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Projects, Designs, and Technical Stuff / Re: Accurate sine wave in terms of amplitude
« Last post by PCB.Wiz on Today at 08:25:42 pm »>What is the target distortion ?It seems there is a lot you do not know. The frequency and amplitude are important info, even ballparks ?
I do not know yet.
What is the intended purpose of this signal, you must know at least that ?
eg is it to calibrate meters ?
One option is that: do not care. I can measure what the amplitude is and then do the math one way or another.
Then you need a precision rectifier. Also non trivial, but easier at low frequencies.
You can assist the LPF design, by using a shaped stepped sine generated digitally, using simple CMOS counters/gates and resistors.
Or a small MCU with a DAC, can do most of the work, at lower frequencies. This is why the parameters matter.