Electronics > Beginners
looking for a sine wave output device
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LaserTazerPhaser:
Is there a device which can output very low frequencies to =>1Mhz few amps =>12v sine?

Perhaps a wideband pure sine wave inverter but currently those only are specked  for residential frequencies only. I was considering a low ESL large DC link cap for decoupling a linear MOSFET which would output the desired frequency or is there a more efficient method to this?
LaserTazerPhaser:
Is there some circuit for an application with this already implemented? The linear MOSFET method.
ogden:

--- Quote from: blueskull on May 27, 2019, 04:48:08 am ---Unless you are a God of control loop designing, usually you need 10x corner frequency than reference bandwidth, and 10x switching frequency than corner frequency, so to have 1MHz reference, your switching frequency needs to be 100MHz, if you are after a class D.

--- End quote ---

In case you are fine with fixed amplitude and frequency, all components of classic class-d amplifier are not needed. What you need is - precomputed 1-bit DAC bitstream that would come out of class-d modulator which is fed into power (PWM) stage followed by LC filter. I'v done that with great success generating 10KHz sine out of microcontroller that does not have DAC but spare SPI to output 1-bit DAC bitstream. For 1MHz sine it could be doable with 24MSPS in case of steep LC filter (5-th order or 7-th).
garethw:
From my limited experience with sinusoidal waveforms they are tricky enough to get right over a small frequency range, let alone the range you specified. It can be done, I’m sure, but with a substantial amount of effort and know how.


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Dabbot:
Every modern household has at least half a dozen sine wave output devices.  >:D
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