RF Calibration Engineer

7 hours ago

Bengaluru Karnataka India, Karnataka 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 ResponsibilityPerform 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 useHandle QCN/XQCN backup, editing, and restoration for RF parameter tuningConduct calibration procedures using Qualcomm toolchain: QPST, QXDM, QDART, QCAT, and QMSLAnalyze and debug RF logs, NV configurations, and RF signal performanceCoordinate with hardware and modem teams to optimize antenna and RF pathSupport EFS/NV management, RF provisioning, and board-level bring-upAutomate repetitive tasks using Python/Perl scripts for efficiency in calibration and flashingMaintain documentation and traceability for RF performance and test resultsExperience and QualificationExperience: 5 to 10 yrs Solid hands-on experience with Qualcomm RF calibration tools and proceduresExperience with multiple Qualcomm chipsets (e.g., QCM2290, QCS2290, QCX216, SA415M, SDX55, etc.)Deep understanding of LTE/4G/5G, GNSS, Bluetooth, and Wi-Fi RF subsystemsFamiliarity with NV item editing, eFuse programming, and RF tuning principlesStrong background in wireless testing, calibration lab tools, and scripting automationBachelor's or Master's degree in Electronics, Telecommunications, or relevant disciplineQualifications:Prior experience with mass production RF calibration and automationExposure to carrier certification (PTCRB, GCF, operator-specific requirements)Familiarity with SAR/TRP/TIS testing, antenna design, and tuning practicesKnowledge of eSIM/eUICC, security provisioning, and factory test flowsExperience with Qualcomm’s Diag protocol, QCN tools, and RF trace analysisTechnical And Behavioural SkillsTechnical Skills :Qualcomm Tools & Platforms:QXDM – Log capture, RF trace analysis, event monitoringQPST/QFIL – EFS access, QCN flashing, QPST server toolsQCAT – Log post-processing and NV item analysisQDART – RF calibration and automation interfaceQMSL (Qualcomm Modem Software Library) – Used for scripting RF calibration routinesRFNV Tool / QCN Manager / NV Manager – NV editing and configurationRF Card Tool / RFC Generator – RFC card creation, editing, and validationeFUSE Tools – eFUSE blowing for platform security and production configurationCalibration & Testing:RF Calibration – LTE/4G/5G, GNSS (GPS/GLONASS), Bluetooth, Wi-FiQCN/XQCN Handling – Backup, edit, restore NV configurationsEFS Management – File system access for provisioning and NV injectionRF Tuning & Optimization – Gain table tuning, PA bias, switch path configProduction Calibration Flow – Factory-line calibration using automation scriptsCarrier Certification Support – TRP/TIS/SAR data generation, PTCRB, GCFModem & Protocol Stack Knowledge:LTE Bands, Band combinations, Carrier AggregationDiag protocol & diagnostic message decodingCall flow understanding: Attach, RRC, PDP contextsNV item structure and interdependenciesBehavioural 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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