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I deleted the opamp from the circuit already, I forgot to delete .include OPA2604.

Alan, Where is OPA2604.txt? Regards, Andy

Hi, Andy: Thank you for the replies, I understand what's the differences when using '.STEP' & '.subckt', I think that's because 'AKO' not supported in .subckt. And the subckt in (onsemi)'s lib is

Hi I just uploaded my files into the Temp folder. I ran the simulation of the loopgain and phase, I got less than 0dB loopgain, that's not right. I plot Out1/b to get the loopgain and phase, it's not

I agree it's not the best choice, but it does work. Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Hello John, The 741 is too slow. I would use an opamp with at least 10MHz GBW. Best regards, Helmut ---In LTspice@..., <jmw@...> wrote : I agree; even a 741 would do for small

I agree; even a 741 would do for small signals! Best wishes John Woodgate OOO-Own Opinions Only J M Woodgate and Associates www.woodjohn.uk Rayleigh, Essex UK

Hello John, Sorry, you are correct. The cut-off frequency is 38kHz. It's still a frequency where one can find much better suitable opamps. Best regards, Helmut ---In LTspice@...,

That's odd. I get the -3 dB frequency as 38 kHz. The point about the resistor values is quite subtle, as it doesn't apply to most common op-amps, and the data sheet doesn't draw attention to it. Best

Hello Jan, Your circuit finds the operating point aftre a long time in the pseudo transient analysis. You can automatically skip the other methods. See below. .options noopiter gminsteps=0 srcsteps=0

Hello Jan, Balance the opamp input resistances by inserting 10k in series with the inverting input of the first opamp and 15k in series with the inverting input of the second opamp. This makes the

It's not about convergence really; LTspice cannot find the DC operating point easily.? If you add the Spice directive .option gminsteps=0, the simulation runs and gives credible results for the AC

Jan wrote: "I'm trying to simulate a Sallen Key filter with a cutoff frequency of around 40kHz using a unipolar 5V source (See TEMP section). The initial operating point solution does not converge. I

Jan wrote, "The initial operating point solution does not converge. " Actually, it does. But the Gmin Stepping algorithm has trouble, and either runs a very long time or never finishes. We see this

I’m talking about nothing else than having them open in the window of one and the same LTspice application. But I now see that I have to 1. Select Duplicate (F6) 2. Frame the area to be selected. 3.

Hello there group members, I'm trying to simulate a Sallen Key filter with a cutoff frequency of around 40kHz using a unipolar 5V source (See TEMP section). The initial operating point solution does

In order to copy a schematic or part of one to another schematic, you have to have both schematics open in the same instance of LTspice. Open them both before you try to copy. Best wishes John

I thought it would work to select/duplicate a portion of a schematic and drag it into a new window? But for the moment I can't find the protocol how to perform this. With a copied circuit hanging on

Thanks, nice trick. — Christoph

I name all nodes that might be "interesting" so I know where everything is. Donald. -- *Plain Text* email -- it's an accessibility issue () no proprietary attachments; no html mail /&#92;