| 摘要 |
PURPOSE:To obtain an optional filter characteristic easily by an external resistance or capacitor, by connecting a voltage dividing means to a capacitor for samping a signal charge to apply a divided voltage. CONSTITUTION:A phase inverting integrator consists of resistances R1 and R2, switches S1a and S1b, a sampling capacitor CA1, an integrating capacitor CB1, and an operational amplifier OPA1. A voltage divided by resistances R1 and R2 is applied to the capacitor CA1. In this case, the resistance R2 is external, and the coefficient is set by selecting R1/R2. The external resistance R2 is made high by making the resistance R1 high not only to facilitate adjustment but also to reduce the loss. |
