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Flux Computing · 5 months ago

Analog Mixed Signal Design Engineer

Austin, TX

Full-time

Onsite

Senior Level, Lead/Staff

$194K/yr - $270K/yr

7+ years exp

Flux Computing is searching for a Senior/Staff Analog Design Engineer to architect, design, and bring to production ultra-high-speed CMOS ADCs and DACs. The role involves defining converter architectures, designing high-speed building blocks, and collaborating with various teams to ensure successful integration into optical compute fabric.

Artificial Intelligence (AI)HardwareMachine LearningManufacturingOptical Communication

H1B Sponsored

Responsibilities

Define converter architectures that will deliver on the target of Analog bandwidth > 20 GHz

Design critical high‑speed building blocks: bootstrapped or switch‑linearised T/H, low‑skew clock trees (< 50 fs rms aperture jitter), broadband input buffers, thermometer and binary‑weighted current cells, dynamic element matching (DEM) and background calibration loops

Model and close performance using transistor‑level and behavioural co‑simulation (SpectreRF / AFS RF + Verilog‑A/AMS), then drive post‑layout extraction, EM/IR and thermal analysis to achieve first‑silicon success

Collaborate with packaging, SerDes and PLL teams to co‑design I/O impedance, ESD, supply isolation and on‑interposer routing so converters integrate cleanly into multi‑lane fabrics

Lead silicon bring‑up: on‑wafer static and dynamic tests, high‑speed digitiser / AWG measurements, DNL/INL, static‑power and jitter transfer characterisation; oversee production test pattern generation and built‑in self‑test (BIST) hooks

Mentor junior engineers, conduct rigorous design and layout reviews, and publish internal app‑notes to disseminate best practices for GHz‑class data‑converter design

Track and inject into the team the latest advances in time‑interleaving calibration, background mismatch correction, supply‑noise tolerant reference generation and layout techniques

Qualification

CMOS data-converter designAnalog bandwidth > 20 GHzLow-jitter sampling circuitsBroadband front endsCadence VirtuosoSpectreRF / AFS RFVerilog-A/AMSHigh-speed AWG/BERT operationCross-disciplinary collaborationCommunication skills

Required

7 + years of production CMOS data‑converter design, with at least two tape‑outs running ≥ 20 GHz analog bandwidth

Deep knowledge of track‑and‑hold linearity, aperture‑jitter minimisation, current‑steering DAC glitch energy reduction, capacitor and device matching, and metastability‑hard comparators

Proficiency with industry EDA flows: Cadence Virtuoso, SpectreRF / AFS RF, Verilog‑A/AMS, EMX / HFSS for package + on‑chip inductor modelling, and mixed‑signal verification

Demonstrated ability to achieve < 100 fs rms aperture jitter, < 0.5 LSB DNL/INL (post‑calibration), and low‑ppm clock‑to‑data skew in silicon

Experience incorporating digital calibration engines (DSP or µ‑controller‑driven) for offset, gain, timing and element‑mismatch correction

Solid grasp of supply‑noise coupling, substrate isolation, ESD, latch‑up, and advanced‑node layout techniques (double patterning, EUV constraints, local interconnect)

Strong lab skills: high‑speed AWG/BERT operation, FFT‑based dynamic testing, de‑embedding, and scripting (Python / MATLAB) for data reduction

Bachelor's degree in Electrical Engineering or related field (Master's / PhD preferred)

Excellent communication, cross‑disciplinary collaboration, and a demonstrated ability to execute quickly in innovation‑driven environments

Preferred

Master's / PhD in Electrical Engineering or related field

Benefits

Competitive stock options, you’re not just part of the journey, you will own a piece of it.

We offer financial and operational relocation support (US and abroad), through a dedicated third-party provider who is on hand to make your move to Austin as seamless as possible.

We offer visa sponsorship so if we make you an offer we will make every reasonable effort to secure you a visa, but we may not be able to sponsor visas for every role and candidate.

We’re in the process of setting up a US group policy once we have 5+ employees. In the meantime, we’re providing a health insurance stipend of $800/month to offset costs. Once the group policy is live, Flux will cover 100% of the employee premium, and offer options like dental, vision and life insurance with an aim to remain competitive among Austin tech and start up employers.

We offer US employees access to a 401(k) retirement savings plan and we plan to introduce an employer match in line with Austin tech market norms (commonly in the 4-5% range). Our goal is to keep our retirement benefits competitive while we scale.

Top of the line, high-spec tech for everyone.

Sony noise-cancelling headphones and ergonomic setups to keep you comfortable and focused.

Personal company card to spend on tools that help you do your job - like ChatGPT Pro or anything else that boosts your workflow.

Periodic travel to London HQ and regular team socials.

33 days of paid time off (PTO), including US federal holidays.