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Zeen Fang

AI FOR EDA · FALL 2027

From device models
to design automation.

I am Zeen Fang, a microelectronics undergraduate at Central South University. I build device and circuit models, connect simulation tools with Codex, and check the results against physical assumptions and controlled comparisons.

I am seeking PhD opportunities for Fall 2027 in AI for EDA, chip design space exploration, and hardware design verification.

TCADCadence VirtuosoPSpiceCodex
Weighted average
89.43 / 100
University certification

RESEARCH PRACTICE

Codex across my research workflow

My current training is in microelectronics and device and circuit modelling. I use Codex to assist with simulation setup, parameter sweeps, data organisation and manuscript preparation in TCAD, Cadence Virtuoso and PSpice. I check the results against physical assumptions and the original outputs.

Conceptual illustration of a semiconductor device, circuit simulation curves, and research notes.
Conceptual research workflow: device and circuit questions, simulation checks, and manuscript preparation.
TCAD

Documented research practice

Device experiments with traceable outputs

Codex helps configure Silvaco ATLAS experiments, organise parameter sweeps, parse logs and prepare figures. I check physical assumptions, solver behaviour and the limits of the extracted metrics.

Read the TCAD workflow
Cadence Virtuoso

Team design and simulation

Circuit verification within a team project

I use Codex to help organise circuit simulation tasks and analyse outputs. The team LDO project provides experience with PVT, PSRR, stability, physical verification and post-layout evaluation.

View the LDO case
PSpice

Ongoing research · manuscript in preparation

State models and controlled comparisons

For my second-order memristor work, I use Codex in model setup, simulation runs, data extraction and manuscript preparation. Matched-state and history-off comparisons help separate the effects of internal states.

See the current model

Each environment retains its own solver. I define the research question and comparison conditions, review the raw outputs, and decide which conclusions the evidence supports.

A closer look: the TCAD case study
Reconstructed H-terminated diamond FET cross-section used in the TCAD research-training project

Codex × TCAD: turning one ATLAS deck into an auditable research workflow

I constrained a Codex harness around local Silvaco ATLAS to turn paper reading, parameterized device sweeps, log parsing, figure generation, and scientific stop rules into one traceable research-training loop.

Codex supported workspace inspection, experiment matrices, parsing, and audits; ATLAS remained the solver, while I owned the physical assumptions, run authorization, stopping rules, and claim promotion.

PROPOSED RESEARCH

PhD Research Interests

I would like to build on my device and circuit modelling experience while learning the computing foundations for AI for EDA. These are proposed research directions that I hope to explore with guidance and further study.

  • AI for EDA

    AI-assisted EDA workflows

    My experience so far is in using Codex to assist device and circuit simulations. I would like to learn how AI can support more of the EDA workflow, starting with small tasks whose outputs I can inspect and compare.

    Starting point · simulation setup and result checking

  • Design space exploration

    Learning design space exploration

    Parameter sweeps in my modelling projects are my starting point. I hope to learn how to choose and compare design parameters more systematically, beginning with simple examples and guidance on suitable optimisation methods.

    Starting point · parameter sweeps

  • Hardware verification

    Learning digital hardware verification

    I am interested in how hardware designs are checked. I would begin with the necessary digital-design and programming foundations, then learn to use simulation and verification tools on small examples.

    Next step · foundations and small practice examples

Research preparation · evidence from prior work

My first-author memristor study trained me to derive operating constraints and compare model predictions with simulation. In the In₂O₃ study, I contributed validation, data curation and manuscript review. The LDO project added experience with team circuit verification. Together, these experiences motivate a move toward automated design exploration with explicit checks.

Evidence I bring

  • Model-to-circuit reasoningPublished first-author memristor studyBehavioral modeling, analytical operating windows, parameter sweeps, and simulation-based validation.
  • Device-to-specification translationPublished In₂O₃ numerical studyInterpreting device assumptions, scaling behavior, capacitance, and parasitic trends as circuit-design constraints.
  • IC workflow exposureTeam LDO competition projectSelected team tasks spanning schematic analysis, physical verification, post-layout evaluation, and semi-discrete hardware testing.

Publications

Academic poster of the memristor read-write interface study, with published figures, analytical design rules and simulation evidence boundaries.
Research poster · open publication page

Memristor-Based Read–Write Interface Design for Neural Networks: A Comparative Study of Linear-Drift and VTEAM Models

Zeen Fang, Mingyang Zhu, Hanbo Xu, and Lei Zhang

First authorModeling, simulation, analysis, and writing

A behavioral-level, pre-silicon study deriving analytical read-write constraints from the VTEAM state equation and evaluating them from device to neural-network scale.

The published study reports a 13.78x resistance window and 90.6% MNIST top-1 accuracy, with 96.08% Set-cycle energy reduction against its defined behavioral baseline.

Journal: JCR Q2Engineering, Electrical & Electronic · 2025 JIF

Academic poster of the In₂O₃ TFT numerical study, with published device figures, scaling results and numerical-only evidence boundaries.
Research poster · open publication page

Numerical Investigation of Short-Channel Effects and RF Performance in Top-Gate In₂O₃ Thin-Film Transistors

Hanbo Xu, Mingyang Zhu, Zeen Fang, and Lei Zhang

Third authorValidation, data curation, and manuscript review

A two-dimensional numerical study of short-channel behavior and simulated DC/RF scaling across 20-700 nm top-gate In₂O₃ TFTs.

My credited roles were validation, data curation, and manuscript review and editing; the highlighted device and RF values are study-level numerical results.

Journal: JCR Q2Instruments & Instrumentation · 2025 JIF

Ongoing Research & Team Engineering

Published work is listed above. Ongoing research and team engineering projects are identified here with their current evidence and status.

A Second-Order Memristor SPICE Model for Neuromorphic Circuit Analysis

Ongoing research · Manuscript in preparation · IEEE TCAS-I target · 2026-present

I am developing a PSpice second-order memristor model that separates a retained conductance state from a relaxing history state, with a power-activated auxiliary state. Matched-x paired-pulse, selected 1T1R, STDP-like, and compact 2 × 2 simulations connect internal-state attribution to circuit-level behavior.

Simulation-only: 11.16% matched-x interval sensitivity versus 1.01% for the separately simulated history-off family; STDP-like ΔG = -1.82% to +1.09%; 24 compact-array read cases with no more than 0.450% unit-range state disturbance. The target denotes planned submission style only.

PSpice implementation diagram showing the memristor P–N interface, shared model core, and separate Norton-state realizations for retained, volatile-history, and power-activated internal states.
Current PSpice implementation · simulation only

Team LDO competition project — Zengyi Huichuang Cup

10th National College Student IC Innovation and Entrepreneurship Competition · 2026

Team project

As a team member, I contributed to selected tasks across the competition stages: a 1.8 V CMOS LDO, eight simulation benches, a physical-verification trail, regional semi-discrete hardware, and national-stage automated-test preparation.

Read the LDO engineering case file
Three-stage LDO concept: a classic PMOS feedback loop for preliminary design; parallel semi-discrete pass branches for the regional final; a LabVIEW dataflow interface and instruments for national-final test preparation.
Preliminary → Regional Final → National FinalView full concept ↗

AI-generated conceptual overview, not the team's implementation schematic or measurement data. The LabVIEW interface illustrates national-final test preparation, not a completed or executable test system.

Selected team contributions under instructor guidance. CMOS work covers design and simulation; regional hardware is a separate semi-discrete LDO; automated testing remained preparation.

Design stages & original technical evidence
  1. 01

    Team design & simulation

    1.8 V CMOS LDO

    SMIC 180 nm transistor-level work covering a PMOS pass device, bandgap reference, folded-cascode error-amplifier path, feedback, bias, and compensation, followed by eight dedicated simulation benches.

  2. 02

    Physical workflow

    Layout-level evaluation

    Top-level layout integration, Calibre DRC/LVS/PEX, and post-layout simulation. The detailed case file keeps the unresolved DRC results and line-regulation gap visible.

  3. 03

    Team hardware task

    Regional-final LDO

    BJT characterization and selection using TIP42C/TIP32C and BD139/BD135 candidates, followed by a 25 V-to-12 V semi-discrete LDO and regulation, stability, transient, and thermal evaluation.

  4. 04

    Preparation only

    Automated test workflow

    IECUBE-3100/3839 and LabVIEW preparation for PWS/DIO/DMM control, voltage-accuracy, line/load-regulation and dropout scans, data logging, and result logic.

Original schematic, layout & simulation figures

Education & Preparation

Central South University

2023.09-2027.06 (expected)

B.Eng. Candidate in Microelectronics Science and Engineering

College of Mechanical and Electrical Engineering

Weighted average: 89.43 / 100

Postgraduate recommendation (推免)Selected for the 2027 preliminary recommendation list

Academic transcript · English public copyStudent ID, gender, and online-verification QR removed. The official copy is available upon request.

Outstanding Student certificate from Central South University for the 2023–2024 academic year.
Outstanding Student · Central South University, 2023–2024

Selected coursework: Semiconductor Device Physics, Circuit Theory, Analog and Digital Electronic Technology, Computer Principles and Architecture, EDA Technology and Application, Signals and Systems, and Large-Scale Integrated Circuit Design.

Modeling & simulation

Semiconductor-device simulation, behavioral circuit modeling, MATLAB, and PSpice.

IC workflow exposure

PVT, PSRR, and STB analysis; layout integration; Calibre DRC/LVS/PEX; post-layout evaluation.

Research practice

Validation, data curation, reproducible analysis, technical writing, LaTeX, and public code sharing.

English: College English Test Band 6 (CET-6), 576.

Academic records · September 2026

Coursework, standing & English proficiency

Chinese and English transcripts, grading scale, weighted average, major ranking, enrolment and the CET-6 score report.

View all seven academic records
September 2026 English academic transcript, with personal identifiers removed.

Selected Honors & Awards

Competition awards, scholarships and student honours.

View all award certificates · 获奖证明 ↗
Full honours list · competitions, scholarships & student awards
  • Second Prize, National Final; First Prize, Central China Regional Final — 10th National College Student IC Innovation and Entrepreneurship Competition, Zengyi Huichuang Track · team award
  • Second Prize, Hunan Division; Excellence Award, National Final — 28th China Robot and Artificial Intelligence Competition, Humanoid Sprint · team awards
  • Honorable Mention, Mathematical Contest in Modeling · team award
  • Outstanding Student, College of Mechanical and Electrical Engineering, Central South University · certificate issued March 2026
  • Third Prize, Central South University Mathematics Competition · Non-Mathematics Category
  • First Prize, Hunan Division, 16th Chinese Mathematics Competition for College Students · Non-Mathematics Category A
  • First Prize, 8th Hunan Provincial College Students Mathematics Competition · Non-Mathematics Category A
  • Excellent Student Award, Highpower International Scholarship
  • Outstanding Student, Central South University
  • Second-Class Academic-Year Scholarship, Central South University

Fall 2027 PhD applications

Open to doctoral research conversations.

I am preparing for doctoral research in AI for EDA, design space exploration and hardware verification. I would be glad to discuss how my microelectronics background, modelling studies and Codex-enabled simulation workflows could contribute to a research project.