Single OTRA Based Low Frequency Sinusoidal Oscillator Realization

Komanapalli, Gurumurthy; Pandey, Neeta; Pandey, Rajeshwari

doi:10.1088/1757-899x/225/1/012151

Cited by 8 publications

(5 citation statements)

References 18 publications

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“…Furthermore, it is interesting to note that the scaling factors in the numerator of the proposed circuits do not take part in CO unlike topologies in previous works thereby making frequency scaling simpler.…”

Section: Proposed Oscillator Configurationsmentioning

confidence: 99%

“…On the other hand, the structures that use FO expression wherein a term like

\sqrt{|1 - k|}

appears in numerator or denominator or both where k is a resistive gain term are capable of generating very low frequency (VLF) without using high values of passive components. However, these topologies suffer high FO sensitivity to passive component variations.…”

Section: Introductionmentioning

confidence: 99%

“…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 . The SO topologies of previous studies provide with difference term in the numerator in the expression of FO and therefore may be suitably employed as VLF oscillators.…”

Section: Introductionmentioning

confidence: 99%

“…A comparative study of all SO topologies using various analog building blocks (ABBs) having scaling factor (

\sqrt{k}

and/or

\sqrt{|1 - k|}

Section: Introductionmentioning

confidence: 99%

“…A comparative study of all SO topologies using various analog building blocks (ABBs) having scaling factor (

\sqrt{k}

and/or

\sqrt{|1 - k|}

) either in the numerator/denominator or both in the expression of FO has been presented in Table . These existing SO configurations have been designed using op‐amps, current feedback operation amplifier (CFOA), current differencing buffered amplifier (CDBA), OTRA, combination of operational transconductance amplifier (OTA), and positive four terminal floating nullor (pFTFN) . The inspection of comparative Table divulges that existing structures use excessive ABBs; use more than six resistors and more than two capacitors and produce single‐phase oscillations; use similar ABBs while Kumar et al employ different ABBs; are designed using op‐amps and have restricted performance at higher frequencies due to gain bandwidth dependency and slew limitation of op‐amps; provide only single phase (S) output whereas Lahiri gives quadrature (Q) response; lack electronic tunability, (circuits C, D, E, G); do not support independent control of FO without disturbing CO (circuits C, E, J); have high FO sensitivities to component variations; use high‐value capacitors (order of nF) in attaining VLFs, which is not favorable from the IC fabrication viewpoint; imposes more stringent requirements in achieving variable frequencies as the scaling factor ( k ) appears in CO …”

Section: Introductionmentioning

confidence: 99%

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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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Section: Proposed Oscillator Configurationsmentioning

confidence: 99%

“…On the other hand, the structures that use FO expression wherein a term like