0
1.6kviews
Find the steady-state variance of the noise in the output due to quantization of input for the first order filter y(n)=ay(n-1)+x(n).
1 Answer
1
227views

Solution:

 Given y(n)=ay(n1)+x(n)Y(z)=az1Y(z)+X(z)Y(z)az1Y(z)=X(z)Y(z)[1az1]=X(z)H(z)=Y(z)X(z)=11az1=zzaH(z1)=z1z1a

σ2ε=σ2e12πjCA(z)H(z1)z1dz=σ2e12πjczzaz1z1az1dz=σ2e12πjcz1(za)(z1a)dz

σ2ε=σ2e[ residue of z1(za)(z1a) at =σ2e[(za)z1(za)(z1a)]|z=a=σ2e[1/a(1/aa)]=σ2e[11a2]

Please log in to add an answer.