Voltage-mode multifunction biquadratic filter with one input and six outputs using two ICCIIs.

Hua-Pin Chen

doi:10.1155/2014/432570

Abstract

A novel voltage-mode multifunction biquadratic filter with one input and six outputs is presented. The proposed circuit can realize inverting and noninverting low-pass, bandpass, and high-pass filters, simultaneously, by using two inverting second-generation current conveyors (ICCIIs), two grounded capacitors, and four resistors. Moreover, the proposed circuit offers the following attractive advantages: no requirements for component matching conditions, the use of only grounded capacitors, and low active and passive sensitivities. HSPICE and MATLAB simulations results are provided to demonstrate the theoretical analysis.

Highlights

There has been an increasing interest in the design of multifunction biquadratic filters
Because the ICCII has a nonnegligible output parasitic resistance on port X (RX), when the X port of ICCII is loaded by a capacitor, it leads to improper transfer functions
Because each X terminal of the ICCII in the proposed circuit of Figure 3 is directly connected to an external resistor, the effect of parasitic resistance RX can be absorbed as a part of the main resistance

Summary

Introduction

There has been an increasing interest in the design of multifunction biquadratic filters. An interesting ICCII-based voltage-mode multifunction biquadratic filter with single input and six outputs employing two grounded capacitors and four resistors is proposed [16] This filter simultaneously realizes inverting and noninverting low-pass, bandpass, and high-pass filtering responses in the same configuration. The two external capacitors are grounded and can absorb the parasitic capacitances at the Z or/and Y terminals of the ICCIIs. To the best of the author’s knowledge, none of the previous voltage-mode multifunction biquadratic filters employing only two active components, are able to realize inverting and noninverting low-pass, bandpass, and high-pass filters simultaneously without imposing component choice except the circuit reported in [16]; this circuit on the other hand and the two capacitors are connected to the X terminals of the ICCII which limits the operating frequency of the circuit [17]

Proposed Circuit

R1R2C1C2

Influence of Parasitic Elements

Simulation Results

Conclusions