Analysis and Simulation of Active Filters Using Operational Transconductance Amplifier (OTA)

Abstract

As the transistors are continuously scaling down, it becomes necessary to reduce voltage supply and power requirements of the circuit to increase its performance and stability. Whereas, current-mode devices require less number of stages with high output impedance results in improved performance and large bandwidth as compared to voltage-mode techniques. OTA are current-mode device that takes voltage as input and produces current as output with high gain and large bandwidth. The frequency bands were parameters were determined such as the cutoff frequency (fc), the band width (BW), the quality factor (Q), and the angular frequency (Wo). In this paper the design and the simulation of the transfer function has been done by using (MATLAB) in order to obtain the frequency response for all types of filter (the low pass filter, high pass filter, band pass filter and band stop filter). Keyword: Bw, Matlab, Ota OTA modelThese filters consist of operational transconductance amplifier and capacitor only. OTA is voltage control current source with transfer circuits. The symbol and small-signal equivalent circuit is shown in Figure (

Extended Bandwidth Method on Symmetrical Operational Transconductance Amplifier and Filter Application

“…Operational transconductance amplifiers (OTA) are significant active elements for continuous-time signal processing applications. In the literature, many OTA based circuit blocks such as filters [1][2][3][4][5][6], oscillators [7][8][9], mem-elements [10][11] and inductance simulators [12][13][14] etc. have been reported.…”