A Novel Approach for Realization of Higher Order Filter using Bipolar and MOS Current-Mirrors

Abstract

In this paper, we have presented an approach to realize higher order current-mode filters using cascade technique of lower order filters realized using CMOS current-mirrors. This paper presents the realization of higher-order low-pass (LP) active current-mode filters using cascade technique of second and third order filters. Interest in current-mode (CM) filters has been growing due to the fact that current-mode devices have wider dynamic range, improved linearity, and extended bandwidth as compared to their voltage- mode counterparts. In the sub-micron era of semi-conductor technology, the minute structure of devices causes a high electric field and thus the power supply voltage is limited to a certain low value to protect the device from destruction. Current-mode signal processing is quite attractive for operation at high frequencies and low power supply voltage operation from the viewpoint of sub-micron era. The realized filters do not contain any resistors, therefore simplifying the pattern of integrated circuits and thus reducing the chip area and the cost. The proposed circuits presented in the paper using bipolar technology and CMOS technology were tested in SPICE using BJT model NR100N and PR100N and the MOS structure using 0.5µm CMOS process parameters provided by MOSIS (AGILENT) and the results thus obtained were in accordance with the theoretical values.