Connect with us

Re: Measuring output impedance in LTSpice

Discussion in 'Electronic Design' started by Andrew Holme, Apr 2, 2011.

Scroll to continue with content
  1. Andrew Holme

    Andrew Holme Guest


    Version 4
    SHEET 1 880 680
    WIRE 64 0 -64 0
    WIRE 64 32 64 0
    WIRE -64 80 -64 0
    WIRE 0 80 -64 80
    WIRE 64 144 64 128
    WIRE 272 144 64 144
    WIRE 384 144 272 144
    WIRE 64 176 64 144
    WIRE 384 176 384 144
    WIRE -64 288 -64 80
    WIRE 64 288 64 256
    WIRE 384 288 384 256
    FLAG -64 288 0
    FLAG 64 288 0
    FLAG 384 288 0
    FLAG 272 144 PLOT_ME
    SYMBOL current 384 176 R0
    WINDOW 123 24 91 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName I1
    SYMATTR Value ""
    SYMATTR Value2 AC 1
    SYMBOL npn 0 32 R0
    SYMATTR InstName Q1
    SYMATTR Value 2N3904
    SYMBOL current 64 176 R0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName I2
    SYMATTR Value 1m
    TEXT 220 40 Left 0 !.ac dec 1000 1e6 100e6
    TEXT 496 160 Left 0 ;-->10^(28.33/20)\n ans =\n \n 26.091557
     
  2. Joerg

    Joerg Guest

    Minor problem: The vast majority of participants in NGs no longer has
    access to news servers that support binaries. Thus no attachments. Slow?
    C'mon, a bit spoiled? Remember the days when one had to wait for the
    arrival of the 11:00am flight and the tapes to be unloaded?

    Bitrex: The way you describe it is how it's usually done, almost.
    Sometimes a load or current is modulated to see how things are at higher
    frequencies. It is also customary to check switch-mode converters for
    load change behavior via pulsed loads.

    [...]
     
  3. Joerg

    Joerg Guest


    It does work if you apply the voltage via a resistor. IOW try to
    "wiggle" the output.
     
  4. Joerg

    Joerg Guest

    Yup. Any and all attachments. I've asked the guys at my (paid) server if
    they couldn't open 100k for attachments since they allow max 100k in the
    message body. The answer was a resounding "no way". Wouldn't make much
    sense anyhow, it doesn't do any good if only 1% of the others can read it.

    In Europe we had a really nice system, not sure if still available: We
    had the schedules of all those Intercity fast trains hanging on an
    office wall. If something urgent needed to get to Munich we'd sprint to
    the station, hand it over along with some cash, goes onto train. Called
    the guy in Munich to be at their station at around 4:00pm. Even with air
    freight today that's impossible unless you charter a plane.

    Nowadays many biz folks actually drive if the destination is within 300
    miles. Air travel has lost the advantage over short hauls because of the
    security wait.

    [...]
     
  5. Joerg

    Joerg Guest

    Well, shazam! It sure worked. Beats me why because the folks at the news
    server said it wouldn't. And in the past it hadn't. Probably the Hobbs
    coefficient was too low on all the others :)
     
  6. Jon Kirwan

    Jon Kirwan Guest

    And here it is autogenerated to ascii:
    Not entirely pretty, but the ASCII generator does what it can
    understand to do.

    Jon
     
  7. Joerg

    Joerg Guest

    No, it provided the attachment. I know for sure that a year ago it
    didn't because we tried it. Question is, how many other here in this
    exquisite club of soldering iron wielders are able to read the attachment?

    [...]
    I only drive such distances when there is no other reasonable
    connection. Many destinations north of here can be a problem, where you
    have no real choice other than taking the Interstate.
     
  8. Joerg

    Joerg Guest

    In the old days, about a year ago, such attachments were visible as such
    but no contents were transmitted. Now LTSpice has a minor problem
    running a simulation off of hot air. Although Mike Engelhardt could take
    an internship with a few politician's offices, they'll show him how
    that's done :)

    [...]
    Once you get to about 300 miles from here it is actually very pretty
    country. Like this:

    http://www.shastalake.com/images/shasta-lake-6-6-2006.jpg
     
  9. Joerg

    Joerg Guest

    Flux splatters on there, like Jan's? :)
     
  10. Grant

    Grant Guest

    Inline text attachment unencoded is still a copy/paste exercise, hardly
    painful, from my PoV as I sometimes do that from windows newsreader to
    a unix file.
    Nah...

    It's the people the retype the things and make copy mistakes! :eek:)

    Grant.
     
  11. Joerg

    Joerg Guest

    Provider is news.individual.de and reader is Thunderbird. As I said, now
    it works. To my surprise.

    I like the Superstition Mountains. A friend showed us Indian ruins in
    there. But you have to hike, it's well past where 4WD can go or is
    allowed to go. Might be a good thing, so that this part of history isn't
    being eroded by too many visitors.
     
  12. Grant

    Grant Guest

    Can that be done?

    And where's the command gone for adding a plaintext (ascii) attachment
    in Agent? Used to be easy to find, 'cos that's how I sent kernel patches.

    Grant.
     
  13. Guest

    You can also drag the file and drop it on the reply window. It'll either add
    it as an attachment or as inline text.
     
  14. Grant

    Grant Guest

    Thanks.

    Hmm, what I should do is start over with Agent without my decade old
    customised toolbars... Anyway, I found a dialog box that seems to give
    access to attachment properties. I forget when I don't use stuff for
    a few years.

    Grant.
     
  15. Grant

    Grant Guest

    One place I post to demands whitespace not be corrupted, <tab> converted to
    spaces a no no. I usually copy/paste stuff from terminal into a post, unless
    I have to follow that whitespace issue, elsewhere.

    I once posted a very small binary to usenet (aols) and it went through, no
    complaints, but anything goes up in the alt... area.

    Grant.
     
  16. Joerg

    Joerg Guest

    Same here. But it's a bit cumbersome. First you must store the file on
    your HD, then FTP it over to your web site, then type the whole path
    into the URL of your web browser, then copy the URL and paste into your
    post.

    Yesterday I saw that faint twinkle up there in the sky, way out there. I
    though that must be you, probably blew a circuit breaker in the hobby
    room on your spaceship :)
     
  17. Joerg

    Joerg Guest

    Ok, here is that test, a laser pump diode pulser. Nothing confidential,
    it was my contribution to a discussion in a European NG.



    Version 4
    SHEET 1 1388 804
    WIRE 80 -176 -944 -176
    WIRE 352 -176 176 -176
    WIRE 672 -176 448 -176
    WIRE 784 -176 672 -176
    WIRE 896 -176 784 -176
    WIRE 1008 -176 896 -176
    WIRE 1120 -176 1008 -176
    WIRE 1232 -176 1120 -176
    WIRE 672 -160 672 -176
    WIRE 784 -160 784 -176
    WIRE 896 -160 896 -176
    WIRE 1008 -160 1008 -176
    WIRE 1120 -160 1120 -176
    WIRE 1232 -160 1232 -176
    WIRE -944 -144 -944 -176
    WIRE 352 -144 304 -144
    WIRE 560 -144 448 -144
    WIRE 304 -96 304 -144
    WIRE 304 -96 -416 -96
    WIRE 304 -64 304 -96
    WIRE -208 -48 -272 -48
    WIRE -96 -48 -144 -48
    WIRE 560 -48 560 -144
    WIRE 672 -48 672 -96
    WIRE 672 -48 560 -48
    WIRE 784 -48 784 -96
    WIRE 784 -48 672 -48
    WIRE 896 -48 896 -96
    WIRE 896 -48 784 -48
    WIRE 1008 -48 1008 -96
    WIRE 1008 -48 896 -48
    WIRE 1120 -48 1120 -96
    WIRE 1120 -48 1008 -48
    WIRE 1232 -48 1232 -96
    WIRE 1232 -48 1120 -48
    WIRE -944 -32 -944 -64
    WIRE 560 -32 560 -48
    WIRE -624 16 -672 16
    WIRE -512 16 -560 16
    WIRE 560 64 560 48
    WIRE -176 96 -176 64
    WIRE -416 112 -416 -96
    WIRE -384 112 -416 112
    WIRE -272 112 -272 -48
    WIRE -272 112 -304 112
    WIRE -208 112 -272 112
    WIRE -96 128 -96 -48
    WIRE -96 128 -144 128
    WIRE -64 128 -96 128
    WIRE 160 128 160 -128
    WIRE 160 128 16 128
    WIRE -672 144 -672 16
    WIRE -624 144 -672 144
    WIRE -512 144 -512 16
    WIRE -512 144 -544 144
    WIRE -480 144 -512 144
    WIRE -208 144 -480 144
    WIRE 864 144 864 96
    WIRE 992 144 992 96
    WIRE -480 176 -480 144
    WIRE 304 176 304 16
    WIRE -672 192 -672 144
    WIRE -208 224 -208 208
    WIRE -176 224 -176 160
    WIRE -176 224 -208 224
    WIRE 864 256 864 224
    WIRE 992 256 992 224
    WIRE -672 304 -672 272
    WIRE -480 304 -480 256
    FLAG -944 -32 0
    FLAG -672 304 0
    FLAG 560 64 0
    FLAG 864 256 0
    FLAG 864 96 VDD
    FLAG 992 256 0
    FLAG 992 96 VEE
    FLAG -176 64 VDD
    FLAG -208 208 VEE
    FLAG 304 176 0
    FLAG -480 304 0
    SYMBOL voltage -944 -160 R0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName V1
    SYMATTR Value 2.2
    SYMBOL nmos 80 -128 R270
    WINDOW 0 105 -3 VRight 0
    WINDOW 3 75 -3 VRight 0
    SYMATTR InstName M1
    SYMATTR Value FDS6699S
    SYMBOL schottky 656 -160 R0
    SYMATTR InstName D1
    SYMATTR Value MBR735
    SYMATTR Description Diode
    SYMATTR Type diode
    SYMBOL voltage -672 176 R0
    WINDOW 3 -436 106 Left 0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR Value PULSE(-1 0.357 1u 1u 1u 300u 1m 1)
    SYMATTR InstName V2
    SYMBOL res 544 -48 R0
    SYMATTR InstName R1
    SYMATTR Value 100K
    SYMBOL schottky 768 -160 R0
    SYMATTR InstName D2
    SYMATTR Value MBR735
    SYMATTR Description Diode
    SYMATTR Type diode
    SYMBOL schottky 880 -160 R0
    SYMATTR InstName D3
    SYMATTR Value MBR735
    SYMATTR Description Diode
    SYMATTR Type diode
    SYMBOL schottky 992 -160 R0
    SYMATTR InstName D4
    SYMATTR Value MBR735
    SYMATTR Description Diode
    SYMATTR Type diode
    SYMBOL schottky 1104 -160 R0
    SYMATTR InstName D5
    SYMATTR Value MBR735
    SYMATTR Description Diode
    SYMATTR Type diode
    SYMBOL schottky 1216 -160 R0
    SYMATTR InstName D6
    SYMATTR Value MBR735
    SYMATTR Description Diode
    SYMATTR Type diode
    SYMBOL voltage 864 128 R0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName V3
    SYMATTR Value 20
    SYMBOL voltage 992 240 M180
    WINDOW 0 24 104 Left 0
    WINDOW 3 24 16 Left 0
    WINDOW 123 0 0 Left 0
    WINDOW 39 0 0 Left 0
    SYMATTR InstName V4
    SYMATTR Value 5
    SYMBOL res -400 128 R270
    WINDOW 0 66 47 VTop 0
    WINDOW 3 64 49 VBottom 0
    SYMATTR InstName R7
    SYMATTR Value 1K
    SYMBOL tline 400 -160 R0
    SYMATTR InstName T1
    SYMATTR Value Td=15n Z0=1.5
    SYMBOL cap -208 -32 R270
    WINDOW 0 32 32 VTop 0
    WINDOW 3 0 32 VBottom 0
    SYMATTR InstName C1
    SYMATTR Value 470p
    SYMBOL ind 288 -80 R0
    SYMATTR InstName L1
    SYMATTR Value 30n
    SYMATTR SpiceLine Rser=0.5m
    SYMBOL res -640 160 R270
    WINDOW 0 66 47 VTop 0
    WINDOW 3 64 49 VBottom 0
    SYMATTR InstName R2
    SYMATTR Value 4.99K
    SYMBOL res -496 160 R0
    SYMATTR InstName R3
    SYMATTR Value 1K
    SYMBOL cap -624 32 R270
    WINDOW 0 32 32 VTop 0
    WINDOW 3 0 32 VBottom 0
    SYMATTR InstName C2
    SYMATTR Value 6.6n
    SYMBOL res -80 144 R270
    WINDOW 0 66 47 VTop 0
    WINDOW 3 64 49 VBottom 0
    SYMATTR InstName R4
    SYMATTR Value 100
    SYMBOL Opamps\\LT1220 -176 64 R0
    SYMATTR InstName U1
    TEXT -952 64 Left 0 !.tran 0 350u 0
    TEXT 328 24 Left 0 ;Rser=0.5m
    TEXT 344 136 Left 0 ;L1 stellt den Messwiderstand
    TEXT 344 160 Left 0 ;mit Induktivitaet dar.
    TEXT 232 -200 Left 0 ;V(n002)
    TEXT -392 -112 Left 0 ;V(n004)
     
  18. Joerg

    Joerg Guest

    Well, what can I say, it worked. There must have been a change of mind
    among the administrators since the time I asked. Because back then it
    was a firm no from their side.

    There's also a guy (Falk Willberg) on the German NG who set up a server
    that supports binaries. But one must subscribe to that so right now we
    are an "NG of two" over there, Falk and me.

    --
    Gruesse, Joerg

    http://www.analogconsultants.com/

    "gmail" domain blocked because of excessive spam.
    Use another domain or send PM.
     
  19. Joerg

    Joerg Guest

    Or could it be your tools that don't behave?

    On Thunderbird it does show as inline plus as an attached file. To make
    sure, I then downloaded it into a temp directory (not the one from where
    I attached it) and opened it in LTSpice. Woiks. Then I did same with the
    netbook which never had that file. Woiks.
     
  20. Joerg

    Joerg Guest

    Obviously not a very good one. Klaus Butzmann in the German NG read my
    attachment just fine, as a file.

    One guy did, he just said so. It's midnight over there so there won't be
    many answering in the next few hours.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Electronics Point Logo
Continue to site
Quote of the day

-