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help please(20 points) - modulator is unstable in simulink

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arunkumar446

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help please(20 points)

discrete time 2nd order sigma delta modulator is unstable in simulink. any one please help me how to choose gain parameters and in designing. Thanks in advance.
 

Re: help please(20 points)

arunkumar446 said:
discrete time 2nd order sigma delta modulator is unstable in simulink. any one please help me how to choose gain parameters and in designing. Thanks in advance.
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Vin------- + --" a1 "-------| int 1 |-------- + -----" a2 "-------| int 2 |-------------
.............. |..............................................|
.............. |..............................................|
.............. |..............................................|
.............. |.......................................... " b "
.............. |..............................................|
.............. |..............................................|......................| DAC |...............

choose a1=a2=1 ,b=2
or a1=0.5, a2=2, b=1
 

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