Digital circuit schematic
A complete schematic with proper termination, decoupling, and level translation.
Digital and Mixed-Signal Design
High-speed digital design built for clean timing and signal integrity
I design high-speed digital and mixed-signal boards for signal processing, communication interfaces, and control systems, optimized for speed, power efficiency, and reliability.
20+ years experience
Clients in 15+ countries
Bench-tested in-house
No strings attached
20+
years of professional electronics design
20+ yearsIn electronics design
15+Countries served
Concept to prototypeEnd to end delivery
In-house labBench-verified, not just simulated
Why it matters
At today's clock speeds, digital design is an RF problem in disguise.
Modern digital design goes far beyond connecting logic gates. As clock speeds increase and process geometries shrink, digital circuits face challenges that were once the exclusive domain of RF engineering: signal integrity, power distribution, and electromagnetic compatibility all demand careful attention to succeed. I design each board around its specific requirement, whether that is maximum performance, minimum power consumption, or highest reliability, so it meets its specifications the first time. This includes FPGA design and high-speed digital work where DDR memory, high-speed serial links, and signal integrity on a multilayer stackup all have to close timing in the real board, not just in simulation.
What you get
A complete digital design package, ready to fabricate
Every engagement is delivered with the analysis and documentation you need to move confidently from schematic to a working board.
Timing analysis
Setup and hold time analysis for all critical interfaces.
Signal integrity simulation
Eye diagrams, crosstalk analysis, and reflection analysis for high-speed signals.
Power analysis
Current consumption estimates and power distribution network design.
Layout constraints
Detailed routing guidelines including length matching, spacing, and layer assignments.
Interface documentation
Timing diagrams, protocol specifications, and interface control documents.
Test coverage plan
Boundary scan support (JTAG) and design-for-test features.
What it prevents
The high-speed failures that professional digital design avoids
Timing violations
Setup and hold time failures causing intermittent data errors.
Signal reflections
Improper termination causing overshoot, undershoot, and ringing.
Crosstalk
Coupling between adjacent signals causing false triggers or data corruption.
Ground bounce
Simultaneous switching noise (SSN) affecting logic thresholds.
Power integrity
Voltage droops during high-current transients.
EMC problems
High-speed digital signals becoming unintentional radio transmitters.
How it works
From interface definition to a validated board
1
Interface definition
I define all digital interfaces, their protocols, timing requirements, and voltage levels, and identify critical paths and performance constraints.
2
Architecture design
I select appropriate logic families, buffers, and interface components, then plan clock distribution and reset strategies.
3
Schematic implementation
Detailed schematic capture with proper termination schemes, decoupling strategy, and level translation where needed.
4
Signal integrity analysis
Pre-layout simulation to verify termination strategy and identify potential signal integrity issues before PCB design.
5
Verification
Post-layout simulation confirms timing margins, and prototype testing validates signal quality and timing under worst-case conditions.
Who does the work
George Saliba
An electronics design engineer with 20+ years of professional experience across analog, digital, RF, and power designs, delivered to clients in 15+ countries. Your project is handled by the person who has shipped hardware like it, start to finish.
See the project portfolio
Questions
Frequently asked
What digital design do you take on?
High-speed digital and mixed-signal boards: processors and FPGAs, memory, communication interfaces and high-speed buses, designed for signal integrity and reliable timing.
How do you handle signal integrity?
With controlled impedance, length matching, proper return paths and stackup design, checked against the interface requirements rather than left to chance.
Can you design a board around a specific processor or FPGA?
Yes. Naming the platform you want, such as a particular MCU, FPGA or module, is a good starting point and I design the surrounding hardware around it.
Do you deliver a tested board?
Yes. I take it through bring-up and bench testing in my lab so the high-speed interfaces are confirmed working.
Do you do high-speed digital and signal integrity work such as DDR, PCIe, and USB3?
Yes. High-speed digital design with FPGAs, DDR memory interfaces, and high-speed serial links is core work, with controlled impedance, length matching, and signal integrity analysis so the interfaces close timing on the manufactured board rather than only on paper.
Ready when you are
Ready for high-speed digital design?
From simple logic interfaces to high-speed memory systems, professional digital design ensures reliable operation at target speeds.
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