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I want to amplify a rectangular signal coming from a microcontroller.

It goes from -3.3V to 3.3V and has frequency of 2kHz. It is modulated with a trapezoid signal, which means the modulating signal rises up linearly to +/- 3.3V, stays at +/- 3.3V and then falls again to +/- 0V. The rectangular signal oscillates in between.

The maximum output should be as high as 40V and 150mA. Is there an affordable "surface mount" solution?

I was thinking about an op-amp but there are none available which are capable of the power and just cost a few bucks each.

Here is a photo of the signal (the shape of the trapezoid signal is just drawn to make it more clear that the rectangular signal oscillates inside the shape):

enter image description here

JRE
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DOtr
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  • Draw a picture of input and output waveforms and note that requests for product recommendations are off-topic. – Andy aka Nov 02 '22 at 10:18
  • Just how "rectangular" do you need the output to be (rise/fall times)? – TooTea Nov 02 '22 at 10:28
  • It should stay below 20u for each rise and fall time and frequencies up to 100kHz should be amplified well. So pretty rectangular i guess (: – DOtr Nov 02 '22 at 10:54
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    This would be easier: https://i.stack.imgur.com/qJpDe.png ...... is the envelope signal phase-linked to the square carrier wave? – Andy aka Nov 02 '22 at 10:55
  • If it is feasible I will take it. Yes they are phase-linked. – DOtr Nov 02 '22 at 11:38
  • Could you not directly use the microcontroller to generate the desired waveform? Sounds like a PWM problem to me, assuming you have a sufficiently fast PWM unit (you probably do!). Or, you could directly control a cheap DAC (or the DAC of your microcontroller, if it has one), since 2 kHz is rather benign. – Marcus Müller Nov 02 '22 at 16:09
  • The signal is created by the microcontroller. It is just about amplyfing it to 40V and 150mA. Does anybody have an idea how to make this in a smart way? – DOtr Nov 03 '22 at 07:47

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