Pallab Dutta
Hyderabad
Summary
Highly skilled and experienced Principal Engineer specializing in Mobile Frontend architecture designs with Qualcomm Chipsets (reference designs). Proven track record of leading large teams to specify, design, and integrate complete frontend architectures. Expertise in tackling complex technical problems in RF Front End architectures, SOC, 5G NR, hardware integration, RF convergence, and coexistence issues with WLAN, BT/BLE, GNSS, and UWB.
Key Strengths:
- Leadership: Successfully led teams in designing and integrating mobile frontend architectures.
- Technical Expertise: Deep knowledge of RF Front End architectures, SOC, 5G NR, and hardware integration.
- Problem-Solving: Passionate about solving complex HW system issues and innovating in system testing.
- Industry Experience: Extensive experience as a Qualcomm technical lead in mobile frontend design, integration, subsystem testing, and platform CS roles.
- Subject Matter Expert: Expertise in mobile frontend RF HW solutions and driving cellular system architectures for major smartphone OEMs.
Achievements:
- Led the design and integration of mobile frontend architectures currently used by major smartphone OEMs.
- Solved complex coexistence and interference challenges to deliver optimal wireless user experiences.
Overview
20
20
years of professional experience
Work History
Principal Engineer
Qualcomm India Pvt Ltd
04.2015 - Current
- Design and development of mobile frontend designs using Qualcomm Chipset (reference designs) supporting NR, LTE, WCDMA & GSM
- Reference designs include Global markets and China Specific
- RF HW design lead with experience of leading big team across multiple chipsets
- Functional block implementation of the overall RF system
- Work with RF system team to analyze the block diagram
- System level analysis of the CA combos, link budget calculations
- Enhanced product quality by conducting thorough analysis and identifying areas for improvement.
- Applied development best practices in daily tasks for efficiency and accuracy.
- Optimized engineering processes by implementing innovative solutions and streamlining workflows.
- Implemented rigorous testing protocols to ensure compliance with industry standards as well as customer specifications.
- Review design deliverables
- Technical Mentoring the team from RF Card bring-up till the completion of DVT
- Tools: Mentor Expedition, HFSS, ADS, Qualcomm tools
Assistant Consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- Provided design services to Qualcomm India team
- Worked on design and development of phone frontend RF card that supports major technologies like GSM, CDMA, LTE etc
- RF Card bringup and RF cal/Char enablement
- DVT of band/techs. Owning up LTE tech and work with RF Subsystem teams and resolve the HW issues
- Hardware CS DVT
- Tools: Call Box, Network analyzer, Spectrum analyzer, Signal Generator, ADS
- Improved client satisfaction by providing thorough and timely project updates and addressing concerns promptly.
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- Provided design services to Qualcomm USA team
- Worked on design and development of phone frontend RF card that supports major technologies like GSM, CDMA, LTE etc
- RF Card bring-up and RF calibration fixes
- Complete ownership of GSM implementation
- FE optimization, fixing timing related NV items, Temp-comp NV
- Implemented the FE harmonic trap for both HB and LB GSM
- Debugged and optimized the voltage drop across the SMPS which inturn improved the power margin for the GSM LB and fixed the ORFS SW issue
- Worked on BC0-B13 SV, matched the Dup-Combo solution and resolved the BC0 in-band spur coming from the LTE side
- Tools: Call Box, Network analyzer, Spectrum analyzer, Signal Generator, Transmitter tester, Mentor Graphics
- Improved client satisfaction by providing thorough and timely project updates and addressing concerns promptly.
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- Provided design services to Qualcomm USA team
- Worked on design and development of phone frontend RF card that supports major technologies like GSM, CDMA, LTE etc
- RF Card bring-up and RF calibration fixes for all the three variants of the design
- Complete ownership of LTE bands including the FE optimization
- Implemented the full 196MHz LTE 41 and the major challenge was to optimize the ACLR across the entire band
- Implemented APT optimization for all the LTE bands
- Worked on the final DVT and data release
- Tools: Call Box, Network analyzer, Spectrum analyzer, Signal Generator, Transmitter tester, Mentor Graphics
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- Provided design services to Qualcomm US IPS team
- Worked on design and development of phone frontend RF card that supports major technologies like GSM, CDMA, LTE etc
- Worked on GSM
- Fixing the RxBN spurs coming from the PMIC
- Implemented the fix on 3 different RF card with consistent data
- Implemented temp-comp
- Worked on GSM harmonic and spurios issue
- Tools: Call Box, Network analyzer, Spectrum analyzer, Signal Generator, Transmitter tester, Mentor Graphics
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- The client was developing RF boards for LTE 900MHz BTS Radio Head
- The project scope involved fixing the biasing current and optimizing the matching network of the RF amplifier stages, small signal analysis and linearity analysis of the TX line-up, Feed back path line-up analysis and mark up the schematic for the changes in design
- Analysis of the active bias circuit of the RF amplifier for the biasing current, change in the current source circuit to fix the bias current for proper mode of operation
- Matching circuit optimization of the RF amplifier stages
- Redesign of the matching circuit using ADS for the maximum gain, gain flatness and OIP3
- Small signal analysis, Stability Analysis and Linearity analysis of the Individual RF amplifier stages at room temperature and over temperature
- TX line-up analysis for gain, gain variation and linearity over temperature
- Feed back path line-up analysis for gain and gain variation over temperature
- Mark up the schematic for the design changes made to the TX line-up
- Tools: ADS, Network Analyzers, Spectrum Analyzers, Signal Generator
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- The project scope involved debugging of failures and RF certification testing of the 2.3 GHz WiMAX (802.16e) 5 watt Linear Power Amplifier board
- Small signal S-parameter analysis of the LPA board
- The testing includes Final Device only and Cascaded PA (with backend circuits)
- Large signal analysis of the PA board which includes CW gain variation with drive-up, Pulsed P1dB verification, Harmonic and Intermodulation product level measurements
- Analysis of ACPR and RCE degradation using 75% OFDMA signal
- Stability analysis
- Mu-factor stability and Gross stability
- Power Detector circuit characterization on the PA board
- Verification of the Backend Circuits which includes Insertion loss, Input & Output Return Loss and Isolation measurement
- Tools: Network Analyser, Spectrum Analyser, Signal Generator, Power Meter
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
- The project was a redesign of Synthesizer Module (lsm6 package)
- The major change includes PLL IC and the Regulator IC
- The scope was to identify the design change, incorporating changes in schematic and layout and qualification testing and debugging of prototype modules, major design issue resolution and final qualification testing
- Worked on Test Plan and Test Setup for qualification testing at RT and over temperature
- Characterized the VCO in free running mode to verify the VCO sensitivity drifts over temperature
- Qualification testing includes synthesizer frequency range verification, PLL Lock test, Phase Noise Measurement, Spurious and Harmonic measurement, and Transient Analysis
- Resolved the failure observed in transient analysis during frequency hopping up at high temperature
- Increased the VCO sensitivity to reduce to probe voltage and hence reducing the noise incorporated by the PLL IC
- Tools: Signal Source Analyzer, Frequency Counter, Agilent Runtime Test automation tool
RF Design Engineer
VXL Technologies Ltd.
12.2004 - 04.2007
- Company Overview: (India)
- Design and development of RF Synthesized signal generator 10 KHz to 2GHz having internal and external modulation and complex modulation
- Worked on System line-up analysis for Gain, Signal Level, Gain Flatness and Phase Noise
- Designed and debugged the UHF synthesizer (500M-1000M)
- Worked on the design of Microstrip Bandpass filter (Combline) used to suppress the Harmonics and Sub-harmonics generated by the Frequency Doubler
- Complete EM-simulation of the frequency Doubler circuit with BPF
- Implemented Automatic Gain Control circuit using voltage variable attenuator (HMC346) and Log slope RF detector from Analog Devices
- Final amplifier board design using monolithic amplifiers
- Performed EM co simulation
- Implemented gain equalizer with 4dB positive slope to equalize the gain variation of the broad-band monolithic amplifiers
- (India)
- Tools: AWR Microwave Office RF Design Tool, PADS, Network Analyzer, Spectrum Analyzer
RF Design Engineer
VXL Technologies Ltd.
12.2004 - 04.2007
- Company Overview: (India)
- Design and development of up/down converter module in the L-band frequency range having two different IF frequencies 50MHz or 70MHz
- The overall conversion loss of the system was -8dB
- Worked on Complete line-up analysis of gain, output level and analysis of the mixer Intermodulation products
- Implemented the PLL synthesizer including testing and debugging
- Design of the Tunable Microstrip Bandpass filter (Combline) using Infineon varactor diode
- (India)
- Tools: Agilent ADS, PADS, Network Analyzer, Spectrum Analyzer
Education
M.Tech - Radiophysics & Electronics, Microwave Communication
University of Calcutta
10.2004
B.Tech - Radiophysics & Electronics, Electronics & Communication
University of Calcutta
07.2002
Skills
- Technical leadership
- Teamwork and Collaboration
- System Architecture design
- Customer Focus designs working with PDM and CE
- Workflow Coordination
- RF issues debugging ( System HW/SW integration)
- Technical mentoring and team building
- Document Review
Personal Information
- Nationality: INDIAN
- Marital Status: Married
Timeline
Principal Engineer
Qualcomm India Pvt Ltd
04.2015 - Current
Assistant Consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
Assistant consultant (RF HW Engineer)
Tata Consultancy Services Ltd.
05.2007 - 03.2015
RF Design Engineer
VXL Technologies Ltd.
12.2004 - 04.2007
RF Design Engineer
VXL Technologies Ltd.
12.2004 - 04.2007
M.Tech - Radiophysics & Electronics, Microwave Communication
University of Calcutta
B.Tech - Radiophysics & Electronics, Electronics & Communication
University of Calcutta
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