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Amplify AWG signal

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Amplify AWG signal

Postby Karl Fischer » Wed Jun 07, 2017 7:53 pm

I recently bought the 2205A scope. It works fine but I bumped into a limitation of the AWG. The output voltage range is ±2V. For my application i need a square wave of a least ±50V. Can you recommend additional hardware or suggest electronic circuits how to amplify the square signal from the AWG?
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Re: Amplify AWG signal

Postby bennog » Fri Jun 09, 2017 6:13 am

If the frequency stay below 20kHz then you can use a regular audio amplifier.
If you want even higher voltages you can use a tube audio amplifier :D

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Re: Amplify AWG signal

Postby Karl Fischer » Sat Jun 10, 2017 1:26 pm

Thank you bennog for your reply.

I tried your suggestion with a standard audio amplifier to see how it would perform. It did not do well. Even at low frequencies (<1kHz) the square waves lose their sharp edges and become distorted sine waves. Tube amplifiers might be more suitable but the cost and that they are not "success garanteed" made me decide to look for other alternatives first.

I came across the possibility of using MOSFETS to switch DC voltages to square waves. Is it possible to use the AWG to trigger the MOSFETS? Could you (or someone else) help me with the circuitry? I don't want to blow up my AWG.
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Re: Amplify AWG signal

Postby bennog » Sun Jun 11, 2017 8:10 am

Be aware that a square wave of 1 kHz has higher harmonics running into several hundreds of kHz even MHz.
So that is why you lose the flanks on a audio amplifier.
I you want to make a square wave of 60V or something then i would suggest using mossfets.

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Re: Amplify AWG signal

Postby bennog » Sun Jun 11, 2017 4:14 pm

Do you only want to use it for square waves, e.g. on off ?
If so it will make things a lot easier.

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Re: Amplify AWG signal

Postby Karl Fischer » Sun Jun 11, 2017 6:32 pm

Yes, only for square waves: -on off +on. (Voltage set by DC-PSU) Let's keep it as simple as possible.
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Re: Amplify AWG signal

Postby Karl Fischer » Thu Jun 22, 2017 8:15 pm

After some online research I found that I need a MOSFET+driver but the circuitry is still unclear. I might skip de AWG and use an Arduino + two MOSFET driver modules. I will have to write the code for the waveforms but it's a lot cheaper than amplifying the AWG: flcelectronics.com/a600.html ($5.000+)
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