A5022980323- Radio Frequency Integrated Circuit Design
- Advanced Power Amplifier Design
- Microwave Engineering and Waveguides
- Advanced MIMO Systems Optimization
- Semiconductor Quantum Structures and Devices
- Groundwater and Isotope Geochemistry
- Advanced Photonic Communication Systems
- Millimeter-Wave Propagation and Modeling
- Water Quality and Pollution Assessment
- Telecommunications and Broadcasting Technologies
- Groundwater flow and contamination studies
- Energy Harvesting in Wireless Networks
Rice University
2023-2024
Shenyang Jianzhu University
2024
This article presents a millimeter-wave (mmWave) three-way Doherty output network and its silicon implementation at 38 GHz for 5G new radio (NR) orthogonal frequency-division multiplexing (OFDM). The proposed synthesis methodology can realize impedance levels that are close to the ideal operation, reduce transformation ratio back-off, directly absorb device's parasitic capacitance. Its design procedure tradeoffs discussed in detail. A 38-GHz power amplifier (PA) prototype is implemented...
As mm-wave 5G continues to advance in the 28 and 38GHz bands (n257 n261), ever-increasing demand for data-rates is also driving expansion higher frequencies, such as 47GHz band (n262) V (n263). In these bands, achieving high energy efficiency remains a critical design challenge, especially wideband NR OFDM signals with 10-to-12dB PAPR up 2000MHz channel bandwidth (as introduced 3GPP V17.6.0). Multiway Doherty PAs [1–3] LMBAs [4] have been explored enhance at deep power back-off (PBO). Beyond...
This article presents a new notch steering scheme for hybrid beamforming transmitters (TXs) aimed at suppressing spatial interference, thereby enhancing the signal-to-interference-plus-noise ratio (SINR) to support multiplexing. Built upon existing phased arrays, this integrates an auxiliary-path vector modulator (VM) into each antenna element, which in turn, forms interference-canceling beam. By spatially combining array factors (AFs) of main beam and beam, deep is created while ensuring...
This article presents a millimeter-wave (mmWave) power-combined Doherty power amplifier (PA) topology. To reach watt-level output and simultaneously enhance back-off efficiency, we propose multifunctional PA network based on an extended rat-race coupler, which enables the following: 1) parallel load modulation; 2) multiway series combining; 3) differential to single-ended conversion. As proof of concept, 38-GHz prototype is implemented in GlobalFoundries 45-nm CMOS SOI process. It...
Phased arrays serve as the foundational technology for mmWave communications to combat path loss and improve energy efficiency. Although phased are ubiquitous at mmWave, it is still desirable realize high output power per antenna user equipment (UE) small cells due their array size constraints. Recent advances in silicon amplifier (PA) research have led significant performance improvement low-and medium-power PAs $(\lt 23 \mathrm{dBm})$. However, design of high-power yet high-efficiency...