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FYI - I replicated your table() function by copy-and-paste, and it works correctly, as far as I can see. So if a problem remains, it is not in the table() function; it must be something else in your

Because the series of sidebands extend infinitely, a radio receiver will truncate the sidebands that extend beyond its bandwidth. An interesting consequence of this is that the demodulated signal will

Thank you.

See * BF970 PNP model * created using Parts release 6.3a on 09/06/96 at 10:34 * Parts is a MicroSim product. .MODEL BF970 PNP + IS=10.000E-15 + BF=50 + VAF=100 + IKF=10.000E-3 + VAR=100 +

Indeed, if the frequency is always changing, you won't get a clean FFT and interpretation could be challenging.? I suppose you could try the FFT of only one cycle, or as few cycles as possible, to

Since you did not upload a schematic, it is really hard to tell. It is possible that your line with the table is too long.? Did you enter the line (the one starting with B1) as a SPICE Directive

BF970 is an PNP transistor for UHF band (fT=1000 MHz) from Vishay. I visited Vishay site but there was no sign of BF970 (very old). I hope its spice model exists somewhere or of equivalent UHF PNP

The clue was that LTspice always failed to find the initial solution, i.e. the matrix state at time=0, rather than failure mid-way through the analysis, which is what happens in some problems. From

Hello Tony, I hope you're doing well ? Thanks you so much for your help, indeed it works on my side too with "startup" option. How did you find that ? It's almost magic for me :) However, I didn't try

If the frequency constantly changes (so that no cycle of the signal is the same as the cycle before or after), then the FFT will NOT show discrete frequencies. At best it will be difficult to

None of your links (blobs???) work. They all return 404 - Page not found. ?Upload your .ASC file AND all the other files required to run the simulation, but not .RAW? and .LOG files or pictures,?

Hi! I try to model an inductor using table. When i simulate this inductor, inductance value initially is changed according to the table that i include, but close to end off table inductance value

Always remember that whatever time interval you choose, if the "ends" don't meet, it compromises the FFT.? In other words, MUST have an exact whole number of cycles, or FFT suffers. Also, if the

Of course you know this, but the FFT of a short segment Tx of a signal assumes that the segment repeats with period Tx. There are special algorithms that give 'useful' output in such cases (e.g. SFFT

Hi, John: I didn't see it in the help, but I saw it in the pop-up menu when doing FFT. I upload the screenshot of this pop-up menu.

Yes. Look at the Help for Waveform Arithmetic. At the end you can see an FFT set-up pane that allows start and end times for the FFT to be set up.

Hi, : May I ask about FFT feature ? If in a waveform viewer, I want to do FFT analysis of a chosen node, which may has multiple frequency components varying during whole simulation time interval. Can

Hi, Andy: Your suggestions are absolutely correct! I just tried, 1. Modify the PWL's Trise = 1u (from 10n), Tfall = 1u (from 10n), the peaks are eliminated. 2. modify R1 = 5.1K, C1=10nf with unchanged

Hi, Andy: Sorry, forgot it. May I ask, how old are you ?

Hi, Andy: Thank you for the reply. At the first, the purpose is to seek a good C/P solution, to generate a varying, mostly sawtooth or triangle waveform and inject it into some Vref pin of PWM IC. The