Hello,
I try to run a UAF42 sim. It is ultraslow.(days) in nS of even pSec/sec..
I added the .mod file with a .txt extension and the .asy.
It should produce a sine wave of 620Khz...
Any idea.. Thanks for an advise

 

Remove the (-) sign in front of the V2 voltage.
That sign means there is a positive 15V at the bottom (-) output of V2 and you want a negative output.

If you want to leave the minus sign, then you need to invert V2.

 

Hi

Set V2 to 15v because you already have it connected as a negative power source.

Set AC amplitude to 1v (AC 1), then use AC analysis to plot frequency response.

eT

 

Remove the (-) sign in front of the V2 voltage.
That sign means there is a positive 15V at the bottom (-) output of V2 and you want a negative output.

If you want to leave the minus sign, then you need to invert V2.

Thanks !! was first time with dual supply. After correction I see the UAF42 doesn't create the expected sine wave as described in http://www.ti.com/lit/an/sbfa003/sbfa003.pdf. It remains at 15V. I must have missed something?

 

Works okay for me.
But you seem to have slipped a few orders of magnitude in your calculations.
Those values are for a 620Hz filter, not a 620kHz filter.

 

Works okay for me.
But you seem to have slipped a few orders of magnitude in your calculations.
Those values are for a 620Hz filter, not a 620kHz filter.

View attachment 151816

Many thanks to both of you!! Is there a formula to calculate the external components for 600Khz which is what I need?

 

Here's a design manual, and here's some info on using the FilterPro program to calculate the values.
But you should read the data sheet (gasp). That device can go to only 100kHz.

 

Here's a design manual, and here's some info on using the FilterPro program to calculate the values.
But you should read the data sheet (gasp). That device can go to only 100kHz.

View attachment 151829

Many thanks again! I need 600Khz. I guess I better open another thread in order to realise a sine generator 600Khz 30V while having a single power supply of 9V... It should also have temp. compensation since it can reach 90°C.

 

Yes you probably should start a new thread.

But if you need a sine-wave oscillator, why not build a sine-wave oscillator instead of trying to convert a square-wave to a sinewave?

 

I prefer to build a direct sinus gen. I 'm looking for one that can achieve the conditions I mentioned in #8. I looked for examples of that on the net but I didn'found one that could make 30V without dual voltage supply and meet temp. compensation conditions. Also sinus amplifiers are almost always dual supply Voltage. How can I realise that on a compact PCB and suited for an environment where temps can reach 90°C.

 

It's difficult to generate 30V from a 9V supply unless you use a step-up transformer.

 

It's difficult to generate 30V from a 9V supply unless you use a step-up transformer.

at 600Khz? What IC's do you advise and which transfo to build for that freq?