RF Calibration Engineer

3 weeks ago

Bengaluru, India L&T Semiconductor Technologies Full time

We are seeking a skilled and experienced RF Calibration Engineer with hands-on expertise in Qualcomm cellular platform to lead and execute RF calibration activities including RFC card generation, QCN/XQCN handling, and RF tuning. The candidate will play a critical role in ensuring optimal RF performance across LTE, GPS, Wi-Fi, and Bluetooth subsystems.


Areas Of Responsibility

  • Perform RF calibration for cellular platforms based on Qualcomm SoCs (e.g., QCM, QCS, SA2150, SA415M, SDX series, QCX series)
  • Generate and update RFC (Radio Frequency Configuration) cards for factory and production use
  • Handle QCN/XQCN backup, editing, and restoration for RF parameter tuning
  • Conduct calibration procedures using Qualcomm toolchain: QPST, QXDM, QDART, QCAT, and QMSL
  • Analyze and debug RF logs, NV configurations, and RF signal performance
  • Coordinate with hardware and modem teams to optimize antenna and RF path
  • Support EFS/NV management, RF provisioning, and board-level bring-up
  • Automate repetitive tasks using Python/Perl scripts for efficiency in calibration and flashing
  • Maintain documentation and traceability for RF performance and test results

Experience and Qualification

Experience: 5 to 10 yrs

  • Solid hands-on experience with Qualcomm RF calibration tools and procedures
  • Experience with multiple Qualcomm chipsets (e.g., QCM2290, QCS2290, QCX216, SA415M, SDX55, etc.)
  • Deep understanding of LTE/4G/5G, GNSS, Bluetooth, and Wi-Fi RF subsystems
  • Familiarity with NV item editing, eFuse programming, and RF tuning principles
  • Strong background in wireless testing, calibration lab tools, and scripting automation
  • Bachelor's or Master's degree in Electronics, Telecommunications, or relevant discipline

Qualifications:

  • Prior experience with mass production RF calibration and automation
  • Exposure to carrier certification (PTCRB, GCF, operator-specific requirements)
  • Familiarity with SAR/TRP/TIS testing, antenna design, and tuning practices
  • Knowledge of eSIM/eUICC, security provisioning, and factory test flows
  • Experience with Qualcomm’s Diag protocol, QCN tools, and RF trace analysis

Technical And Behavioural Skills

Technical Skills :

Qualcomm Tools & Platforms:

  • QXDM – Log capture, RF trace analysis, event monitoring
  • QPST/QFIL – EFS access, QCN flashing, QPST server tools
  • QCAT – Log post-processing and NV item analysis
  • QDART – RF calibration and automation interface
  • QMSL (Qualcomm Modem Software Library) – Used for scripting RF calibration routines
  • RFNV Tool / QCN Manager / NV Manager – NV editing and configuration
  • RF Card Tool / RFC Generator – RFC card creation, editing, and validation
  • eFUSE Tools – eFUSE blowing for platform security and production configuration

Calibration & Testing:

  • RF Calibration – LTE/4G/5G, GNSS (GPS/GLONASS), Bluetooth, Wi-Fi
  • QCN/XQCN Handling – Backup, edit, restore NV configurations
  • EFS Management – File system access for provisioning and NV injection
  • RF Tuning & Optimization – Gain table tuning, PA bias, switch path config
  • Production Calibration Flow – Factory-line calibration using automation scripts
  • Carrier Certification Support – TRP/TIS/SAR data generation, PTCRB, GCF

Modem & Protocol Stack Knowledge:

  • LTE Bands, Band combinations, Carrier Aggregation
  • Diag protocol & diagnostic message decoding
  • Call flow understanding: Attach, RRC, PDP contexts
  • NV item structure and interdependencies

Behavioural Skills:

  • Strong communication and teamwork skills.
  • Ability to adapt to a fast-paced and dynamic business environment.
  • Detail-oriented with a focus on quality and accuracy.
  • Proactive and self-motivated with a results-oriented mindset.

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