PARASITIC CAPACITANCE INSENSITIVE TECHNIQUE FOR CAPACITOR ARRAY SPLIT CIRCUIT

摘要

A parasitic capacitance insensitive technique for a capacitor array split circuit is provided to maintain the fixed voltage in the parasitic capacitance by setting up the charge-control part in the off switch. A complementation switched capacitor combination(30) comprises az complementary switch(31) and a capacitor(32). The complementary switch is made of an on-switch(31-1) and an off-switch(31-2). The capacitor receives the predetermined electric potential according to the on/off of the complementary switch. A charge-control part(10) is formed with the operational amplifier. The output terminal of the operational amplifier is connected to the inverted input terminal. The complementation switched capacitor combination is serially connected to the charge-control part. The complementary switch is serially connected to the capacitor. One side plate of capacitor is connected to the C+ terminal. The other side plate of capacitor is connected to one node of the complementary switch. On switch of the complementary switch is connected to the C- terminal. The off switch of the complementary switch is connected to I node.