oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
A Brief Review: Stage-Convertible Power Amplifier Using Differential Line Inductor  [PDF]
Jonghoon Park, Changhyun Lee, Changkun Park
Wireless Engineering and Technology (WET) , 2012, DOI: 10.4236/wet.2012.34027
Abstract: In this review article, a stage-convertible RF power amplifier designed with a 0.18-μm RF CMOS process is described. A method to implement a low-power matching network is an essential technology for the stage-convertible power amplifier. Various low-power matching networks with distributed active transformers as an output power combiner are compared in terms of the amounts of undesired coupling, the chip size, and the amount of power loss. The feasibility of a differential line inductor for the stage-convertible power amplifier is assessed and explained. Finally, we show that the differential line inductor is a realistic means of reducing the overall chip size, enhancing the quality factor of the matching network, and minimizing the undesired coupling between the inter-stage matching network and any output matching network. Additionally, the operating mechanism of the stage-convertible power amplifier using the differential line inductor for a low-power matching network is described in detail.
Single amplifier biquad based inductor-free Chua's circuit  [PDF]
Tanmoy Banerjee
Physics , 2012,
Abstract: The present paper reports an inductor-free realization of Chua's circuit, which is designed by suitably cascading a single amplifier biquad based active band pass filter with a Chua's diode. The system has been mathematically modeled with three-coupled first-order autonomous nonlinear differential equations. It has been shown through numerical simulations of the mathematical model and hardware experiments, that the circuit emulates the behaviors of a classical Chua's circuit, e.g., fixed point behavior, limit cycle oscillation, period doubling cascade, chaotic spiral attractors, chaotic double scrolls and boundary crisis. The occurrence of chaotic oscillation has been established through experimental power spectrum, and quantified with the dynamical measure like Lyapunov exponents.
A HIGH Q LARGE INDUCTOR SIMULATION USING AN INTEGRATED OPERATIONAL AMPLIFIER
集成运放高Q模拟大电感

Zhang Feng-xiang Shao Qian-fen,
张凤祥
,邵倩芬

电子与信息学报 , 1982,
Abstract: In this article, a high Q large inductor simulation (L = 1H, Q = 252) using an integrated operational amplifier is described. Its Q value is 16 times as great as the inductor simulation (Q = 15.8) using an integrated operational amplifier deseribed in references1, 2]. As an example, a design method of L = 100 H, Q = 100 inductor simulation using an mtegrated operational amplifier is also given.
Feasibility of Tunable Amplifier and Bandpass Filter for Mobile Handsets Using Active Inductor Circuits  [PDF]
J. Rodriguez Tellez,N. T. Ali,B. Majeed
Active and Passive Electronic Components , 2002, DOI: 10.1080/08827510214372
Abstract: In this paper active inductor circuits are employed to assess their suitability for providing a tuning function in GaAs MMIC circuits. The specifications for a mobile handset amplifier and a bandpass filter operating from a 3 V supply rail are used as test vehicles. The design and simulation of the circuits employs a low-cost commercially available low pinch-off GaAs MESFET process. The suitability of active inductors for tuning in such applications considers issues such as frequency tuning range, noise, power consumption and stability.
Design of CMOS Tunable Image-Rejection Low-Noise Amplifier with Active Inductor  [PDF]
Ler Chun Lee,Abu Khari bin A'ain,Albert Victor Kordesch
VLSI Design , 2008, DOI: 10.1155/2008/479173
Abstract: A fully integrated CMOS tunable image-rejection low-noise amplifier (IRLNA) has been designed using Silterra's industry standard 0.18 ¢ € ‰ m RF CMOS process. The notch filter is designed using an active inductor. Measurement results show that the notch filter designed using active inductor contributes additional 1.19 ¢ € ‰dB to the noise figure of the low-noise amplifier (LNA). A better result is possible if the active inductor is optimized. Since active inductors require less die area, the die area occupied by the IRLNA is not significantly different from a conventional LNA, which was designed for comparison. The proposed IRLNA exhibits S21 of 11.8 ¢ € ‰dB, S11 of ¢ ’17.8 ¢ € ‰dB, S22 of ¢ ’10.7 ¢ € ‰dB, and input 1 ¢ € ‰dB compression point of ¢ ’12 ¢ € ‰dBm at 3 ¢ € ‰GHz
A novel power amplifier structure for RFID tag applications
一种应用于RFID标签的新型功率放大器设计

Deng Jianbao,Zhang Shilin,Li De,Zhang Yanzheng,Mao Luhong,Xie Sheng,
邓见保
,张世林,李德,张艳征,毛陆虹,谢生

半导体学报 , 2011,
Abstract: A novel matching method between the power amplifier (PA) and antenna of an active or semi-active RFID tag is presented. A PCB dipole antenna is used as the resonance inductor of a differential power amplifier. The total PA chip area is reduced greatly to only 240 × 70 μm2 in a 0.18 μm CMOS process due to saving two on-chip integrated inductors. Operating in class AB with a 1.8 V supply voltage and 2.45 GHz input signal, the PA shows a measured output power of 8 dBm at the 1 dB compression point.
MMCC Based Electronically Tunable Allpass Filters Using Grounded Synthetic Inductor  [PDF]
Rabindranath Nandi, Palaniandavar Venkateswaran, Mousiki Kar
Circuits and Systems (CS) , 2014, DOI: 10.4236/cs.2014.54011
Abstract:

New circuit implementations of electronically tunable first and second order allpass filter (AP) structures using a Multiplication Mode Current Conveyor (MMCC) building block are presented. The control voltage (V) of the MMCC tunes the desired phase (θ) while the time constant (τ) is adjustable by a Differential Voltage Current Conveyor Transconductance Amplifier (DVCCTA)-based synthetic lossless grounded inductor (L). The circuits are analyzed taking into account the device imperfections which show low active sensitivity features of the designs. The effects of port transfer error (ε) and that of the parasitic capacitances of the active devices had been meticulously examined which indicated that certain deviations in nominal design equations occur; these however, could be minimized with appropriate choice of the circuit passive components. Readily available AD-844 type Current Feedback Amplifier (CFA) elements are utilized for the topology implementation. Satisfactory test results on electronic θ-tunability, upto about 300 KHz, had been verified by PSPICE simulation and with hardware experimentation.

Differential Difference Current Conveyor Transconductance Amplifier: A New Analog Building Block for Signal Processing  [PDF]
Neeta Pandey,Sajal K. Paul
Journal of Electrical and Computer Engineering , 2011, DOI: 10.1155/2011/361384
Abstract: A new active building block for analog signal processing, namely, differential difference current conveyor transconductance amplifier (DDCCTA), is presented, and performance is checked through PSPICE simulations which show the usability of the proposed element is up to 201 MHz. The proposed block is implemented using 0.25 μm TSMC CMOS technology. Some of the applications are presented using the proposed DDCCTA, namely, a voltage mode multifunction filter, a current mode universal filter, an oscillator, current and voltage amplifiers, and grounded inductor simulator. The feasibility of DDCCTA and its applications is confirmed via PSPICE simulations.
Realization of Resistorless Wave Active Filter using Differential Voltage Current Controlled Conveyor Transconductance Amplifier
N. Pandey,P. Kumar
Radioengineering , 2011,
Abstract: In this paper, a resistorless realization of high order voltage mode wave active filter based on Differential Voltage current controlled conveyor transconductance amplifier (DVCCCTA) is presented. The wave method is used for simulating reflected and incident wave for basic building block i.e. series inductor and configuring it for other passive element realization by making appropriate connection. The proposed structure uses grounded capacitors and possesses electronic tunability of cutoff frequency. The proposed approach is verified for a 4th order low pass filter through SPICE simulation using 0.25μm TSMC CMOS technology parameters.
The Pricing of Convertible Bonds with a Call Provision  [PDF]
Bin Zhang, Dianli Zhao
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.46117
Abstract: This paper deals with the pricing of convertible bond with call provision based on the traditional B-S formula. By applying the principle of no arbitrage, the partial differential equation for the bond is established with identified boundary conditions, which solution results in the closed form of the pricing formula.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.