Jian Pang 교수

This paper presents a 28-GHz CMOS four-element phased-array transceiver chip for the fifth-generation mobile network (5G) new radio (NR). The proposed transceiver is based on the local-oscillator (LO) phase-shifting architecture, and it achieves quasi-continuous phase tuning with less than 0.2-dB radio frequency (RF) gain variation and 0.3° phase error. Accurate beam control with suppressed sidelobe level during beam steering could be supported by this work. At 28 GHz, a single-element transmitt

This article presents a low-cost and area-efficient 28-GHz CMOS phased-array beamformer chip for 5G millimeter-wave dual-polarized multiple-in-multiple-out (MIMO) (DP-MIMO) systems. A neutralized bi-directional technique is introduced in this work to reduce the chip area significantly. With the proposed technique, completely the same circuit chain is shared between the transmitter and receiver. To further minimize the area, an active bi-directional vector-summing phase shifter is also introduced

It has been found that for a focused laser beam propagating in free space, there exists, surrounding the laser beam axis, a subluminous wave phase velocity region. Relativistic electrons injected into this region can be trapped in the acceleration phase and remain in phase with the laser field for sufficiently long times, thereby receiving considerable energy from the field. Optics placed near the laser focus are not necessary, thus allowing high intensities and large energy gains. Important fea

This article introduces a power-efficient and low-cost CMOS 28-GHz phased-array beamformer supporting fifth-generation (5G) dual-polarized multiple-in-multiple-out (MIMO) (DP-MIMO) operation. To improve the cross-polarization (cross-pol.) isolation degraded by the antennas and propagation, a power-efficient analog-assisted cross-pol. leakage cancellation technique is implemented. After the high-accuracy cancellation, more than 41.3-dB cross-pol. isolation is maintained along with the transmitter

This paper presents a 60-GHz CMOS transceiver targeting the IEEE 802.11ay standard. A calibration block for local oscillator feedthrough (LOFT) and I/Q imbalance featuring high accuracy and low power consumption is integrated with the transceiver. With the help of the proposed calibration, this paper is capable of boosting the data rate with higher order modulation scheme and wider channel-bonding bandwidth, which are demanded by IEEE 802.11ay. At the same time, it maintains the compatibility wi

5G NR service will provide extremely-high-speed mobile data access using the millimeter-wave spectrum. To further boost the data-rate and spectrum efficiency, dual-polarized MIMO (DP-MIMO) will be introduced [1-4]. Separated beamformer arrays will be required for H and V polarizations. However, the increased free-spacepath-loss for the 5G NR band n257 (26.5GHz to 29.5GHz) demands numerous elements to cover enough communication distance. Concerning the required considerable number of chips, an ar

The 60GHz carrier with 9GHz bandwidth enables ultra-high-speed wireless communication in recent years [1–4]. To meet the demand from rapidly-increasing data traffic, the IEEE802.11ay standard is one of the most promising candidates aiming for 100Gb/s data-rate. Both higher-order digital modulation such as 128QAM and channel bonding at 60GHz are considered to be used in the IEEE802.11ay standard. However, the more severe requirements of LO feedthrough (LOFT) and image-rejection ratio (IMRR) have

This article presents a 60-GHz CMOS transceiver designed for IEEE 802.11ay. To reduce the manufacturing cost, an area-efficient bidirectional technique is utilized in this work. The proposed bidirectional amplifier allows the sharing of interstage passive components. A five-stage power-amplifier (PA)-low-noise-amplifier (PA-LNA) designed based on the proposed bidirectional amplifier occupies less than half on-chip area, while staying a similar performance with the conventional standalone PA-LNA.

This paper presents a CMOS implementation of 28-GHz 4-element phased-array transceiver for 5G new radio. The proposed LO phase shifting architecture realizes very fine 0.04° phase tuning step and gain-invariant feature. An 8-element transceiver demonstrates the measured 0.1-degree beam-steering resolution and less than 0.2dB gain variation over the whole phase tuning range. In as-meter distance, the transceiver achieves 6.4Gb/s in 256QAM for beam angle of ±50° together with a maximum data rate o

In this paper, a 28GHz CMOS vector summing phase shifter designed for the 5G mobile network is introduced. With the proposed gain-error compensation technique, the measured gain variation due to phase tuning within 27.4 ~28.6GHz is less than 0.47dB together with an RMS gain error of 0.13dB. The measured RMS phase error is less than 0.54°. Gain-invariant, high-accuracy phase control is realized by this work. In the measurement, the proposed phase shifter supports a maximum data rate of 11.2Gb/s i

The coverage of 5G NR frequency range 2 (FR2) keeps scaling towards over 100GHz. Multi-band receivers have been developed to realize reception over multiple 5G FR2 bands with minimized system size [1]–[3]. The conventional multi-band receiver achieves 20-to-44GHz frequency coverage with wide-band RF response and fixed IF [3]. However, facing the fast-scaling 5G FR2 band, the power consumption of such receivers will be increased tremendously due to the enlarged LO frequency coverage. The Hartley