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From: "Edward Rawde" <invalid@invalid.invalid>
Newsgroups: sci.electronics.design
Subject: Re: Current mirror version of the lowish distortion 1kHz sine wave osillator
Date: Wed, 22 Jan 2025 18:56:19 -0500
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"Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vmpj6v$i521$1@dont-email.me...
> On 22/01/2025 12:32 pm, Bill Sloman wrote:
>> On 22/01/2025 3:58 am, Edward Rawde wrote:
>>> "Edward Rawde" <invalid@invalid.invalid> wrote in message news:vmogqg$23tl$1@nnrp.usenet.blueworldhosting.com...
>>>> "Bill Sloman" <bill.sloman@ieee.org> wrote in message news:vmninh$3t6oi$1@dont-email.me...
>>>>> On 21/01/2025 2:19 am, Bill Sloman wrote:
>>>>>> On 15/01/2025 11:33 pm, Bill Sloman wrote:
>
> <snip>
>
>> It is running on LTSpice 17.0 on Windows 7, and I do have to download 17.1, which I'm going to do right now.
>
> What you get if you are running Windows 7 is version 17.0.36.0, which may explain the difference. The sim runs just as fast on the 
> newly uploaded software. It's unlikely that John May has stuck to Window 7. and he has reported here that he is getting the same 
> kind of speed.
>
> Don posted much the same observation earlier.

I put LTSpice XVII(X64) (17.0.34.0) in the administrator account of an older core i5 2.8GHz (not SSD) running Windows 11 home 23H2.
I'll be upgrading it to Windows 10 pro when I get a chance.
I didn't install any suggested LTSpice updates.
U1 was out of position but this time I had to move it up and connect the -ve power rail.
Simulation speed varies between about 6ms/s and 15 ms/s.
Vout shows a single transient at startup which peaks at about 600mv pk and settles to a constant level of around 100mV pk in a few 
hundred ms.
FFT of a sample of about 100ms near 10s with Blackman Harris window shows 1kHz a little below -20dB,
2kHz -90dB (so at least 70 dB down on 1 kHz)
3kHz -70dB
4kHz -85dB
5kHz  -75dB
There are no higher peaks or crud at higher frequencies.
The raw file didn't go above 1.1 GB

Now move exactly the same circuit to LTSpice 24.1.0 on a core i7 SSD Windows 10 pro 22H2.
LTSpice component updates available today 22 Jan 2025 were also installed.
U1 now has to be moved down and the +ve rail has to be connected.
Note that after saving the file in 24.1.0 the version at the top of the file becomes 4.1
Take a sample of about 10us of Vout between 300-350us and do FFT with Blackman-Harris window.
This shows a peak of -43dB at 24MHz and the next highest peak -93dB at 400MHz.
Zoom to fit and watch progress. Reported speed is about 25us/s.
Leave simulation running and do some other work.
Come back after an hour and find it has peaked at 600mV pk after 86ms simulation time and is now falling.
Take a sample of a few cycles at 86ms and run FFT with Blackman-Harris window.
1kHz -9dB
2kHz -95dB
3kHz -85dB
4kHz -110dB
24MHz -63dB
raw file has reached 40GB and simulation time is now 130ms. Level is 200mv pk and still falling
Level seems reasonably stable (100mv pk) at 220ms but take a sample and you can see it has parasitic HF crud in it.
raw file has now reached 74GB. Stop simulation.

All signal amplitude levels given are pk. pk-pk would be twice.

To avoid any doubt of what I'm simulating, it's below.

Version 4.1
SHEET 1 3608 920
WIRE -1680 -2400 -1984 -2400
WIRE -1360 -2400 -1680 -2400
WIRE -1200 -2400 -1360 -2400
WIRE -1104 -2400 -1200 -2400
WIRE -736 -2400 -1104 -2400
WIRE -320 -2400 -736 -2400
WIRE 208 -2400 -320 -2400
WIRE 336 -2400 208 -2400
WIRE 576 -2400 336 -2400
WIRE -736 -2384 -736 -2400
WIRE 208 -2384 208 -2400
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WIRE 3376 -2272 -1616 -2272
WIRE 880 -2192 -1776 -2192
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WIRE -176 -2160 -320 -2160
WIRE 208 -2144 208 -2320
WIRE 336 -2144 208 -2144
WIRE -1200 -2112 -1200 -2400
WIRE -1680 -2096 -1680 -2400
WIRE -1360 -2048 -1360 -2080
WIRE -320 -2000 -320 -2160
WIRE -736 -1984 -736 -2160
WIRE -1776 -1968 -1776 -2192
WIRE 336 -1968 336 -2144
WIRE 576 -1968 576 -2400
WIRE -1360 -1920 -1360 -1968
WIRE -1200 -1920 -1200 -2032
WIRE 1952 -1920 1744 -1920
WIRE 2160 -1920 1952 -1920
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WIRE 1536 -1904 1376 -1904
WIRE 336 -1888 336 -1904
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WIRE 2288 -1776 2160 -1776
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WIRE -1264 -1728 -1360 -1728
WIRE -544 -1728 -544 -1792
WIRE 3088 -1728 3088 -1776
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WIRE -272 -1712 -272 -1808
WIRE -128 -1712 -272 -1712
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WIRE -32 -1712 -64 -1712
WIRE 2432 -1712 2432 -1776
WIRE -2064 -1696 -2064 -1792
WIRE -2016 -1696 -2064 -1696
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WIRE -2016 -1664 -2064 -1664
WIRE 1648 -1648 1392 -1648
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WIRE -848 -1632 -912 -1632
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WIRE -544 -1632 -784 -1632
WIRE -1200 -1616 -1200 -1680
WIRE -1200 -1616 -1360 -1616
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WIRE -912 -1616 -912 -1632
WIRE -912 -1616 -992 -1616
WIRE -272 -1616 -272 -1712
WIRE -144 -1616 -272 -1616
WIRE -32 -1616 -32 -1712
WIRE -32 -1616 -64 -1616
WIRE 2064 -1616 2064 -1648
WIRE 1392 -1600 1392 -1648
WIRE 1904 -1600 1904 -1824
WIRE 2032 -1600 1904 -1600
WIRE -2064 -1584 -2064 -1664
WIRE -544 -1584 -544 -1632
WIRE -512 -1584 -544 -1584
WIRE -432 -1584 -448 -1584
WIRE -272 -1584 -272 -1616
WIRE -272 -1584 -352 -1584
WIRE 1232 -1584 1232 -1760
WIRE 1360 -1584 1232 -1584
WIRE 2160 -1584 2160 -1776
WIRE 2160 -1584 2096 -1584
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WIRE 1536 -1568 1536 -1760
WIRE 1536 -1568 1424 -1568
WIRE 1584 -1568 1536 -1568
WIRE 1744 -1568 1744 -1808
WIRE 1744 -1568 1664 -1568
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