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Re: Singular matrix
开云体育On 25/03/2025 19:07, pilou via
groups.io wrote:
Sorry. Yes, you're right. -- Regards, Tony |
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Re: LTspice non-inverting Opamp loop gain.
开云体育Hi, Victor. Perhaps I should say 'Salve,
Victor'! I think you need to explain a bit more about your
question. What is it about the Tian method that you need more
information on? In the first place, with no external input, the
opamp doesn't 'know' whether it is inverting or non-inverting;
that is just a matter of how the external signal is fed in. In
the inverting case, it is fed through a resistor, but in the
non-inverting case, that resistor is between the inverting input
and ground, while the external input is applied, either via a resistor or directly, to the non-inverting input of the opamp, which may
have near-infinite internal impedance or a value defined in the
data sheet. On 2025-03-25 21:46, LV via groups.io
wrote:
--
OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion |
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Re: LTspice non-inverting Opamp loop gain.
开云体育*Actually*, Dave (me) is not a purist about this side topic! I expected one of the real purists to chime in before this. ? I pointed Victor towards a tutorial on the subject he was asking about. ? Dave From: [email protected] <[email protected]>
On Behalf Of John Woodgate
Sent: Tuesday, March 25, 2025 2:28 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice] LTspice non-inverting Opamp loop gain. ? Dave is a wee bit purist on what is on-topic. The list has very many members , so we can expect differences of opinion, and accept them. On 2025-03-25 21:15, BRUCE108 wrote:
-- ?
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Re: LTspice non-inverting Opamp loop gain.
开云体育Dave is a wee bit purist on what is on-topic.
The list has very many members , so we can expect differences of
opinion, and accept them. On 2025-03-25 21:15, BRUCE108 wrote:
--
OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion |
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Re: LTspice non-inverting Opamp loop gain.
开云体育You will soon be told this forum is for LTspice-specific questions, not for electronic design.? :{) But I would suggest: ?
? Dave ? From: [email protected] <[email protected]>
On Behalf Of LV via groups.io
Sent: Tuesday, March 25, 2025 1:34 PM To: [email protected] Subject: EXTERNAL: [LTspice] LTspice non-inverting Opamp loop gain. ? Hello, ? There is example for open loop gain simulation for inverting Opamp: C:\Users\...\AppData\Local\LTspice\examples\Educational\LoopGain2.asc ? How to modify probes circuit and connection for Non-inverting Opamp? Especially how I should connect non-inverting input? -- Kind regards, |
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Re: Singular matrix
开云体育On 25/03/2025 17:40, pilou via
groups.io wrote:
Are you sure? U2 and J2 are correct? U2 is configured as an inverting amplifier and is connected to node OUT, which must always be positive. Therefore, U2's output should go negative, but it can't because it doesn't have a negative power rail, it is grounded. Did you test each stage before connecting it all together? --
Regards, Tony |
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Re: Singular matrix
开云体育On 25/03/2025 17:40, pilou via
groups.io wrote:
This circuit runs in 24.1.4, but fails in 24.0.12 with a singular matrix error. Note: there is a pin (A1) on the thermistor, U7, that is disconnected - it's in the body of the symbol. Perhaps it needs connecting to something. -- Regards, Tony |
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Re: Singular matrix
开云体育You didn't fix the path in RQ3E100AT_TH, but
never mind. I can't see what is causing the singular matrix
error. On 2025-03-25 16:40, pilou via
groups.io wrote:
--
OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion |
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Re: .STEPping a .WAVE file output
开云体育D’oh!? Further breaking a broken interface… ? From: [email protected] <[email protected]>
On Behalf Of ericsson.sunshine via groups.io
Sent: Monday, March 24, 2025 6:48 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice] .STEPping a .WAVE file output ? On Tue, Mar 25, 2025 at 09:27 AM, <ericsson.sunshine@...> wrote:
Oops, I found the ".step + ,wave" method only works in LTspice XVII, not supported in LTspice V24.1.5.
In V24.1.5 I , it only creates a file named "{stp}". ? Best reards. |
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Re: .STEPping a .WAVE file output
开云体育Very nice! I used to have a good mass rename/redate tool for Windows, but it’s been a while. ? Thak you! Dave ? From: [email protected] <[email protected]>
On Behalf Of ericsson.sunshine via groups.io
Sent: Monday, March 24, 2025 6:27 PM To: [email protected] Subject: EXTERNAL: Re: [LTspice] .STEPping a .WAVE file output ? Hi, : ? I have tested the following methods, plus the *.bat running under Windows OS. ? " .step param stp 1 6 1 " --> it generates the file 1, 2,...,6 ? Then run the batch file, as following: (save it to file & name it to ***.bat) " @echo off " ? Not sure if that's my naive, I tried the website of Analog Device, it doesn't release LTspice 24.1.6 yet.
? Have a nice day. Best regards. |
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Re: Singular matrix
开云体育We can't run it , because:
On 2025-03-25 13:18, pilou via
groups.io wrote:
--
OOO - Own Opinions only If something is true: * as far as we know - it's science *for certain - it's mathematics *unquestionably - it's religion |
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Tony Casey
DerekK
John Woodgate
LV
Bell, Dave