compenstation cap for 2nd order allpass delay circuit

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Henry8

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Joined 2010
#1
2 questions regarding this circuit.
Does it need a stabilitly cap to stop hf oscillations?
How is the input impedance calculated?
 

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#2
It needs a cap only across the feedback resistor of the second OPA. With the aid of a square wave generator (at 10KHz) and a scope connected in output,try values between 22pF to 220pF to find where the overshoot of square is eliminated.
For the input impedance calculation, you may ask the help of AndrewT.
 
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