Clapp Oscillator 200KHz

195

04:34:59

A Clapp oscillator with a resonant frequency of about 200KHz. Add noise to the circuit (Shake phone for mobile devices) and wait for the output to stabilize. 

published 8 years ago

calvin21

8 years ago

Note: The output will attenuate over time as it is not an active oscillator (using an opamp)

hurz

8 years ago

Here what I think you are looking for http://everycircuit.com/circuit/5660510333960192

calvin21

8 years ago

Yeah that's much better. I'll try designing a proper Clapp oscillator spanning +- 5V at some point.

hurz

8 years ago

The only difference to an clapp oscillator is the missing cap in series to the coil. But thats not a big issue, just take it into account for the resonance calculation and it does work. Actually colpitts and clapp are identical for the core circuit.

hurz

8 years ago

Here a Clapp configuration http://everycircuit.com/circuit/6713401702350848

calvin21

8 years ago

@hurz Nice! Really stable output on that Clapp osc of yours. You wouldn't maybe have any recommendations for using an opamp config for the Clapp osc? Preferably one that would output a sine wave that nears V_CC and V_EE without saturation?

hurz

8 years ago

And why these preconditions OpAmp Sin rail2rail?

hurz

8 years ago

Ahh, I forgot, and Clapp?

calvin21

8 years ago

It's part of a project I have to do. The requirements are: a pure sinusoidal output, voltage swing very close to the supply rails without saturation, a resonant frequency of 98KHz with very small margin of error. From what i understand clapp provides the most stable freq output, where the others tend to deviate a bit which is a problem due to the very high accuracy requires. I'll also add a BPF at the output of the practical circuit that I need to build. Any ideas?

hurz

8 years ago

First requirement is already impossible with any harmonic oscillator! Distortion can only be reduced, however distortion is needed to keep it running. So a pure sinwave is impossible!

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