Filter circuit utilizing charge transfer device

A filter circuit comprising:

• a charge transfer device;
• clock signal drive circuit means including means for supplying a clock signal to said charge transfer device;
• said charge transfer device including a plurality of successive capacitive storage means for sequentially holding a charge level representing a time sampled input signal, each of said capacitive storage means having a first clocking electrode for receiving said clock signal so that said charge level is transferred from one to another of said capacitive storage means in succession in response to said clock signal;
• a predetermined plurality of said plurality of capacitive storage means each including respective first and second capacitive portions, said respective first and second capacitive portions being connected in parallel with each other for said transfer from the respective capacitive storage means to another of said capacitive storage means, said respective first and second capacitive portions having a selected capacitive ratio;
• each of said first capacitive portions having a respective one of said first clocking electrodes for receiving said clock signal, and said second capacitive portions having respective second clocking electrodes;
• a first connection point connected to a predetermined number of said second clocking electrodes;
• a second connection point connected to a remaining number of said second clocking electrodes;
• said clock signal drive circuit means further including first and second clock driver circuits operated in synchronism with said clock signal and connected to said first and second connection points, respectively;
• current detecting means for detecting currents flowing through said first and second clock driver circuits, respectively, and
• output means for compounding the detected currents and deriving an output signal.