| 摘要 |
PURPOSE:To make a D/A conversion output being a product among plural digital input signals from one D/A converter by controlling a switched capacitor provided between an integration circuit and a constant current circuit depending on the level of the 1st and 2nd digital input signals. CONSTITUTION:A constant current from a constant current circuit 21 is converted into a constant voltage by a current-voltage converting means 22 and fed to the integration circuit 26 via the switched capacitor 23. Then the switching of the switched capacitor is controlled by control means 28, 31, 39-46 to which the 1st and 2nd digital input signals are fed. Further, an analog output signal corresponding to the product between the 1st and 2nd digital input signals is extracted at the output side of the integration circuit. Thus, the D/A converter applying D/A conversion to the product of the plural digital input signals is obtained. |
