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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 9th June 2019, 05:20 PM   #1711
keantoken is offline keantoken  United States
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You can plot capacitance directly by following this:

Installing and using LTspice IV (now including LTXVII). From beginner to advanced.

Note that it's not capacitance unless the curve is flat. So you will see that the input impedance is only capacitive in a certain frequency range if your amp has an input resistor.
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Old 13th July 2019, 05:17 AM   #1712
jan.didden is offline jan.didden  Europe
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Slightly OT but can't find a better fit:

Found this in another forum on LTspice, anybody can shine some liht on this:

Analog Devices--which now owns Linear Technology--has begun offering a simulation package called Isim-PE. Has anyone in this group used this program? Can you compare is with LTSpice-XVII?

Renesas bought an electronics company that had a version of Isim-PE that I've worked with. It has a limit of 50 analog nodes in a circuit. I was trying to simulate a circuit containming two fully-differential op-amps and other components, and it said I had too many nodes.


If you Google Isim-PE there's some info but not related to ADI.

Jan
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Last edited by jan.didden; 13th July 2019 at 05:22 AM.
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Old 13th July 2019, 09:33 AM   #1713
FdW is offline FdW  Netherlands
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
https://www.eeweb.com/profile/inters...alog-ic-design

Not much light
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Old 31st July 2019, 01:03 PM   #1714
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Default Simulating tolerances in passive components

Hi Mooly and the guys here. I want to simulate a linear regulator with a 6FM7 and 6K11, properly working in real world. I would want to simulate it with some variations in the reference neon lamp (Ne4) automatically, like 75Ī5V and how it reflects in the performance of the device. How to do it if possible?
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File Type: gif Reguleta.GIF (20.0 KB, 99 views)
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Old 31st July 2019, 02:32 PM   #1715
FdW is offline FdW  Netherlands
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Installing and using LTspice IV (now including LTXVII). From beginner to advanced.
Do a voltage source in series with the neon-lamp, make it a AC +/- 5V signal and there you go

P.s. As the voltage source has zero impedance it will not interfere with parameters of the neon-lamp.
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Old 31st July 2019, 04:24 PM   #1716
Osvaldo de Banfield is offline Osvaldo de Banfield  Argentina
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Good idea, Sir. Many thanks.
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Old 6th August 2019, 06:54 PM   #1717
radtech is offline radtech  United States
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Quote:
Originally Posted by Osvaldo de Banfield View Post
I would want to simulate it with some variations in the reference neon lamp (Ne4) automatically
You might also look into Monte Carlo and Worst Case analysis.
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Old 7th August 2019, 10:24 AM   #1718
triode_al is offline triode_al  Netherlands
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I use the following 2SK389 model:
Quote:
.model 2sk389 NJF
+ Beta=51.76m Rs=8.008 Rd=8.008 Betatce=-.5 Lambda=11.22m
+ Vto=-.5275 Vtotc=-2.5m Cgd=18.28p M=.3367 Pb=.3905 Fc=.5
+ Cgs=20.07p Isr=112.8p Nr=2 Is=11.28p N=1 Xti=3 Alpha=10u Vk=100
+ Kf=92.85E-18 Af=1)
*SRC=2SK389;QSK389;JFETs N;Gen. Purpose;50V 10mA
This turns out to be 10.5 mA Idss.

My devices however are 7.5 mA Idss. Is there any parameter I can change to get it into synch with my real device?
regards albert
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Old 17th August 2019, 09:39 AM   #1719
dch53 is offline dch53  Australia
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Default How to improve simulated vs measured filter frequency response?

Hi, I'm changing the crossover points in a 4-way tube crossover that I didn't build. I'm having trouble getting the simulated and measured frequency responses to match. Specifically, the simulated crossover point (~-7dB for an 18dB slope) is 35Hz. The measured crossover point is 65Hz. I've attached the model of the bass filter, schematic, simulated frequency response and measured frequency response. Can anyone suggest how I might improve the match between the simulated and actual frequency responses please? I know the filter should be driven from a low impedance source but I didn't design it and I have to work with what I've been given.

Thanks!
Attached Images
File Type: png 35Hz Low Pass schematic.png (96.5 KB, 33 views)
File Type: png Simulated frequency response.png (141.9 KB, 31 views)
File Type: png Measured frequency response.png (95.0 KB, 29 views)
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File Type: zip 35Hz Low Pass model.zip (2.2 KB, 2 views)
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Old 17th August 2019, 09:46 AM   #1720
jan.didden is offline jan.didden  Europe
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What could explain the differences are the source impedance driving the filters and the load impedance terminating the filter circuit. Are those the same in both situations, including the 'hidden' anode impedance of the filter driver tube?

Jan
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