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 (...)
Digital Signal Processing :: 28.03.2009 01:43 :: rramya :: Replies: 10 :: Views: 10571
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:
Digital Signal Processing :: 08.07.2012 21:21 :: enjunear :: Replies: 1 :: Views: 1967
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 (...)
Electronic Elementary Questions :: 15.09.2012 12:46 :: jeffrey samuel :: Replies: 6 :: Views: 687
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?
Digital Signal Processing :: 16.01.2006 09:46 :: scdoro :: Replies: 2 :: Views: 2090
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?
Digital Signal Processing :: 17.01.2006 04:20 :: scdoro :: Replies: 0 :: Views: 521
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
Electronic Elementary Questions :: 17.02.2006 02:34 :: purnapragna :: Replies: 3 :: Views: 22425
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
PLD, SPLD, GAL, CPLD, FPGA Design :: 30.01.2007 08:38 :: perfectv :: Replies: 9 :: Views: 3808
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.
Digital communication :: 02.06.2007 14:56 :: cedance :: Replies: 4 :: Views: 1530
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:
Digital Signal Processing :: 29.09.2007 06:16 :: echo47 :: Replies: 23 :: Views: 8549
Is x = cos periodic. If yes, find its period
The answer given is: periodic. period =8
How to solve this problem?
assume signal is cos wn
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 (...)
Electronic Elementary Questions :: 16.01.2008 11:05 :: sundarmeenakshi :: Replies: 3 :: Views: 535
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
Analog IC Design and Layout :: 24.08.2010 10:13 :: dick_freebird :: Replies: 3 :: Views: 478
Digital Signal Processing :: 30.09.2010 00:40 :: gpffhdnzz :: Replies: 0 :: Views: 576
Why does autocorrelation function approach zero at the fundamental period of a signal?
RF, Microwave, Antennas and Optics :: 25.03.2011 02:54 :: pushpanjali sharma :: Replies: 0 :: Views: 447
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.
Analog Circuit Design :: 18.06.2012 11:54 :: dick_freebird :: Replies: 9 :: Views: 540
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 :(
Digital Signal Processing :: 21.03.2013 11:22 :: yjlum :: Replies: 5 :: Views: 311
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
Power Electronics :: 03.04.2013 08:48 :: mtwieg :: Replies: 5 :: Views: 502
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
Analog IC Design and Layout :: 14.01.2005 02:29 :: cristianb :: Replies: 4 :: Views: 1843
oh yeh you are rite...stupid i am... just dun realize the fundamental stuff..
Microcontrollers :: 20.01.2005 01:59 :: banh :: Replies: 5 :: Views: 534
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
Analog Circuit Design :: 21.03.2006 16:23 :: rkodaira :: Replies: 7 :: Views: 1504
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
Software Problems, Hints and Reviews :: 17.11.2007 11:13 :: mathuranathan :: Replies: 3 :: Views: 5589
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
RF, Microwave, Antennas and Optics :: 09.05.2008 09:07 :: LvW :: Replies: 1 :: Views: 620
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
Microcontrollers :: 22.12.2008 23:53 :: anishmvk :: Replies: 0 :: Views: 1454
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 it works (...)
Electronic Elementary Questions :: 08.04.2009 04:55 :: thavamaran :: Replies: 2 :: Views: 944
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
Electronic Elementary Questions :: 01.09.2009 13:04 :: Kral :: Replies: 9 :: Views: 3518
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
Electronic Elementary Questions :: 02.11.2009 11:28 :: Kral :: Replies: 8 :: Views: 4780
As you could see in
Illustrating the sine wave's fundamental relationship to the circle.
Its actually a plotting over the circle
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
Electronic Elementary Questions :: 27.02.2010 09:29 :: akshay_d_2006 :: Replies: 3 :: Views: 635
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
Analog IC Design and Layout :: 17.05.2010 10:53 :: ahmadagha23 :: Replies: 2 :: Views: 1398
This example might be nice:
Radar Basics - Fourier Transformation
You see how a rectangular waveform is built from the fundamental sinewave with harmonics
Electronic Elementary Questions :: 10.12.2010 06:18 :: volker_muehlhaus :: Replies: 13 :: Views: 2934
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
Analog Circuit Design :: 26.01.2011 12:25 :: FvM :: Replies: 35 :: Views: 2073
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
Analog IC Design and Layout :: 24.02.2011 01:13 :: timof :: Replies: 9 :: Views: 2763
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
Digital Signal Processing :: 28.02.2011 00:44 :: specialedster :: Replies: 1 :: Views: 2079
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
RF, Microwave, Antennas and Optics :: 05.10.2011 08:27 :: biff44 :: Replies: 3 :: Views: 578
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.
Electronic Elementary Questions :: 01.08.2012 21:53 :: gadly :: Replies: 1 :: Views: 288
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
Mathematics and Physics :: 25.04.2013 08:29 :: Debra :: Replies: 2 :: Views: 356
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
Analog IC Design and Layout :: 05.08.2013 02:48 :: viperpaki007 :: Replies: 0 :: Views: 262
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).
Electronic Elementary Questions :: 09.08.2013 11:33 :: jrwebsterco :: Replies: 1 :: Views: 198