Signal Integrity Engineer

As a hardware signal integrity engineer you will develop, extract and simulate PCB structures to ensure that the high speed SERDES(112Gbps) and DDR interfaces perform correctly within the system budget.
You will work closely with the PCB and package substrate CAD engineers to design component signal launches from BGA components and connectors, layer transition via structures, and cable interconnect. You will define the low-loss materials to be used for future designs and work closely with Graphcores system architecture team and suppliers to ensure the best possible performance is achieved. You will be an expert user of high speed PCB simulation tools and be familiar with industry best practice in high speed digital system design.
The Team
Graphcores Hardware Engineering Team creates both products for sale in volume production and hardware test & validation systems based on Graphcores IPU processor.
These systems allow Graphcores customers to develop leading-edge machine-leaning solutions for training and inference.
Responsibilities and Duties
Signal and Power Integrity specialist for the development of production systems and test boards for Graphcores family of processors.
Includes:

Development of printed circuit board structures for high frequency (112Gbps, 16Gbps) SERDES interfaces, DDR interfaces
PCB stackup definition
System, PCB and substrate level simulation and analysis of signal and power integrity
Graphcore Integrated Circuit device interface requirements definition, tool & vendor relationships
PCB design requirement and constraint definition, PCB layout supervision
Prototype bring-up, evaluation, validation & system test

5+ years experience in high-speed digital circuit development, with a deep understanding of signal and power supply integrity
Knowledge of high-speed circuit design requirements to ensure signal integrity and robust rejection of interference and crosstalk is essential
Experience of high frequency (tens of GHz) SERDES design and validation
Experience with ANSYS SIWave, HFSS, and/or Mentor Hyperlynx Signal and Power Integrity tools
High speed processor system design with experience in interfaces such as SERDES, PCI, DDR, Ethernet, etc.
Design of BGA & connector pad launches, via structures and transmission lines for GHz signals.
This position will require extensive practical work in the lab, bringing up, debugging and validating designs
Expertise in the use of vector network analysers, high speed digital oscilloscopes, signal generators
A rigorous approach is required to make sure designs will work correctly the first time
Independent working and the taking of responsibility, with excellent cooperative and communications skills to work in a small team environment
Experience working in a small team, which requires a wide range of skills, an eagerness to participate in all parts of the development cycle from concept to testing in the lab and supporting manufacture and customers.

About Graphcore
How often do you get the chance to build a technology that transforms the future of humanity?
Graphcore products have set the standard in made-for-AI compute hardware and software, gaining global attention and industry acclaim. Now we are developing the next generation of artificial intelligence compute with systems that will allow AI researchers to develop more advanced models, help scientists unlock exciting new discoveries, and power companies around the world as they put AI at the heart of their business.
Graphcore recently joined SoftBank Group bringing large and ongoing investment from one of the worlds leading backers of innovative AI companies.

In addition to a competitive salary, Graphcore offers flexible working, a generous annual leave policy, private medical insurance and health cash plan, a dental plan, pension (matched up to 5%), life assurance and income protection. We have a generous parental leave policy and an employee assistance programme (which includes health, mental wellbeing, and bereavement support). We offer a range of healthy food and snacks at our central Bristol office and have our own barista bar! We welcome people of different backgrounds and experiences; were committed to building an inclusive work environment that makes Graphcore a great home for everyone. We offer an equal opportunity process and understand that there are visible and invisible differences in all of us. We can provide a flexible approach to interview and encourage you to chat to us if you require any reasonable adjustments