connected from the first main electrode of transistor q59 to ground the non inverting terminal of operational amplifier 151 is grounded and the output of operational amplifier 151 is fed back via capacitor c1 to its negative input terminal this structure so far described is representative of the typical switched capacitor function the output of operational amplifier 151 is applied to one main electrode of transistor q53 which is gated by phase 3 to a second main electrode capacitor k5c2 is connected in series with the second main electrode of transistor q53 and to a first main electrode of transistor q56 which is gated by phase 4 the second main electrode of transistor q56 is connected to the inverting input of operational amplifier 152 and is also connected by way of capacitor k4c2 to the first main electrode of transistor q50 transistor q54 gated by phase 4 is connected from the second main electrode of transistor q53 to ground transistor q55 gated by phase 3 is connected from the first main electrode of transistor q56 to ground the non inverting terminal of operational amplifier 152 is grounded and its output is fed back via capacitor c2 to its inverting input the output of operational amplifier 152 is also connected through the first main electrode of transistor q57 which is gated by phase 4 to its second main electrode which is connected to one terminal of capacitor k2c1 and one terminal of capacitor k6c2 the.