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36 Threads found on edaboard.com: Fundamental Period
have a doubt reg checking DT periodic sequence: x=cos(pi* (n)^2 / 8 ) it is periodic ofcourse, but in the solution manual its fundamental period is mentioned as 8. but i got fundamental period=N=(2*pi/ omega ) in this case, N= (2*pi / (pi/8) ) = 16. does anybody know (...)
The greatest-common-divisor of f1 and f2 is the fundamental frequency; the least-common-multiple is the fundamental period. I think the first example is what you're looking for:
the scaling in the time in the angular frequency never hampers the periodicity it just alters the fundamental period of the signal that is cos t is periodic and also cos 2t is periodic both have only 1 difference that is their fundamental period differs in both the case (...)
Hi all, i am new to Matlab.Could anyone help me to generate and plot the below 3 sequences using Matlab "stem" function What should i define in my script? x1=sin(0.6Пn+0.6П) x2=sin(0.68Пn) x3=3sin(1.3Пn)-4cos(0.3Пn+0.45П) thanks alot regards scdoro
Hi all, i am new to Matlab.Could anyone help me to generate and plot the below 3 sequences using Matlab "stem" function qn1) What should i define in my script? qn2) how do i obtain the fundamental period by just observing the graph? x1=sin(0.6Пn+0.6П) x2=sin(0.68Пn) x3=3sin(1.3Пn)-4cos(0.3Пn+0
Note that For a discrete-time signal to be periodic it has to satisfy x=x where N is the fundamental period and the condition on it is that it should be an integer. For a continuous-time signal to be periodic it has to satify x(t+T)=x(t) where T is the fundamental period and there is no r
Generally, we can use two types of 'reset'. The one is syncronous reset. Another is asyncronous reset. I have a fundamental question about this reset. What is the purpose of two types' reset? When do we have to adopt sync reset to the HDL? When do we have to use async reset to the HDL? Why do the two type of resets exist? I do not ex
Ok, I located the example problem. Frankly, I dont understand your question. Are you speaking about Figure 3.7? The figure explains the effect of different fundamental period T of the rectangular pulse. If T = 4T1, meaning, the rectangle pulse lying in the origin extents from -2T1 to 2T1 and if T = 8T1, then same lies between -4T1 to 4T1. In
Your ECG signal has very low amplitude at the fundamental frequency, so a plain FFT would give you poor info. It would be better to apply some sort of non-linear filter to it first, such as computing fft(ECG_1 > 0.5) instead of fft(ECG_1). This example shows the first strong spectral peak at about 1.23 Hz. Zoom in to see it: clear; lo
Is x = cos periodic. If yes, find its period The answer given is: periodic. period =8 How to solve this problem? since ω=2Πf assume signal is cos wn so f=1/8 since f is expressed as the ratio of 2 inteer so it is periadic we have the condition of periodicity f=k/N where N is (...)
If you cascade self-multipliers you can get the higher order tones but I think you will be hard pressed to keep them in the phase you'd like, across a wide / high frequency range. You would want the natural delay through the multipliers to be much, much less than the fundamental period (few degrees, more like) if you want to see a pretty squ
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Why does autocorrelation function approach zero at the fundamental period of a signal?
I'd use the cross() calculator function looking for the right-sense zero crossings, and do the arithmetic to turn time into degrees. Timebase being the fundamental period of whichever phase you call the master reference.
Need help here what is the fundamental period for sinπt??? I got it down to T=6/(2n-1) and i am confuse from here on :(
Well if you're just simulating, then it should be a matter of getting the raw data and dumping it into matlab, then doing an FFT. Or you could build the simulation entirely in matlab. Try to make sure that either the duration of the sampled data is an exact integer multiple of your fundamental period, otherwise you'll end up with an incorrect resul
Hi, The calculator toll from spectre has a built in THD function which you will find if you selectthe RF option or in the "Special functions" menu. In order to use this function you have to perform a transient simulation for at least 20 periods of the input signal and then select the waveform on which you want to evaluate the distorsions, in inp
oh yeh you are rite...stupid i am... just dun realize the fundamental stuff..
Elektor magazine UK edition issue july/august 2004 has a circuit like you want. With a 10 MHz crystal and using a 74HC04 and some notch and high-pass filters, it can multiply the frequency by 9, obtaining 90MHz @ +13 dBm. Each stage of inverters and filters rejects the fundamental signal generated by a a squarewave oscillator and the high-pass
The .MEASURE statement prints user-defined electrical specifications of a circuit and is used extensively in optimization. The specifications include propagation, delay, rise time, fall time, peak-to-peak voltage, minimum and maximum voltage over a specified period, and a number of other user-defined variables The .MEASURE statement has several
It´s relatively simple: 1.) Perform a TRAN-Analysis and measure exactly the period resp. frequnecy. (Hint: Don´t use the PSPICE macro for this - it is not exact enough) 2.) Perform another TRAN-Analysis with FOURIER enabled (specify the fundamental carrier) 3.) Check the output file *.out. At the end of the file you will find the leve
Hello everyone ,I am making a power meter based on ADE7753 IC . I started off 1 month ago ,had many problems in between.One of the major problem was SPI communication . I have used PIC16F72 as the master controller.Now am able to read all the registers and also able to calculate voltage and current. I want to know whether ADE775
Hi guys, i just recently succeeded with functioning stepper motor with PIC and UCN5804B, so i just did a fundamental test on stepper motor by pumping in different speed in the coding, but with 50% duty cycle. So i tried with 16ms period until 1.5 ms period, so 16 ms makes the motor slow and 1.5 ms makes it fast. i understand how
svaidy, The method proposed by harii74 will work for sinusoidal load currents. However, for non-sinusoidal currents, the problem is more complex. By definition, power factor is equal to real power divided by apparent power. Apparent power can be obtained by measuring the True RMS current, and the true RMS voltage. Apparent power is the product
innovation1, The difference can be explained from the fundamental equations. . For an inductor, v = Ldi/dt, Where V is the voltage across the inductior, L is the inductance, di/dt is the rate of change of current thru the inductor. For high frequencies, di/dt is a high value, therefore the voltage across the inductor is high. For DC, di/dt is
As you could see in Illustrating the sine wave's fundamental relationship to the circle. on wikipedia... Its actually a plotting over the circle consider r=sinΘ now for all different values of Θ you will get different values of r.. now if you had to plot r versus Θ.. then one convenient way is to plot values of r (as
hi Also I have the above problem. Why there is not any newer version of "simulating switched-capacitor filters with spectreRF" document for spectreRF2008? In the above doc the netlist defines only the period and maxacfreq; while in specreRF there are so more parameters required, for example "fundamental tones" and beat frequency simultaneusly. A
This example might be nice: Radar Basics - Fourier Transformation You see how a rectangular waveform is built from the fundamental sinewave with harmonics
Subharmonic drive is an interesting idea. but the spectral share of 5th harmonic is only 1/5 of the fundamental for a square wave (and getting absolutely smaller when reducing the duty cycle), so I fear, it won't lead to an effective design. Driving MOSFETS to ns switching speed requires strong gate drivers with several A output current, usually
Specific resistance of power devices is very often given in these strange units of r=mOhm*mm2 so that people can quickly estimate device area A for the required Rdson value: Rdson = r / A A more fundamental parameter is specific resistance of the device in Ohms per one micron of gate width - rch. If you have SPICE model of the device, rch can be
I have a sampled sine wave of a 10kHz signal. It was sampled at 1Msps (1Mhz) so there is 100 samples per period. The total vector is 1024 samples long so its just over 10 periods total. I have measured the THD of the analog signal using the fft function of a tektronix scope and I know the correct THD to be less than 1%. However, when I try to
It could either be a sine wave or a square wave. If the reference frequency is very low (i.e. less than a few MHz) a square wave is better. It can have harmonics, as long as they are somewhat lower than the fundamental. An arbitrary waveform will have various phase and amplitude modulations, which could look like random time jitter. This will
You need to ask yourself what Omega means. It is not simply the angular frequency in the sin / cos term. The overall function x is periodic, as implied by the N=19, so you can come up with the fundamental angular frequency corresponding to this period, and it is 2*pi/19.
In mathematics, the discrete Fourier transform (DFT) converts a finite list of equally-spaced samples of a function into the list of coefficients of a finite combination of complex sinusoids, ordered by their frequencies, that has those same sample values. It can be said to convert the sampled function from its original domain (often time or positi
Hi I am designing a switching amplifier with 300MHz switching frequency and 20MHz input frequency. I was doing the pss analysis in spectre RF and found out that the software is considering 300MHz to 299.91MHz. Because of this software is giving the following error while running pss analysis. ERROR, (CMI-2207): V1: The fundamental frequency
Setup time is a flip-flop specification that is typically provided to you by a manufacturer, and is relative to a single clock edge into a flop. However, setup-violation occurs when one driving flop feeds a signal into a second receiving flop, and the propagation of the signal between them takes too long (due to logic and routing delays). There is