A5031164857- Microwave Engineering and Waveguides
- Radio Frequency Integrated Circuit Design
- Millimeter-Wave Propagation and Modeling
- Advanced Photonic Communication Systems
- Wireless Power Transfer Systems
- Advanced Power Amplifier Design
- Electromagnetic Compatibility and Noise Suppression
- Full-Duplex Wireless Communications
- Energy Harvesting in Wireless Networks
- Advanced Antenna and Metasurface Technologies
- 3D IC and TSV technologies
- Advancements in PLL and VCO Technologies
- Radar Systems and Signal Processing
- Advanced Adaptive Filtering Techniques
- Acoustic Wave Resonator Technologies
Washington State University
2019-2024
University of Tehran
2015
This paper presents a new continually-stepped variable gain low-noise-amplifier (CSVG-LNA) for millimeter-wave (mm-wave) 5G communications. The proposed variable-gain functionality in two-stage LNA is achieved by incorporating tunable-transformer at the 2nd-stage. tunability coupling-coefficient of transformer allows to change output matching continuous fashion thus enabling design CSVG-LNA. CSVG-LNA alleviates high power consumption and large noise-figure (NF) variation problems traditional...
The decadal research in integrated true-time-delay arrays have seen organic growth enabling realization of wideband beamformers for large with wide aperture widths. This article introduces highly reconfigurable delay elements implementable at analog or digital baseband that enables multiple Spatial Signal Processing (SSP) functions including beamforming, interference cancellation, and fast beam training. Details the beam-training algorithm, system design considerations, architecture circuits...
This article presents a highly efficient GaN-based harmonic-tuned multiband RF rectifier for wireless power transfer (WPT) applications. The has been implemented by incorporating microstrip coupler and transmission line-based phase shifter to convert amplifier (PA) into synchronous based on the time-reversal duality principle. proposed provides compact solution charging systems while supporting dual-bands. is used derive gate driving signal device, which requires weak coupling from input...
This paper presents a triple-band voltage controlled-oscillator (VCO) with new dual-path inductor. The change in inductance value of the proposed inductor is large while maintaining high Q, enabling to achieve low phase noise oscillation octave frequency range. inductances two modes operation can be set independently, depending on target frequencies. used as coarse tuning, fine tuning realized by 2-bit capacitor bank small size varactor. As proof concept, VCO class-D biasing has been...
This article presents a dual-band power amplifier for 28 and 39 GHz frequency bands based on new dual-path transformer (DPT). DPT can provide two optimum inductive values at different to optimally design the matching networks each band without using any switch circuitries. It operates as output input in parallel combiner divider, respectively. DPT-based PA breaks trade-off between bandwidth performance conventional wideband PAs by separating one whole into narrow providing matchings band....
This paper presents a dual-band RF rectifying circuit for wireless power transmission at 1.17 GHz and 2.4 GHz. A harmonic-tuned inverse-class F/class-F mode amplifier using 10 W GaN device has been utilized to implement the proposed rectifier with an on-board coupler phase shifter. The matching is precisely designed so that operates in inverse class F lower upper frequency bands harmonic tuning, respectively. Measurement results show 78% 76% efficiencies bands, To best of authors' knowledge,...
The decadal research in integrated true-time-delay arrays have seen organic growth enabling realization of wideband beamformers for large with wide aperture widths. This article introduces highly reconfigurable delay elements implementable at analog or digital baseband that enables multiple SSP functions including beamforming, interference cancellation, and fast beam training. Details the beam-training algorithm, system design considerations, architecture circuits range-to-resolution ratios...
This paper presents a dual-equalization-path (DEP) near field inductive coupling link for contactless vertical interconnect in high-performance 3D IC. The DEP receiver is demonstrated the first time links to improve energy per bit and area efficiency. A feedback mechanism main path helps signal recovery improving voltage margin. While linear auxiliary using passive pulse-reuse feedforward equalization timing We also demonstrate how architecture enabling an energy-efficient compact...
This paper presents a low phase noise 28 GHz voltage-controlled oscillator (VCO) using transformer-based active impedance converter to enhance the quality factor (Q) of capacitor in resonator. The can Q bank and varactor by 25-40% across VCO's tuning range. proposed VCO is fabricated Q-enhancement standard 65 nm CMOS process. achieves 15.9% measured fractional frequency range −107.6 dBc/Hz at 1 MHz offset from oscillation while occupying only 0.05 mm2 area (200 μm ß 250 μm). consumes 5.1 mW...
We present a low phase noise four-core triple-band voltage controlled-oscillator (VCO) with reconfigurable oscillator cores and multi-mode resonator. By activation/deactivation of change resonator impedance in three modes operations, the proposed VCO provides complete freedom selecting resonance frequency for operation bands mm-wave range. The is implemented 65 nm CMOS process using compact high-Q triple-mode oscillation frequencies center at 19,28, 38 GHz while providing good power...
In this paper design flow of an optimum FMCW system for medium to long range detection has been reviewed. Inadition, a closed-loop synthesizers introduced which uses precise filters shape up low frequency beat signal. Using the mentioned technique enhances track total system. The designed and implemented using discrete elements. measurement results show IF gain 90dB, −105dBm sensitivity tracking 30m.