PURPOSE: To constitute each filter through the use of OTA elements and capacitors. ;CONSTITUTION: The filter is made up of an OTA element 1 whose noninverting input terminal receives a signal, an OTA element 2 receiving its output at its inverting input and subjected to negative feedback, an OTA element 3 whose output terminal connects to a capacitor C1, forming an integration device and receiving an output of the OTA element 3 at its noninverting input, an OTA element 4 whose output terminal connects to a capacitor C2 to form an integration device and using an output of the OTA element 3 as its noninverting input, an OTA element 5 using an output of the OTA element 3 for its inverting input and whose output connects to an output of the OTA element 1, an OTA element 6 using an output of the OTA element 4 as its inverting input and whose output connects to the output terminal of the OTA element l, an OTA element 7 whose input terminal connects to the output terminal of each OTA element properly, and an OTA element 8 using an output of the OTA element 7 as an inverting input and subjected to negative feedback. An LPF, an HPF, a BPF, a BEF and an APF or the like are formed by using the OTA elements 1-8 and capacitors C1, C2.;COPYRIGHT: (C)1994,JPO&Japio
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