A5048704123- Photonic and Optical Devices
- Advanced Photonic Communication Systems
- Radio Frequency Integrated Circuit Design
- Optical Network Technologies
- Microwave Engineering and Waveguides
- Millimeter-Wave Propagation and Modeling
- Advanced Fiber Laser Technologies
- Advanced MIMO Systems Optimization
- Semiconductor Lasers and Optical Devices
- Advanced Power Amplifier Design
- Antenna Design and Optimization
- Antenna Design and Analysis
- Power Systems and Renewable Energy
- Multilevel Inverters and Converters
- Advancements in PLL and VCO Technologies
- Photovoltaic System Optimization Techniques
University of Tabriz
2025
University of California, Santa Barbara
2017-2022
New York University
2021
Universitat Politècnica de Catalunya
2018
Northrop Grumman (United States)
2018
Leibniz Institute for High Performance Microelectronics
2018
Fudan University
2018
Villanova University
2018
Sharif University of Technology
2016
As datacenters continue to scale in size, energy efficiency for short reach (<; 2 km) links is a major factor networks that may connect hundreds of thousands servers. We demonstrate based on analog coherent detection (ACD) offer promising path simultaneously achieving significantly larger link budgets and improved efficiency. A complete analysis presented considers the power consumption all photonic electronic components necessary realize an ACD architecture 50 Gbaud (GBd) quadrature...
High peak and average efficiency is an important feature of power amplifiers (PAs) for 5G millimeter-wave communication. This article reviews the challenges conventional outphasing approaches in CMOS technologies demonstrates a low-loss combiner low loadline impedance. Undesirable characteristics devices are compensated with neutralization, unilaterization, stabilization networks PA (OPA). The OPA realized 45-nm silicon on insulator (SOI) 40% 6-dB backoff drain (DE) while providing 17-dBm...
Wireless communication above 100 GHz offers the potential for massive data rates and has attracted considerable attention Beyond 5G 6G systems. A key challenge in receiver design these bands is power consumption, particularly mobile portable devices. This paper provides a general methodology understanding trade-offs of consumption end-to-end performance large class receivers frequencies. The framework applied to fully digital 140 with 2 sample rate, targeted likely cellular applications....
This letter presents a Ka-Band 0.1-μm GaAs pHEMT Power Amplifier with broad bandwidth. The isolating backvia wall (IBVW) has been proposed to improve the stability and performance. Over frequency band of 31-40 GHz, implemented PA delivers 5 W saturated output power, 28% maximum power added efficiency (PAE) 20 dB small-signal gain. chip size is 11.9 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . To best authors knowledge, presented...
Silicon photonics offer a low-cost platform for largescale RF system integration. Spur-free dynamic range (SFDR) analog and photonic components is limited by electrical optical characteristics of the pand njunction used to produce plasma dispersion. We propose silicon ring modulator demonstrate design conditions that balance phase change between DC Kerr dispersion effects broadband, linear electro-optical conversion. A shifter tested within an SFDR 98 dB·Hz <sup...
100–300 GHz wireless systems can provide very high data rates per signal beam, and, given the short wavelengths, even compact arrays contain many elements, and hence simultaneously transmit, in same frequency band, simultaneous independent beams to further greatly increase capacity. We will describe representative system designs, including hubs backhaul links using massive spatial multiplexing, plus imaging radar systems, evaluate their feasible performance, identify key challenges...
The dynamic range of a radio-over-fiber (RoF) link is fundamentally limited by the linearity electro-optic modulators. Silicon photonic (SiP) processes offer significant potential for integration, but plasma dispersion effect impacts realizable spur-free (SFDR). This article analyzes underlying source nonlinearity in SiP Mach-Zehnder modulator (MZM) and demonstrates fundamental limitations on intermodulation distortion. A SiGe low-noise distributed driver co-designed MZM to linearize extend...
RF photonic components suffer from poor spurious-free dynamic range (SFDR) due to the high noise and distortion generated by a silicon (SiP) Mach-Zehnder modulator (MZM). This work demonstrates distributed silicon-germanium (SiGe) heterojunction bipolar transistor (HBT)-based low-noise amplifier (LNA) co-designed for linearization with SiP MZM broadband radio-over-fiber (RoF) link. The SiGe LNA incorporates distributed, tunable predistortion scheme that is inherently wideband improves...
100–300GHz wireless systems can provide very high data rates per signal beam, and, given the short wavelengths, even compact arrays contain many elements, and hence simultaneously transmit, in same frequency band, simultaneous independent beams to further greatly increase capacity. We will describe representative system designs, including hubs backhaul links using massive spatial multiplexing, plus imaging radar systems, evaluate their feasible performance, identify key challenges...
A wideband 57.7-84.2 GHz Phase Shifter is presented using a compact Lange coupler to generate in-phase and quadrature signal. The followed by two balun transformers that provide the IQ vector modulation with differential I Q signals. implemented demonstrates an average 6-dB insertion loss 5-dB gain variation. measured rms phase errors are 7 degrees 1 dB, respectively. shifter in GlobalFoundries 45-nm SOI CMOS technology trap-rich substrate. chip area 385 μm × 285 consumes less than 17 mW. To...
Radio-over-fiber (RoF) supports microwave and millimeter-wave communication with remote antenna heads. However, RoF links suffer from low spur-free dynamic range (SFDR) due to the gain high nonlinearity of silicon photonic (SiP) Mach-Zehnder modulators (MZM). This work demonstrates first distributed silicon-germanium (SiGe) HBT LNA co-designed for linearization a broadband SiP-based link. The SiGe features intermodulation (IM) injection scheme that is inherently wideband, improving IIP3 over...
─We report an energy-efficient vertical cavity surface-emitting laser (VCSEL) driver implemented in a 130 nm SiGe HBT technology. Operation at data rates as high 60 Gbps is demonstrated with the use of two-tap feed-forward equalizer (FFE) using differentiator circuit output stage that eliminates need for inductors and results compact area (0.032 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ). The current contribution produces...
This paper presents an integrated optical driver and Mach-Zehnder modulator (MZM) that operates to 50 Gb/ <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$s$</tex> . The MZM consists of 4 traveling wave segments along a 3.2 mm length in 90-nm Silicon Photonic (SiP) technology. broadband distributed amplifier is pseudo-differential design with 3-stack stages deliver sufficient voltage swing 45nm CMOS SOI eye open indicates error-free operation 30...
We review the potential of RF photonics for microwave and millimeter-wave communication systems. The integration photonic components in silicon CMOS processes introduces new realizing beamforming systems with substantial signal processing relatively low-power remote antennas. This paper reviews link operation reveals fundamental device challenges to wide-band high dynamic range links. demonstrate spur-free more than 110 dBc Hz <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
We present a model of intermodulation distortion (IMD) in RF silicon photonic modulators to highlight mechanisms that limit the device linearity. compare SFDR two MZMs show common IMD limitation and indicate methods improve linearity modulators.
This paper investigates co-design of a broadband RF low-noise driver for silicon photonic (SiP) Mach-Zehnder modulators (MZM). The frequency response SiP demonstrates significant spur-free dynamic range (SFDR) reduction in microwave bands due to the linearity and noise figure modulator. A distributed circuit is proposed 0.13μm SiGe process consists LNA, an active balun, high-voltage swing driver. MZM fabricated 65-nm Silicon Photonic process. RoF transmitter achieves 1-20 GHz bandwidth SFDR...
This paper presents a 56 Gb/s traveling-wave Mach-Zehnder Modulator (TW-MZM) driver fabricated in the GlobalFoundries 8XP 130-nm SiGe BiCMOS process employing cascode topology. The quasi-open collector design delivers 4.4 <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">${{\mathrm{V}}_{\text{pp}}}$</tex> differential swing and reduces amplitude of secondary reflections while maintaining low overall power consumption 460 mW, or 8.2 pJ/bit at Gb/s,...
Power consumption is a key challenge in millimeter wave (mmWave) receiver front-ends, due to the need support high dimensional antenna arrays at wide bandwidths. Recently, there has been considerable work developing low-power often based on low-resolution ADCs and mixers. A critical but less studied consequence of such designs relatively low-dynamic range which turn exposes adjacent carrier interference blockers. This paper provides general mathematical framework for analyzing performance...
A hybrid approach incorporates traveling-wave amplifier stages into the Mach- Zehnder modulator (MZM) to reduce area and power improve bandwidth in a 90-nm silicon photonic (SiPh) CMOS process. Optical measurements demonstrate data rates up 30 Gb/s.
Topical Workshop on The Internet of Space (TWIoS)The IEEE (IoS) Conference addresses the wild west space applications, often called New Space, Entrepreneurial or Commercial Space.It is emeremphasis microwave hardware.There has been a renaissance interest and investment in space-and suborbital-based high-data-rate communications networks other applications.This conference focuses hardware technology that will make possible.
Power consumption is a key challenge in millimeter wave (mmWave) receiver front-ends, due to the need support high dimensional antenna arrays at wide bandwidths. Recently, there has been considerable work developing low-power often based on low-resolution ADCs and mixers. A critical but less studied consequence of such designs relatively low-dynamic range which turn exposes adjacent carrier interference blockers. This paper provides general mathematical framework for analyzing performance...
This paper presents a differential optical receiver integrated circuit (RXIC) with variable-transimpedance amplifier (VTIA), two-stage variable-gain amplifier, and <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathbf{50}-\Omega$</tex> output buffer based on 90-nm SiGe BiCMOS technology. The VTIA incorporates tunable load feedback resistors to adjust the gain frequency response introduces higher dynamic range in RXIC. Electrical measurements...
Low-power solutions are crucial for realizing the throughput gains of mmWave massive MIMO in base station to mobile links, particularly battery-powered handset. LNA power consumption is a significant bottleneck scaling large arrays at high frequencies. We propose simplified phased array architecture 140 GHz receiver that uses activation switches place noisy phase shifters, allowing relaxation gain requirements and, consequently, consumption. On-off beamforming employed, which introduces...