Issue designing mosfet based rc phase shift oscillator

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ASJAXJAXAJX

Joined Oct 1, 2020
1
Hi everyone, i've to design a mosfet rc phase shift oscillator for 8kHz.

but i can not set exact gain for the circuit (29) for the mosfet amplifier.
done all calculations

otherwise circuit doesn't work.

Here is the circuit

Can anyone plz explain, what's wrong ?
 

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