adesign
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Hi,
I'm referring the Figure6.8 on page 413.
Here is the sequence of operation: During phase Φ1, LHP(Left Hand Plate) of C1 is connected to Vs whereas RHP(Right Hand Plate) of C1 is connected to ground. This means the net charge on C1 is C1.Vs during phase Φ1. During this phase only, the capacitor C2 is fully discharged. In this phase, RHP of C1 and LHP of C2 are hard-grounded.
During phase Φ2, switches S1, S3 and S4 opens, whereas switches S2 and S5 closes. The hard-grounding from RHP of C1 and LHP of C2 is removed. Then the virtual-ground functionality of opamp starts, such that this node acquires virtual-ground. During this operation, the charge transfers occurs and this leads to the net voltage on Vo as
Vo = (C1/C2)*Vs
Thanks.
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