60-GHz Self-Heterodyne Through-Repeater Systems with Suppressed Third-Order Intermodulation Distortions

2010 ◽  
Vol E93-C (1) ◽  
pp. 94-100 ◽  
Author(s):  
Chang-Soon CHOI ◽  
Yozo SHOJI ◽  
Hiroki OHTA
Keyword(s):  
60 Ghz ◽  
Third Order ◽  
Intermodulation Distortions

Mitigating the Effects of Non-Linear Distortion Using Polarizers in Microwave Photonic Link

2019 ◽  
Vol 0 (0) ◽  
Author(s):  
Sarika Singh ◽  
Sandeep K. Arya ◽  
Shelly Singla
Keyword(s):  
Dynamic Range ◽  
Extinction Ratio ◽  
Polarization Angle ◽  
Third Order ◽  
Microwave Photonic ◽  
Linear Behavior ◽  
Spurious Free Dynamic Range ◽  
Non Linear ◽  
Intermodulation Distortions ◽  
Insertion Losses

AbstractA scheme to suppress nonlinear intermodulation distortion in microwave photonic (MWP) link is proposed by using polarizers to compensate inherent non-linear behavior of dual-electrode Mach-Zehnder modulator (DE-MZM). Insertion losses and extinction ratio have also been considered. Simulation results depict that spurious free dynamic range (SFDR) of proposed link reaches to 130.743 dB.Hz2/3. A suppression of 41 dB in third order intermodulation distortions and an improvement of 15.3 dB is reported when compared with the conventional link. In addition, an electrical spectrum at different polarization angles is extracted and 79^\circ is found to be optimum value of polarization angle.

Reduction of Third-Order Intermodulation Distortions for Optical Single Sideband Modulated Signals

2006 ◽  
Author(s):  
Christina Lim ◽  
Ampalavanapillai Nirmalathas ◽  
Kalun Lee ◽  
Dalma Novak ◽  
Rod Waterhouse
Keyword(s):  
Third Order ◽  
Single Sideband ◽  
Optical Single Sideband ◽  
Modulated Signals ◽  
Intermodulation Distortions

A dual parallel Mach–Zehnder modulator linearization scheme based on 90° phase shifters

Frequenz ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Sarika Singh ◽  
Sandeep K. Arya ◽  
Shelly Singla ◽  
Pulkit Berwal
Keyword(s):  
Dynamic Range ◽  
Phase Shifters ◽  
Complete Suppression ◽  
Third Order ◽  
Two Phase ◽  
Spurious Free Dynamic Range ◽  
Non Linear ◽  
Transmission Link ◽  
Mach Zehnder Modulator ◽  
Intermodulation Distortions

Abstract In this paper, a dual-drive dual-parallel Mach–Zehnder Modulator based linearization scheme is implemented by utilizing only two phase shifters and comprehensively demonstrated for a photonic transmission link. Third order intermodulation distortion is suppressed by adjusting angles of electrical phase shifters i.e. π/2 and−π/2 and a non-linear distortion immune system can be proposed for microwave photonic link. A complete suppression in intermodulation terms and 20.8 dB enhancements are found in spurious free dynamic range (SFDR). SFDR reaches 135.6 dB Hz4/5 by suppressing major spurious contributors of third order intermodulation distortions in optical domain only which ensures the improvement in performance of link against non-linear terms.

scholarly journals Overlapped Gate-Source/Drain H-shaped TFET: Proposal, Design and Linearity Analysis

2021 ◽  
Author(s):  
Utkarsh Upadhyay ◽  
Ashish Raman ◽  
RAVI RANJAN ◽  
Naveen Kumar
Keyword(s):  
Potential Energy ◽  
Electric Potential ◽  
Tunneling Current ◽  
Energy Band Diagram ◽  
Band Diagram ◽  
Third Order ◽  
Band To Band Tunneling ◽  
Non Local ◽  
Intermodulation Distortions ◽  
Intercept Point

Abstract In this paper, the proposed design of H-shaped TFET has been discussed. This design is providing a high Ion/Ioff ratio with better Ion. HfO2 is used for better tunneling current. With this device, Different parameters such as unit parameter, analogue parameter, and linearity parameter have been studied and investigated the output of the H-TFET. As unit parameters, the electric field, electric potential, energy band diagram, and non-local band-to-band tunneling rate (BTBT) have all been observed. Second and third-order harmonics distortion (HD2, HD3), third-order current intercept point (IIP3), third-order intermodulation distortions (IMD3), and second and third-order voltage intercept point (VIP2, VIP3) are evaluated as linearity parameters that characterize the device's distortions and linearity. We obtained Ion\({\text{=1.6×}10}^{-4}\) A/µm, Ioff=2.1\({\text{×}10}^{-19}\) A/µm, Ion /Ioff=7.6\({\text{×}10}^{14}\),threshold voltage Vt=0.3449 V. © 2017 Elsevier Inc. All rights reserved.

Wideband high-efficiency linearized PA design with reduction in memory effects and IMD3

2018 ◽  
Vol 10 (4) ◽  
pp. 391-400 ◽  
Author(s):  
Xuekun Du ◽  
Chang Jiang You ◽  
Yulong Zhao ◽  
Xiang Li ◽  
Mohamed Helaoui ◽  
...  
Keyword(s):  
Output Power ◽  
Average Output Power ◽  
High Efficiency ◽  
Second Harmonic ◽  
Memory Effects ◽  
Third Order ◽  
Average Output ◽  
Power Added Efficiency ◽  
Low Pass ◽  
Intermodulation Distortions

ABSTRACTAn analytical method is proposed to reduce the memory effects and third-order intermodulation distortions for improving the linearity of wideband power amplifier (PA). An excellent linearity can be obtained by reducing the second-harmonic output power levels and reducing the envelope voltage components in the megahertz range. An improved wideband Chebyshev low-pass matching network including the bias network is analyzed and designed to validate the proposed method. The measured results indicate that a wideband high-efficiency linearized PA is realized from 1.35 to 2.45 GHz (fractional bandwidth = 58%) with power added efficiency of 60–78%, power gain of 10.8–12.3 dB, and output power of 40.0–41.2 dBm. For a 20 MHz LTE modulated signal, the adjacent channel leakage ratios (ACLRs) of the proposed PA with digital pre-distortion (DPD) linearization are −55.7 ~ −53.9 dBc across 1.5–2.4 GHz at an average output power of 32.4–33.6 dBm. For a 40 MHz two-carrier LTE modulated signal, the ACLRs of the proposed PA with DPD linearization are −51.1 ~ −48.2 dBc at an average output power of ~30.5 dBm in the frequency range from 1.5 GHz to 2.4 GHz.

scholarly journals Investigation on Third-Order Intermodulation Distortions Due to Material Nonlinearities in TC-SAW Devices

2018 ◽  
Vol 65 (10) ◽  
pp. 1914-1924
Author(s):  
Vikrant Chauhan ◽  
Markus Mayer ◽  
Elena Mayer ◽  
Werner Ruile ◽  
Thomas Ebner ◽  
...  
Keyword(s):  
Third Order ◽  
Saw Devices ◽  
Intermodulation Distortions

scholarly journals Investigation of Ways of Dynamic Range Expansion for Broadband Receiver Microwave Devices in Multi-Signal Mode

2018 ◽  
pp. 85-90
Author(s):  
S. A. Bogdanov ◽  
P. V. Kupriyanov ◽  
S. V. Nikolaev ◽  
S. A. Petrov
Keyword(s):  
Output Power ◽  
Dynamic Range ◽  
Experimental Studies ◽  
Technical Solution ◽  
Third Order ◽  
Measurement Results ◽  
Signal Mode ◽  
Output Amplifier ◽  
Intermodulation Distortions ◽  
Upper Boundary

 The article investigates ways to expand the dynamic range of broadband microwave receiving devices. The task is to lim-it the output signals while increasing the upper boundary of the dynamic range by the criterion of the thirdorder inter-modulation component suppression. The main relations  determining the dynamic range boundary conditions are pre-sented. Experimental studies of three variants of constructing the broadband microwave receiver output path in two-ton mode of operation are carried out for:– an output amplifier with a point of 1 dB of output power compression at the level corresponding to safe output power;– a powerful output amplifier with a passive diode limiter on the output;– a powerful output amplifier with an automatic attenuation adjustment circuit connected to its input.The measurement results of the magnitude of intermodulation distortions suppression and output power are presented as a function of the input signal level for various nonlinear elements. Based on the analysis of the measured characteristics, an optimal technical solution is found for constructing an output path. The dynamic range is extended by more than 20 dB. Suppression of intermodulation components of the third order exceeds 60 dB. Effective functioning of the broadband receiver in multisign mode is ensured.

Probe size and 5th-order aberration

1987 ◽  
Vol 45 ◽  
pp. 134-135 ◽  
Author(s):  
Zhifeng Shao
Keyword(s):  
Electron Probe ◽  
Spherical Aberration ◽  
Wave Length ◽  
Cylindrical Symmetry ◽  
Electron Wave ◽  
Third Order ◽  
The Third ◽  
Probe Radius ◽  
Small Probe ◽  
Probe Size

A small electron probe has many applications in many fields and in the case of the STEM, the probe size essentially determines the ultimate resolution. However, there are many difficulties in obtaining a very small probe.Spherical aberration is one of them and all existing probe forming systems have non-zero spherical aberration. The ultimate probe radius is given byδ = 0.43Csl/4ƛ3/4where ƛ is the electron wave length and it is apparent that δ decreases only slowly with decreasing Cs. Scherzer pointed out that the third order aberration coefficient always has the same sign regardless of the field distribution, provided only that the fields have cylindrical symmetry, are independent of time and no space charge is present. To overcome this problem, he proposed a corrector consisting of octupoles and quadrupoles.

Children’s Recall of Approximations to English

1973 ◽  
Vol 16 (2) ◽  
pp. 201-212 ◽  
Author(s):  
Elizabeth Carrow ◽  
Michael Mauldin
Keyword(s):  
Language Development ◽  
Fourth Order ◽  
Third Order ◽  
Memory Processes ◽  
The Third ◽  
General Index ◽  
General Linguistic

As a general index of language development, the recall of first through fourth order approximations to English was examined in four, five, six, and seven year olds and adults. Data suggested that recall improved with age, and increases in approximation to English were accompanied by increases in recall for six and seven year olds and adults. Recall improved for four and five year olds through the third order but declined at the fourth. The latter finding was attributed to deficits in semantic structures and memory processes in four and five year olds. The former finding was interpreted as an index of the development of general linguistic processes.

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