, and cascaded S-parameter extraction. It also supports AC analysis and time-domain transient analysis, meeting simulation requirements for different stages from preliminary design to final verification.

· Continuous Function Upgrades and Co-Growth with Customers

Through in-depth cooperation with customers, SIDesigner continuously enriches its product features and enhances its value, including:

- DFQ Function: Design For Quality, integrating Design of Experiments (DOE), Response Surface Methodology (RSM), and Analysis of Variance (ANOVA) to efficiently seek the optimal system solution in a multi-variable environment. 

- BERC (BER Contour): Combining time-domain simulation and channel simulation technology to predict deterministic performance and random jitter with the highest accuracy, suitable for performance evaluation of high-speed parallel interfaces such as DDR4/5, GDDRx, UCIE, and BOW. 

- RS-Code Function: Precisely simulating the error correction effect of RSFEC in actual channels, providing a basis for system reliability design.

Currently, SIDesigner still has a large number of similar enhancement functions under continuous development and planning, committed to growing together with customers and constantly expanding the boundaries of product capabilities.

Jiaxin Sun stated, "Simulation accuracy is an eternal pursuit." Currently, SIDesigner has been deployed at scale as a sign-off standard in several leading enterprises, becoming an indispensable part of their high-performance design verification process.

Looking ahead, Julin remains committed to its mission of “Simulate a Better Future,” with continued advancements in both circuit and electromagnetic simulation. We will continue to focus on cutting-edge industry needs, deepen collaboration with strategic partners, and introduce new benchmark-setting products. Through sustained technological iteration and ecosystem development, we will connect breakthroughs into integrated solutions and expand them into platform-level capabilities—building world-class EDA solutions from China and contributing to the nation’s rise as a global leader in the EDA industry.