Active RC Applications of the Operational Transresistance Amplifier

Abstract

This paper presents several new active RC circuits employing the Operational Transresistance Amplifier (OTRA) as the active element. Applications of the OTRA in realizing a differential voltage amplifier, a differential integrator, continuous time filters and a quadrature oscillator are presented. The effectiveness of the proposed circuits is demonstrated using PSpice simulations. ÜbersichtDie Arbeit stellt einige neue aktive RC-Schaltungen vor, in denen Operationsverstärker mit stromgesteuerten Spannungsquellen (OTRA) als aktive Elemente zum Ensatz kommen. Anwendungen des OTRA als differentieller Spannungsverstärker, differentieller Integrator, biquadratische Filer und Quadratur-Oszillator werden gezeigt. Der Nutzen der vorgeschlagenen Schaltungen wird mit PSpice-Simulationen nachgewiesen.Für die Dokumentation Operationsverstärker als stromgesteuerte Spannungsquellen / aktive Schaltungen Frequenz 54(2000) 7-8 Brought to you by | University of Arizona Authenticated Download Date | 5/27/15 2:33 AM

Voltage mode third order quadrature oscillators using OTRAs

“…1(a), which is a high gain current input voltage output device. The terminal characteristics of an OTRA is expressed in (1).…”

“…Several methods of designing of both second order and third order quadrature sinusoidal oscillators are available in the literature . The second order quadrature oscillators (SOQOs) implementation using the active RC circuits employing OTRAs [1], a cascade of two all pass filter circuits employing OTRAs [2,3], cascode of an all pass filter circuit along with a non-inverting integrator circuit in a closed loop employing DVCC [4] and low pass filter and an integrator in closed loop employing CDBA [5] are quite popular. A lot of studies have been carried out on SOQOs till date, however more recently few third order quadrature oscillators (TOQOs) have emerged.…”

New CMOS operational transresistance amplifier

“…Two different realizations of the TT biquad are shown in Fig. 4 [4]. The other two realizations can be derived by connecting the input resistance, R 4 , to the positive terminal of the first OTRA leading to the inversion of polarities of both the bandpass and lowpass responses.…”

A 5th order video band elliptic filter topology using OTRA based Fleischer Tow Biquad with MOS-C Realization

“…Several voltage mode filters that use an active element rather than operational amplifier have been developed (Horng et al, 1997;Liu and Lee, 1996;Salama and Soliman, 2000;Liu et al, 1993;Liu and Tsao, 1991) to 1 * Corresponding Author :Ahmet Gökçen, email: ahmetgkcn@gmail.com Volume 1, No. 2, 44-52, 2016 overcome well-known op-amp limitations such as constant gain-bandwidth product, low slew rate, etc.…”