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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@..., wrote :

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 wishes
John Woodgate OOO-Own Opinions Only
J M Woodgate and Associates 
Rayleigh, Essex UK

On 2018-12-02 17:28, helmutsennewald@... [LTspice] wrote:

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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

This opamp is for resistors with a resistance below 1kOhm at it's input due to its maximum bias current of 10uA. It's the wrong opamp for your application of a lowpass filter with 10kHz cut-off frequency.

Best regards,

Helmut