| 摘要 |
PURPOSE:To decrease number of transversal filter circuits by connecting a series circuit each comprising a switch and a capacitor, a switched capacitor circuit, a weighting circuit and a product sum circuit between the input and output terminals of the 1st operational amplifier. CONSTITUTION:Switches 11, 12 are switched by each clock. An input signal is stored sequentially in capacitors CM1-CM4. In this case, signals x(n-1)-x(n-3) are stored respectively in the capacitors. The input signal x(n) is stored in the capacitor CM1 and inputted to a product sum circuit section, where a factor of C2/CA is multiplied and stored in a capacitor CA. Then the input signal is outputted sequentially from the capacitors CM4, CM3 and processed similarly. Then the input signal x(n+1) is incoming to the input and stored in the capacitor CM2 and inputted to the product sum circuit section. Then the signal x(n) x(n-1) x(n-2) is outputted in the order of CM1 CM4 CM3 and the product sum is obtained by the capacitor CA.
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