Re: fast NPN in LT Spice

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Sujet : Re: fast NPN in LT Spice
De : legg (at) *nospam* nospam.magma.ca (legg)
Groupes : sci.electronics.design
Date : 11. Jun 2024, 17:27:20
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Organisation : A noiseless patient Spider
Message-ID : <hqqg6jdfj86p3poosm1qdi36e933prvhhg@4ax.com>
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On Wed, 12 Jun 2024 00:35:59 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:

On 11/06/2024 7:27 am, legg wrote:
On Sat, 8 Jun 2024 03:29:11 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
 
On 7/06/2024 11:24 pm, legg wrote:
On Fri, 7 Jun 2024 14:03:16 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
>
On 7/06/2024 4:05 am, legg wrote:
On Thu, 6 Jun 2024 23:18:12 +1000, Bill Sloman <bill.sloman@ieee.org>
wrote:
>
On 6/06/2024 1:46 pm, legg wrote
<snip>
>
 
Right, I see Q2 normally inverted.
 
C2 seems unneccessarily loaded.
>
If you are talking about the .asc file I posted on the 3rd June, Q2
isn't "normally inverted" - its mostly on, and it gets turned off for
the 30nsec in which the stretched pulse is being generated. Inverted
operation of a bipolar transistor is usually taken to mean running
current through them in the opposite direction than is seen in normal
operation.

Just returning to this, trying to see what determines the switch from
non-switching to astable operation (ECLTN0E - ECLTN0D). Misreading a
current and voltage waveform with similar color coding.
>
C2 isn't carrying any current worth worrying about. It stabilises the
voltage at the base of Q3 against the base current drawn when the output
pulse is turned on and turned off, -6.7mA when it is turned on an +2mA
when it is turned off, and holds the voltage excursion down to 3.7mV,
not that I ever bothered working this out.
>
If you want to discuss when the circuit does and how it does it, feel
free, but this wasn't a good start.
>
--
Bill Sloman, Sydney

Not so much interested in the circuit, as its reaction to model
parameters presented by similar devices.

Not Beta, Tr or Tf in this case.

RL

Date Sujet#  Auteur
3 Jun 24 * fast NPN in LT Spice35john larkin
3 Jun 24 +* Re: fast NPN in LT Spice2Cursitor Doom
3 Jun 24 i`- Re: fast NPN in LT Spice1john larkin
3 Jun 24 +* Re: fast NPN in LT Spice28Edward Rawde
3 Jun 24 i`* Re: fast NPN in LT Spice27john larkin
3 Jun 24 i +- Re: fast NPN in LT Spice1Edward Rawde
3 Jun 24 i `* Re: fast NPN in LT Spice25Edward Rawde
3 Jun 24 i  `* Re: fast NPN in LT Spice24john larkin
3 Jun 24 i   +* Re: fast NPN in LT Spice18Bill Sloman
3 Jun 24 i   i`* Re: fast NPN in LT Spice17john larkin
3 Jun 24 i   i `* Re: fast NPN in LT Spice16Bill Sloman
6 Jun 24 i   i  `* Re: fast NPN in LT Spice15legg
6 Jun 24 i   i   +* Re: fast NPN in LT Spice12Bill Sloman
6 Jun 24 i   i   i`* Re: fast NPN in LT Spice11legg
7 Jun 24 i   i   i `* Re: fast NPN in LT Spice10Bill Sloman
7 Jun 24 i   i   i  `* Re: fast NPN in LT Spice9legg
7 Jun 24 i   i   i   `* Re: fast NPN in LT Spice8Bill Sloman
7 Jun 24 i   i   i    +- Re: fast NPN in LT Spice1legg
10 Jun 24 i   i   i    `* Re: fast NPN in LT Spice6legg
11 Jun 24 i   i   i     `* Re: fast NPN in LT Spice5Bill Sloman
11 Jun 24 i   i   i      `* Re: fast NPN in LT Spice4legg
12 Jun 24 i   i   i       `* Re: fast NPN in LT Spice3Bill Sloman
12 Jun 24 i   i   i        `* Re: fast NPN in LT Spice2legg
12 Jun 24 i   i   i         `- Re: fast NPN in LT Spice1Bill Sloman
6 Jun 24 i   i   `* Re: fast NPN in LT Spice2john larkin
6 Jun 24 i   i    `- Re: fast NPN in LT Spice1Bill Sloman
3 Jun 24 i   +* Re: fast NPN in LT Spice4piglet
3 Jun 24 i   i+* Re: fast NPN in LT Spice2john larkin
3 Jun 24 i   ii`- Re: fast NPN in LT Spice1Bill Sloman
3 Jun 24 i   i`- Re: fast NPN in LT Spice1Bill Sloman
3 Jun 24 i   `- Re: fast NPN in LT Spice1legg
3 Jun 24 +* Re: fast NPN in LT Spice3Jeroen Belleman
3 Jun 24 i`* Re: fast NPN in LT Spice2john larkin
3 Jun 24 i `- Re: fast NPN in LT Spice1Bill Sloman
3 Jun 24 `- Re: fast NPN in LT Spice1legg

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