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| Created | January 27, 2014 |
| Last modified | January 31, 2014 |
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Seems like a very "dirty" sine generator (a slew-rate and saturated first opamp, then ran through a low-pass filter). I'd recommend you search for wien-bridge like oscillators which use a nonlinear element to tune the amplitude. |
January 28, 2014 |
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Thank you for your input! This is just a design I followed from a TI document on a simple sinewave generator. I just wanted to see how well it works. I am trying to go for a clean +/-2.5V 200kHz sine wave so I will look into that wien-bridge style. |
January 30, 2014 |
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Try this: https://www.circuitlab.com/circuit/5v7gqy/wienbridgewithdiodes/ and play with the values of the capacitors and resistors in the positive feedback loop (note that the two R's and the two C's should be the same value). The diodes and resistors on the other loop try to keep the amplitude more or less constant. A better solution uses a lamp, but CL does not have that model. |
January 30, 2014 |
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