Roles / Clock Tree Synthesis Engineer

Clock Tree Synthesis Engineer

PD-005v1

Physical Design & ImplementationImplementationIC3–IC6Individual contributor

Also known as: CTS Engineer; Clock Distribution Engineer; Clocking Implementation Engineer

See this role on the SoC lifecycle or on the Soft IP lifecycle

Summary

Builds the on-chip clock distribution so that skew, latency, jitter, and clock power meet targets across all modes and corners without creating hold or OCV exposure.

A day in the life

Work in progressNo day-in-the-life description has been written for this role yet. If you do this work, we would welcome yours. Suggest a source or a correction

Responsibilities

Lines tagged General are the Hub's general description of this kind of role, used where the role register has no entry yet. They are kept under review and will be refined.

Project

Work done for a product or program.

Define the clocking architecture per block including root selection, mesh versus tree versus H-tree topology, and skew groups.
Author CTS specifications covering target skew, insertion delay, transition limits, and buffer cell lists.
Run concurrent clock and data optimisation to trade useful skew against setup and hold margins.
Balance clock trees across multiple modes and clock domains including test and functional mux structures.
Insert and verify clock gating cells, clock dividers, and glitch-free clock mux structures physically.
Apply shielding, non-default routing, and via redundancy to clock nets to control crosstalk and EM.
Analyse clock jitter, duty-cycle distortion, and OCV/AOCV/POCV derating impact on timing closure.
Reduce clock network power by tuning buffer sizing, level-based gating, and root gating strategies.
Verify clock tree quality with clock tree reports, latency histograms, and cross-corner skew analysis.
Debug clock-related hold failures and reconvergence pessimism issues with the STA team.

Function

Work that keeps the discipline running: methods, tools, suppliers and people.

Maintain implementation flows, scripts and sign-off checklists.General
Work with EDA vendors and the CAD team to fix tool issues and improve results.General
Feed lessons from each tapeout back into flows and guidelines.General

Major tasks

Project

Produce and hand over the role's key deliverables
- Clock tree specification and CTS constraint files
- Balanced clock trees with skew and insertion-delay reports per mode
- Clock network power breakdown
- Clock routing shielding and NDR configuration
- CTS methodology guidelines for the block family
Implement the layoutGeneral
- Floorplan and plan the power grid
- Place, build the clock tree and route
- Run extraction and analysis
Close sign-offGeneral
- Close timing at every corner
- Clear DRC and LVS
- Complete the sign-off checklist

Function

Maintain the flowGeneral
- Update scripts and flow settings
- Qualify new tool versions
Share knowledgeGeneral
- Document fixes for recurring issues
- Train newer engineers on the flow

Works with

Physical Design Engineers
STA Engineers
Low-Power Implementation Engineers
DFT Engineers
PLL/Analog Designers
Signal Integrity Engineers

Typical backgrounds

BS/MS in Electrical Engineering; 3–10 years in digital implementation with dedicated clocking ownership.

Demand signal

0 open listings right now
0 Talent Wafer employer inquiries

Counts live listings tagged to this role, and employer interest in candidates from Talent Wafer runs for this role (all runs to date). Hub activity only, not the wider market.

Comp tier (within semis)

3 / 5

Remote feasibility

Medium

Semis core vs. portable

Core semiconductor-only

Geographic hotspots

Bangalore, Austin, Santa Clara, Hsinchu, Haifa, Shanghai, Seoul, Munich

Certifications / standards training

—

Transfers to (industries)

High-speed PCB clock distribution design; limited transfer beyond hardware engineering

Risk if vacant

Clock skew and insertion delay go uncontrolled, creating widespread hold failures and clock power overruns that block timing signoff.

Clock Tree Synthesis Engineer

Summary

A day in the life

Responsibilities

Project

Function

Major tasks

Project

Function

Works with

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