LINK ORIGINAL
http://mexalib.com/view/23097
LINK FORMATO DJVU
http://mexalib.com/download/23097
"OBRIGADO DEUS PELA VIDA,PELA MINHA FAMILIA,PELO TRABALHO,PELO PÃO DE CADA DIA,PROTEGENOS DO MAL"
“SE SEUS PROJETOS FOREM PARA UM ANO,SEMEIE O GRÂO.SE FOREM PARA DEZ ANOS,PLANTE UMA ÁRVORE.SE FOREM PARA CEM ANOS,EDUQUE O POVO.”
“Sixty years ago I knew everything; now I know nothing; education is a progressive discovery of our own ignorance. Will Durant”
segunda-feira, 7 de março de 2016
domingo, 6 de março de 2016
Novgorodtsev A. Calculation of electrical circuits in MATLAB (2004)-Новгородцев А. Расчет электрических цепей в MATLAB (2004)
LINK ORIGINAL EN LA WEB
http://mexalib.com/view/15481
LINK DIRECTO EN FORMATO DJVU
http://mexalib.com/download/15481
LINK ALTERNATIVO EN FORMATO PDF
http://www.mediafire.com/download/binhbifxrwb2l8d/Novgorodtsev_A._Calculation_of_electrical_circuits_in_MATLAB_%282004%29.pdf
quinta-feira, 3 de março de 2016
KS Gorshkov, V. Tokarev, VV Filaretov SYNTHESIS AND ANALYSIS ELECTRICAL CIRCUITS-Анализ и синтез электрических цепей -К. С. Горшков, Ю. В. Токарев, В. В. Филаретов
quarta-feira, 2 de março de 2016
Matrix method of analysis of electric circuits Melnikov-Матричный метод анализа электрических цепей Мельников Н.А.
Matrix method of analysis of electric circuits Melnikov NA
The book presents the fundamentals of the generalized method of analysis Set the mode of complex equivalent circuits of electric circuits on the basis of application of the device matrix and the elements of a topological graph theory.
LINK ORIGINAL FORMATO DJVU
http://mexalib.com/download/22978
LINK ALTERNATIVO FORMATO PDF
http://www.mediafire.com/download/pr7w4ualg6v60pa/Matrix_method_of_analysis_of_electric_circuits-Melnikov.pdf
quinta-feira, 18 de fevereiro de 2016
A Design and Fabrication of PWM Power Amplifier for Digital Audio signal Jun-Sung, Lee Dept. of Electronical and Computer Engineering The Graduate School SungKyunKwan University
Amplifier for Digital Audio signal
Jun-Sung, Lee
Dept. of Electronical and Computer Engineering
The Graduate School
SungKyunKwan University
Amplifiers in electronics are used in a wide variety of applications in audio, video and telecommunications. Conventional amplifiers such as Class-A, Class-B, Class-AB based on linear circuit technology have good distortion characteristics, but yield poor efficiency and need large size of cooling material. On the other hand, the Class-D amplifier has good efficiency and small size, but relatively bad Total Harmonic Distortion(THD) and Signal to Noise Ratio(SNR) because of a switching mode operation. Recent researches have demonstrated the feasibility of realizing an almost complete digital audio system. The characteristics of THD and SNR of the Class-D amplifier depend on the duty ratio, rising falling and settling time of output PWM(Pulse Width Modulation) signals. This paper presents a one-chip monolithic integrated circuit(IC) of the two-channel Class-D audio power amplifier with high efficiency and lower THD using a 0.65[㎛], 40[V] bCDMOS process. Each channel can drive 50[W] power and a single channel power of 100[W] can be obtained through the external control signal. The Class-D amplifier at the output stage is controlled by generating a PWM signal. The conversion of the digital audio data to PWM pulse stream is performed by using PCM to PWM converter and results in the elimination of the THD. The results of the study are as follows: 1. The design and implementation of a 2-channel Class-D amplifier using 40[V] bCDMOS technology and the evaluation on the performance of designed class-D amplifier through fabricated wafer. ① The size of die is 3,700[㎛]×5,100[㎛]. The output power transistor occupies 60[%] of the die area. The output current driving capability and on-resistance are mainly considered features. ② The THD is 0.07[%] at 1[W] output power. ③ The Efficiency is 92[%] at 20[W] output power. The efficiency is getting worse when the output power is below 5[W] and above 35[W]. At a lower power consumption mode, the internal power takes up a larger portion of the total power. On the other hand, at a high power mode, power consumed by the resistance of bonding wire, routing metal and on-resistance of the MOS transistor are more dominant. These results are obtained by measuring selected samples out of packaged products. But, Some parts of the circuit need improvement before the mass production.
LINK
http://www.mediafire.com/view/ci41jtvncuyxdd0/PWM_POWER_AMPLIFIER.pdf
Assinar:
Postagens (Atom)