Four new oscillators using operational transresistance amplifier

Pittala, Chandra Shaker; Srinivasulu, Avireni

doi:10.3103/s0735272717050028

Cited by 7 publications

(2 citation statements)

References 27 publications

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“…Recently, an active current-mode device, called an operational transresistance amplifier (OTRA), has come to limelight with the introduction of several high performances CMOS OTRA realizations. Several waveform generators using an operational transresistance amplifier (OTRA) were reported earlier in the literature [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42]. Square-waveform generator using single OTRA and a few passive components was proposed in [28].…”

Section: Introductionmentioning

confidence: 99%

Electronic Tuning Square-Wave Generators with Improved Linearity Using Operational Transresistance Amplifier

Pittala¹,

Srinivasulu

2020

JLPEA

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Two new electronic tuning current-mode square-wave generators are introduced in the ensuing paper. In the first proposed square-wave generator circuit, one Operational Trans-resistance Amplifier (OTRA) and two passive components are involved, along with two NMOS depletion mode transistors. This circuit generates a square-wave with almost equal and fixed duty cycles. The second proposed circuit is able to control both on-duty and off-duty cycles independently with the help of two passive components, two NMOS depletion mode transistors, and two diodes connected to the circuit. The frequency of the proposed circuits can be adjusted with the passive components connected to the circuit. Moreover, electronic tuning can also be achieved with the proposed circuits. The measured results that are included in the paper show the linear variation of a time period as compared with existing OTRA based square waveform generator. The performance of the proposed circuits is examined while using SPICE models. These circuits are built on a laboratory breadboard using commercially available Current Feedback Operational Amplifier (AD844 AN) and passive components are connected externally and tested for square waveform generation. The obtained results demonstrate good agreement with the theoretical values.

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Section: Introductionmentioning

confidence: 99%

Electronic Tuning Square-Wave Generators with Improved Linearity Using Operational Transresistance Amplifier

Pittala¹,

Srinivasulu

2020

JLPEA

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“…In recent past, operational transresistance amplifier (OTRA) has gained much consideration from several researchers, due to its inherent pros like bandwidth independent of closed loop gain, higher slew rate, and simplicity in assimilating the effect of parasitic capacitances at the input ports. As a result, OTRA is being used widely for signal processing and generating applications (see previous works and the references cited therein). Consequently, several authors presented different OTRA‐based SO topologies in which oscillators with FO of form 1/2πRC are presented in previous literatures .…”

Section: Introductionmentioning

confidence: 99%

New sinusoidal oscillator configurations using operational transresistance amplifier

Komanapalli

Pandey

2019

Circuit Theory & Apps

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The objective of this brief is to introduce four new structures of electronically tunable sinusoidal oscillators (SOs) designed using operational transresistance amplifier (OTRA). Each of the proposed SO consists of forward path derived from a generic structure along with one/two OTRA-based resistive gain stages or differentiator in its feedback path. All the proposed SOs enjoy independent tuning of the frequency of oscillation (FO) through resistors without affecting the condition of oscillation (CO). Further, all topologies are found to exhibit low f o sensitivities at all frequencies with respect to circuit parameters, and the second topology is capable of achieving very low frequencies (VLFs) using less RC component spread and provides linear tuning too. The fourth circuit provides quadrature output. The proposed SOs have been successfully implemented and verified in 180-nm CMOS technology node using ADE (analog design environment) tool Cadence Virtuoso. Both prelayout and postlayout simulation results have been included. To assess the oscillator prefabrication performances, Monte Carlo and process-voltage-temperature (PVT) analyses have been performed. The total harmonic distortion (THD) is observed to be less than 3.5%.

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Design of 1-Bit FinFET Sum Circuit for Computational Applications

Pittala¹,

Vijay

2021

Advanced Techniques for IoT Applications

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Four new oscillators using operational transresistance amplifier

Cited by 7 publications

References 27 publications

Electronic Tuning Square-Wave Generators with Improved Linearity Using Operational Transresistance Amplifier

Electronic Tuning Square-Wave Generators with Improved Linearity Using Operational Transresistance Amplifier

New sinusoidal oscillator configurations using operational transresistance amplifier

Design of 1-Bit FinFET Sum Circuit for Computational Applications

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