In the switched-capacitor CMFB scheme in Fig. 12.21, C₁= 0.1 pF and C₂= 0.5 pF.

(a) With V_CSBIAS = ˆ’1 V, V_OC = V_CM = 0.5 V. If V_CSBIAS changes to ˆ’1.1 V, what is the new value of V_OC? Assume |a_cmc| >> 1.

(b) Ignoring all capacitors except C₁ and C₂, what are the CM and DM output load capacitors when the Ï•₁ switches are on and the Ï•₂ switches are off?

(c) Repeat (b) when the Ï•₂ switches are on and the Ï•₁ switches are off.

Fig. 12.21:

Transcribed Image Text:

$2 VCM S, SA acme'cme $2 Axis of V. VCSBIAS symmetry S2 S5 acme'e cme 02 VCM S3 Vo2