Electronics > Projects, Designs, and Technical Stuff
Sine to square wave with same frequency
rs20:
--- Quote from: dom0 on November 07, 2015, 10:45:06 am ---
--- Quote from: rs20 on November 07, 2015, 08:20:13 am ---
--- Quote from: mark03 on November 06, 2015, 05:51:05 pm ---Some oscillator mfgs suggest a circuit like this:
http://www.pletronics.com/ple/articles/view/401
using a feedback resistor around a logic gate. Is that equivalent to a Schmitt trigger input?
--- End quote ---
No, that's a negative feedback resistor. Schmitt trigger makes use of positive feedback.
--- End quote ---
It's no feedback at all at the working frequency. The 1 M? bias the gate.
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...via negative feedback at DC ;D
bloguetronica:
--- Quote from: ocw on November 06, 2015, 03:23:20 pm ---To see a translated version of Samuel Lawrence's sine to square wave converter go to:
https://translate.google.com/translate?hl=en&sl=pt&u=http://www.bloguetronica.com/2015/09/modulo-condicionador-de-sinal-sincronos.html&prev=search
It uses a TLV3501 as a comparator. He found that his circuit worked up to 80 MHz. I've built something similar which has worked up to 20 MHz. I haven't tested my circuit above that frequency yet.
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Appreciated. Thanks!
Kind regards, Samuel Lourenço
TheUnnamedNewbie:
Other way it can be done (I have seen this done at high frequencies) is simply have very, very fast amplifiers, and put many of them in series. As the signal get bigger and bigger you will hit the rails and approach clipping.
But in this case: Schmitt trigger is probably the best approach.
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