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Help! (digital sigma Delta DAC in Cadence)

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nishagajare

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Hello all!!! I have designed digital sigma Delta DAC in Cadence. At the output designing analog sallen and key low pass filter but problem to recover the signal.i need to change the desinged components value to match with signal.
Still not getting properly. Could you please tell me what exactly the problem with my filter
 

danadakk

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Post a schematic and design goals of the filter so forum can help you.

Regards, Dana.
 

nishagajare

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Thank you so much for response
Input signal frequency 23 khz
Osr value of 10
Bw is 1.6Mhz
Expected to recover input signal with same bandwidth
schematicinpit bits are 8 bits and Output is one bit digital pwm signal applied to one bit dac then sallen and key low pass filter 4 th order but not getting proper signal recovered but if I try to change components value is going to match with input signal , not getting logic
Here I attached the schematic
 

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