15 MHz ELLIPTIC OTA-C FILTERS IN 1.2 μm CMOS TECHNOLOGY

摘要

The paper presents a complete design of two different orders elliptic CMOS continuous time filters with cut-off frequency of 15 MHz. The first realizes 3rd order signal filtering and the second one is a 5th order filter. Both filters are based on linear, fully-balanced, folded cascode operational transconductance amplifier (OTA) with large DC gain and high output resistance. The presented approach exploits transconductance cells connected in a gyrator structure in order to simulate an inductance element in a wide frequency band.