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专利名称：SWITCHED CAPACITOR FILTER发明人：KURAISHI YOSHIAKI申请号：JP28307086申请日：19861129公开号：JPS63138810A公开日：19880610
摘要：PURPOSE:To eliminate an error caused due to the wiring capacitance byproviding an operational amplifier connecting an inverted input to the 1st, 2nd and 3rddischarge switches of the 1st, 2nd and 3rd sampling capacitor. CONSTITUTION:An inputsignal v1 fed to a terminal 1 is sampled by a capacitor 8 at a time (n-2)T. The signal issampled in a capacitor 8 at a time (n-3/2)T and sampled in a capacitor 7 at a time (n-1)T.The electric charge in the capacitors 6, 8 at the time (n-1)T is transferred to theintegration capacitor 9 via switches 2, 4 respectively. The signal v1 is sampled in thecapacitor 8 at a time (n-1/2)T and the charge in the capacitors 7, 8 is transferred to theintegration capacitor 9 at a time (nT) via the switches 3, 4 respectively. The charge in afeedback capacitor 10 is transferred to the integration capacitor 9 at times (n-1)T and nT.The operational amplifier 11 applies integration and an output signal v2 is generated atan output terminal 12.
申请人：NEC CORP
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