Finite Gain Effects in SC Circuits. Gabor C Temes School of EECS Oregon State University Rev. 03/09/ 2013. Non-Idealities of an Op-Amp. DC offset voltage Finite dc gain Finite bandwidth Nonzero output impedance Noise. Model for Finite Gain. Model for Finite-Gain Effect.
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Gabor C Temes
School of EECS
Oregon State University
So, H(z) = -Y1/Y2 when Ao infinity
H(z) = -Y1/(Y2+Y1/Ao+Y2/Ao)
q1(n) = C1[vin(n)-v-(n)]=q2(n)
q2(n)=-C2[vo(n) - v-(n) - vo(n-1)+v-(n-1)]
C1vin(n) = -C2vo(n)+v-(n)[C1+C2]+C2vo[n-1] – C2v-(n-1)
C1vin(n) = -C2[vo(n)-vo(n-1)] - [C1+C2)/A]vo(n)+(C2/A)vo(n-1)
(C1/A)vo(n) error is critical. It causes a phase error near dc
C2(1+1/A)[vo(n)-vo(n-1)] error is negligible.
(C1/A)vo(n) error causes a phase error near dc.
(C1/A)vo error causes phase error near dc.