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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
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Old 27th May 2020, 09:50 PM   #2041
brian92fs is offline brian92fs  United States
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Here's an example. It shows the ideal 0% distortion.

The math for the timestep is: sample time / 262144.

So, four cycles at 1KHz is 4ms / 262144 = 15.25878906ns. This is probably an overkill. You could use some factor of 262144 and likely get the same result. I'm also starting after 1 cycle to let the initial operating conditions settle. Probably not needed in a circuit like this without any capacitors. But its shown for illustrative purposes.
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Last edited by brian92fs; 27th May 2020 at 09:59 PM.
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Old 28th May 2020, 06:34 AM   #2042
bordodynov is offline bordodynov  Belarus
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Old Yesterday, 01:44 PM   #2043
alephotos is offline alephotos  Italy
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Default Ciuffoli's power follower simulation

Hi, I'm running a simulation of Ciuffoli's power follower, all measurements are very well but in measuring the distortion I get the sinusoids of Vin and Vout equal and perfectly superimposed, what is not working?
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Old Yesterday, 02:35 PM   #2044
brian92fs is offline brian92fs  United States
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
That sounds right. What are you expecting from a power buffer? Attaching a schematic or asc file would help.
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Old Today, 11:43 AM   #2045
alephotos is offline alephotos  Italy
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Here is the scheme.
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File Type: jpg vin.JPG (90.7 KB, 19 views)
File Type: jpg Vout.JPG (74.9 KB, 19 views)
File Type: jpg power follower.JPG (371.7 KB, 20 views)
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Old Today, 12:39 PM   #2046
Mooly is offline Mooly  United Kingdom
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Looks about right to me as well. As Brian says, it's a buffer. Voltage gain of <1 but lots of current gain.
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