Hashimi Hussain

R&D - Vector Network Analyzers RF Systems Design RF Systems Integration RF/Microwave circuit design RF measurements

R&D - RF/ Microwave & sub-THz Power Sensors

Master Thesis - Design of D-Band Transmitter Front-End Building Blocks in 130nm BiCMOS Technology. A 110-170 GHz mmWave Phased-array Tx/Rx front-end building blocks are designed for 6G Communications, Radars, and Imaging in 130 nm SiGe BiCMOS Technology covering the entire 60 GHz Bandwidth of D-Band (43% Relative Bandwidth) - Design, layout, and tape-out of the following blocks: - A 110-170 GHz Phase-Invariant Variable Gain Amplifier for analog beamforming - A 4-bit DAC Analog-Mixed signal block as gain control circuitry for VGA - Design of 3 different versions of D-Band Power Amplifiers - Design of Frequency Quadrupler for on-chip LO generation - 2x Active SPDT switches for TTD circuit - A Broadband True Time Delay(TTD) Phase Shifter for beam steering - Design of FMCW Radar Transmitter - Design of D-band Phased Array Transmitter for Wireless Communications. - Modeling and design of Broadband Marchand Balun, pads, on-chip passives (Inductors, Capacitors, Transmission Lines(microstrip, CPW, Coupled Lines), Transformers), high-frequency ESD structures through EM-Simulation (ADS Momentum) - Physical Verification of the designed IC blocks (Assura LVS, DRC) - The tasks are performed in IHP's 130nm SiGe: C BiCMOS technology with fT/fmax = 300/500 GHz - The following tools were used for the design: - For mmWave design of IC blocks - Keysight ADS, For EM Simulation - ADS Momentum 3D Planar EM-Simulator - For IC Layout, Physical Verification, and Tapeout in GDSII - Cadence Virtuoso Schematic Editor(L/XL), Virtuoso Layout Suite(L/XL)

Design of RF Low Noise Amplifier at 2.4 GHz ISM band in SiGe HBT technology - The LNA achieved an NF of 0.9 dB and a Gain of 11 dB - Small-signal design, optimization, and verification of a low-noise RF amplifier - Design in Keysight ADS design environment, EM-schematic co-simulation in Keysight ADS Momentum - RF PCB Layout designed in KiCAD - Robustness optimization by means of sensitivity analysis and Monte Carlo simulation - Soldering of SMD components, assembly of the designed low noise amplifier

- This project deals with the system design for a geostationary satellite ground terminal. - Compile and document system requirements (Link Budgeting for the satellite ground station). - Transmitter system-level design (power amplifier output/antenna gain trade-offs). - Receiver system-level design (LNA noise figure/antenna gain trade-offs). - Recommendations for uplink/downlink antenna, up/down-converters, stabilized local oscillator subsystem for downconverter.

Design of Second Order Discrete-Time Sigma-Delta ADC in 90nm CMOS - This project involves the design of a 2nd order Sigma-Delta ADC in 90nm CMOS technology, achieving 67 dB SNDR, 25 kHz BW, OSR 64, and total power consumption of 1.9 mW - The following IC blocks are designed: - Design of beta-multiplier voltage reference, Biasing Networks - Multistage Differential Amplifier(a 2-stage folded cascade differential amplifier) Op-Amp - Implementing test benches for the op-amp (STB analysis) - Design of a Sample and Hold Circuit, Switched-Capacitor Integrator - Design of non-overlapping clock generator, T-Gate Switches, Preamplifier, High-Speed Comparator(strong-arm Latch) - Design and Optimization in Cadence Virtuoso Schematic Editor, Virtuoso Spectre Circuit Simulator, and Virtuoso Analog Design Environment

Design and Optimization of Vivaldi antenna array for FMCW Radar. - Radar system design and link budgeting of the FMCW radar system. - Design of feeding network for the Antenna array. - A gain of 12 dB with bandwidth >4 GHz was achieved. - Designed in CST Microwave Studio, and Layout in Keysight ADS. - Measurements and Characterization of the antenna. - FMCW Radar field testing.

Specialization: Communications Circuits and Systems