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Model of broadband reflective polarizer proposed in this report. The polarizer may consist of one or of several flat layers of anisotropic metamaterial. Anisotropic layer is an ENG medium for one of the two linear orthogonal polarizations, and MNG medium for the second polarization. The operating frequency band of the polarizer is approximately determined by the ratio between the plasma and resonance...
A highly linear power amplifier (PA) with ultra-wide video bandwidth is designed at a Ka-band for 5G application. To get a high linearity with high efficiency, a deep class-AB topology with 2nd harmonic control circuits is employed, reducing the 3rd order nonlinearity. Further, an efficient low-drop out (LDO) regulator is proposed to suppress the memory effect generated by the envelope and fundamental...
Single-phase inverters are connected to the grid at the distribution system level. Because the grid impedance can be large at this level, it is important to consider the effect of the grid impedance on the control performance of the inverter. A PI controller is often adopted for current control in a single-phase inverter. With an increase in the grid impedance, the open loop cut-off frequency decreases,...
We report an approach to controlling friction forces on sliding human fingertips in order to produce simultaneous vibrations across an exceedingly broad range of tactile, audible, and ultrasonic frequencies. Vibrations in the skin can be felt directly by the fingertip, and vibrations in the air can be heard emanating from the proximity of the finger. We introduce and detail an experimental apparatus...
A 32Gb/s-NRZ, 15GBaud/s-PAM4 configurable DFB Laser Diode Driver (LDD) is presented in standard 65nm CMOS. The driver employs a balanced-input, single-ended-output topology to deliver large current output, and integrates a tunable pre-emphasis to extend the bandwidth. An on-chip active back-termination (ABT) is proposed which absorbs loading reflections without sacrificing the effective modulation...
This paper presents a wideband high efficiency continuous class-F (CCF) power amplifier (PA) at mm-Wave frequencies for the first time. A tuned load with a high-order harmonic resonance network is used to shape the current and voltage waveforms for the proposed CCF CMOS PA. Further, a transformer with a tunable coupling-coefficient (ktune) is incorporated in the tuned load network to address the detrimental...
This paper presents a 32 GHz transformer-based Doherty power amplifier (PA) in a 28 nm bulk CMOS process. There are two techniques proposed: linearization by means of AM-PM and AM-AM compensation of the class AB and the class C amplifiers; and parallel-series-parallel power power combiner, wherein a current-mode parallel combiner complements the Doherty's voltage-mode series combiner to boost the...
A 14nm FinFET CMOS 12-b current-steering digital-to-analog (DAC) for 2G/3G/4G cellular applications is presented. A bit segmentation of 6-bit thermometer and 6-bit binary is adopted, and it utilizes the dynamic element matching (DEM) technique to suppress the spurious tones caused by the current source mismatches in 3-D FinFETs. In addition, to keep the voltage drop across each transistor within long-term...
This paper presents a 29-to-57GHz (65% BW) AM-PM compensated class-AB power amplifier tailored for 5G phased arrays. Designed in 0.9V 28nm CMOS without RF thick top metal, the PA achieves a Psat=15.1dBm±1.6dB and |AM-PM|<1° from 29-to-57GHz, with a peak PAE of 24.2%. Techniques are studied to realize the required load impedance and distortion cancellation over the wide band of operation, while...
This paper presents the design of a 1024-channel dual-modality CMOS biosensor suitable for both capacitive sensing and impedance spectroscopy. The chip serves as a platform for detection, localization and monitoring of bacteria and can be adopted for affinity-based assays. The chip features a 32×32 array of unpassivated metal electrodes formed on the top metal of a 0.18μm CMOS process, with an overall...
This paper presents a wideband blocker-tolerant Direct ΔΣ receiver (DDSR). Blockers are attenuated through selective input impedance matching and optimized gain design. The created impedance profile provides low receiver input impedance at blocker frequencies, while at desired frequencies, the impedance is boosted to matched condition through an up-converted positive feedback from the DDSR output...
This paper introduces an analog bandwidth mismatch compensation technique for Time-Interleaved Analog-to-Digital Converters (TI-ADCs). It takes advantage of a Fully Depleted Silicon On Insulator (FD-SOI) technology to compensate for the bandwidth mismatch errors among channels. Our technique utilizes the body-effect to adjust the on-resistance of the sampling switch, by means of a 6-bit Digital-to-Analog-Converter...
SMA connector is widely used in the high-speed interconnection system. As more designs move toward high-speed serial links with picosecond edge rate, the signal integrity problems caused by the transition structure from SMA connector to the PCB cannot be neglected, especially for precise AFR calibration. To solve this problem, we present four optimization methods, including optimizing the size of...
A 19.2 Gb/s per lane link with IBM's latest POWER8 processor module has been analyzed. This paper presents the overview of the high-speed link design from the signal integrity point of view. Design approaches in package and printed circuit board (PCB) to support the target data-rate have been discussed. The end-to-end communication bus is modeled from extracted post-route design with a 3-D full-wave...
In this paper, two investigations of transparent patch antennas are demonstrated. One is using the liquor serving as the antennas while another is the study of the temperature influence of the distilled water on the antenna's radiation performances. The measured results show that the liquor has wide impedance bandwidth of more than 30% for |S11| < − 10 dB and the temperature variation of the water...
In this paper, the resistor effect on isolation bandwidth of a compact Wilkinson power divider is studied. The discussion is based on an equal modified compact power divider on RO4003, with center frequency of 2.4 GHz. In this compact power divider, stepped impedance interdigital coupling sections were introduced to replace the quarter wavelength impedance transformer of Wilkinson power divider to...
This paper presents a low profile unidirectional UWB cavity backed antenna analyzed using The Theory of Characteristics Modes (TCM). The main goal of this work is to design a low profile UWB antenna with a very stable and unidirectional radiation pattern. The proposed design is based on exciting the fundamental mode of a cavity structure composed of a metallic ring, a circular waveguide and two circular...
This paper presents a Ruthroff type spiral un-to-un transmission-line transformer (TLT) with impedance transformation ratio of 4∶9. Our TLT is fabricated in Microstrip lines technology and covers a chip area of 1.02 mm × 1.12 mm. The simulated minimum insertion loss is 0.19 dB at 5.4 GHz, and the correspondent bandwidth of this TLT is 5.4 GHz (when the insertion loss exceeds 1 dB).
The goal of this paper is to compare two configurations of Ruthroff un-to-un 1∶4 TLT using coupled microstrip lines. Concentric and interwound Transmission line transformers were simulated by HFSS simulator. The simulated minimum insertion losses of the concentric and interwound TLTs are 0.27 dB at 5.4 GHz and 0.26 dB at 4.5 GHz, respectively. The correspondent bandwidths of these TLTs are 7.22 GHz...
In this paper a stacked modified Sierpinski's gasket fractal antenna is presented to achieve dual band behavior and wide bandwidth for satellite down link and uplink application in C-band D/L 4Ghz (3.82Ghz-4.38Ghz) and U/L 6Ghz (5.92Ghz-6.19Ghz) bands respectively. It is designed with proximity feeding technique using FR4 (∊r=4.4) substrate and height of the substrate h=1.6mm. Based on self similar...
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