Staff PLL Mixed Signal Design Engineer

InnoPhase Inc., DBA GreenWave Radios™, is at the forefront of innovation in Open RAN digital radios. Our cutting-edge solutions, powered by the Hermes64 RF SoC, are designed to enhance network energy efficiency while dramatically reducing operational expenses, with purpose-built silicon that is the heart of ORAN-based active antenna arrays.

Headquartered in San Diego, California, GreenWave Radios™ has established itself as a pioneer in delivering power-efficient digital-to-RF solutions. The company is supported by a talented team of over 100 engineers spread across four global R&D facilities. With an extensive portfolio of more than 120 global patents, GreenWave Radios™ continues to push the boundaries of radio technology and innovation.

To learn more about GreenWave Radios™ and hear what our employees have to say, visit the GreenWave™ certification profile at GreatPlacetoWork.com or explore our Home - GreenWave Radios website.

Staff Engineer, PLL Mixed Signal Design in the RFA Engineering Group, you'll play a critical role in a fast-paced, collaborative environment. You will be deeply involved in various aspects of mixed-signal design, including working with data converters (ADC, DAC, TDC) and digitally controlled analog/RF circuits. This is an excellent opportunity for a motivated individual who enjoys taking ownership of projects and making a significant impact within a smaller, dynamic team.

This role provides an exciting opportunity to contribute directly to developing cutting-edge O-RAN 5G digital radio solutions. If you are passionate about mixed-signal design and want to have a meaningful impact in a collaborative environment, we encourage you to apply.

This position is based in San Diego, CA.

Key Responsibilities:

Contribute to the design and mass production of highly integrated transceivers using deep sub-micron RF CMOS technology

Design high-performance analog components such as PLLs, PFDs, charge pumps, loop filters, VCOs, MMD, dividers, LOs, XTALs, frequency multipliers, and more

Assist with layout activities and perform post-layout LPE simulations and analysis

Collaborate with System Engineers to define block-level specifications based on product requirements

Conduct behavioral model simulations (using Matlab, Verilog) to evaluate system performance and refine block-level specifications

Partner with System Engineers to develop algorithms and methods for mitigating circuit impairments through calibration, compensation, pre-distortion, and other techniques

Work closely with Digital Designers for RTL implementation and validation of proposed methods and algorithms

Collaborate with Test Engineers to define, develop, and implement a comprehensive test plan, including ATE solutions for production ramp-up.

Participate in post-silicon bring-up, performance characterization, optimization, and debugging

Perform testing and verify product performance using lab instruments

Prepare and present clear, concise design-related documentation Job Requirements:

MSEE with 10+ years of experience in high-performance RF and mixed-signal IC design using advanced CMOS processes

Experience designing mass-produced, highly integrated transceivers using deep sub-micron RF CMOS technology

Strong understanding of RF transceiver architectures and their trade-offs

Excellent knowledge of RF CMOS fundamentals, including transistor-level design and implementation of fractional-N PLLs, sigma-delta PLLs, VCOs, etc.

Expertise in loop design optimization for parameters like phase noise/jitter, spurs, locking time, and area

Deep understanding of CMOS device operation and construction

Familiarity with IC layout, full IC design flow, and verification

Strong analytical, problem-solving, and intuitive skills with attention to detail and a commitment to quality

Hands-on experience with evaluating silicon on the bench and making precise measurements using typical lab equipment

Proficiency in using development tools such as Cadence Virtuoso suite, EMX, Calibre, PVS, Matlab, and PERC

Ability to work efficiently in a team, with a strong sense of urgency to meet product timelines

Ability to work independently and manage multiple tasks simultaneously Desirable Skills:

Experience working with multi-site teams

Excellent written and verbal communication skills, with the ability to clearly explain circuit and system design decisions in both internal and external documentation

Direct experience with 4G/5G, WiFi and Bluetooth products is preferred