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[Help] About the simulation of Wien-bridge OSC.

xxgenerall

The Wien-bridge OSC is as below.

R=1K Ohms, C=1uF, so f=1/(2*pi*R*C)=159Hz. And the BW of the operational amplifier is 9KHz. Theoretically, the OSC outputs a sine wave.

However, the OSC keeps a common voltage, which is another steady state.

Is there something wrong with my simulation setup? Can you help me, please? Thanks a lot.

Parents

  • I created a circuit similar to use (using opamp from ahdlLib), with the key point that I stepped the supply from 0 to 3.3 near the beginning of time to give the circuit a "kick". I also arranged that the vcom node is half the supply by using a vcvs.

    Without this, the circuit settled to a metastable state and wouldn't oscillate (that's what it looks like is happening for you).

    Here's the output waveform:

     

Reply

  • I created a circuit similar to use (using opamp from ahdlLib), with the key point that I stepped the supply from 0 to 3.3 near the beginning of time to give the circuit a "kick". I also arranged that the vcom node is half the supply by using a vcvs.

    Without this, the circuit settled to a metastable state and wouldn't oscillate (that's what it looks like is happening for you).

    Here's the output waveform:

     

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