| 摘要 |
PURPOSE:To obtain an output signal in phase with an input, by connecting a capacitor to a switched capacitor connected to the 1st and 2nd stage integrators in parallel and applying an input signal to the 2nd stage integrator directly. CONSTITUTION:A capacitor K3C is connected in parallel with a switched capacitor K0C to an operational amplifier OP constituting the 1st stage integrator to pass through an input signal V1. A capacitor K6C connected in parallel with a switched capacitor K2C and a switched capacitor K5C to directly apply the inut signal V1 are connected to the input of an operational amplifier OP2 constituting the 2nd stage integrator. Taking alpha0=K0/T, alpha2=K2/T, alpha3=K3, alpha5=K5/T, and alpha6=K6, where T is the sampling period of a switched capacitor, when each capacitance is selected so that alpha5=alpha2alpha3+alpha0alpha6, the polarity of the input signal V1 and an output signal V2 is in phase. |
