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CT sigma delta 2nd order

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satyanitt

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hi all
im doing my proj sig del CT
fs=6.144Mhz
signal bandwidth is 24000 Hz
order 2
Nrz pulse feedback 1 bit quantizer

im implemnting ota in 180 nm tech
vdd=1.8
vss=0
i designed the ota for input common mode at 0.9v
wat shud be the input given for the modulator.
A sin wave with .9 dc and some ac on it ?
0r
A sinwave wid .8 amplitude sine wave?
plz help me out
 

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