Basic operational transconductance amplifier applications

Previous studies havefocused on the new mem-elements after the experimental realization of memristor which is the the fourth passive circuitelement. This research presents a simple operational transconductance amplifier OTA -based memcapacitor and meminductor emulator circuit that does notcomprise a mutator circuit. Each emulator was verified using the LTspicesimulation program, and the simulation results were found to be compatible withthe characteristic behaviors of the memcapacitor and meminductor. Cengiz; Cam, Ertuogrul. Home An Operational Transconductanc

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• Introduction to Operational Transconductance Amplifier (OTA)
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• An Operational Transconductance Amplifier-based Memcapacitor and Meminductor
• DESIGN OF OPERATIONAL TRANSCONDUCTANCE AMPLIFIER FOR APPLICATION IN ACTIVE FILTERS: A REVIEW
• operational transconductance amplifier
• Engineering:Operational transconductance amplifier

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Introduction to Operational Transconductance Amplifier (OTA)

Skip to Main Content. A not-for-profit organization, IEEE is the world's largest technical professional organization dedicated to advancing technology for the benefit of humanity. Use of this web site signifies your agreement to the terms and conditions. The macromodel is based on a differential input balanced output OTA with finite input and output impedance. The development of the macromodel is based on four design stages providing input and output characteristics, limiting the range of operation controlled by limiting circuit of diodes, addition of non-linearity of the OTA using power series terms, and providing balanced output.

The obtained simulation results reflect close agreement between those from macromodel and those of the transistor-level with reduction in computation time.

Moreover, tuning of the filter for variable gain, bandwidth, and notch frequency is also tested using both the macromodel and CMOS-OTA. Article :. DOI: Need Help?

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The book can be used as a reference book by researchers and a textbook for graduate and postgraduate courses in the related to electronic devices or analog filters. It can also be used in other courses related to analog, hybrid signals, circuits and systems etc. Explore Plus. Higher Education and Professional Books. Applied Sciences and Other Technologies Books. Be the first to Review this product.

An Operational Transconductance Amplifier-based Memcapacitor and Meminductor

It is demonstrated that the efficiency of the recycling folded-cascode is equivalent to that of a telescopic OTA. High-gain amplifiers use cascode structures or multistage designs with long channel length transistors biased at low current levels while high-bandwidth amplifiers use single-stage designs with short channel length transistors biased at high current levels. For single-stage amplifiers, the folded-cascode FC OTA has a higher signal swing than a telescopic OTA while still presenting a single parasitic pole and relatively large DC gain, and hence it is commonly used for high-frequency applications [ 5 , 7 — 18 ]. For such applications the typical FC structure presents some limitations. PMOS drivers are predominately used for their lower flicker noise and higher frequency parasitic pole, but the bandwidth is limited because of the lower carrier mobility in PMOS devices. If NMOS drivers are used, the settling behavior suffers because of the lower-frequency parasitic pole, and in order to extend the bandwidth, several phase compensation schemes have been reported in literature [ 8 — 12 ]. Another limitation of the FC, regardless of driver type, is that the maximum slewing current is roughly half the total OTA current unlike the telescopic OTA which utilizes the total current. It is shown that the recycling folded-cascode RFC OTA can alleviate many of the conventional FC limitations; it can settle faster and more accurately, boost slew rate, and improve overall efficiency. In multistage amplifiers, cascading of individual gain stages increases the overall amplifier gain, but each stage introduces a low frequency pole, which produces a negative phase shift and degrades the phase margin.

DESIGN OF OPERATIONAL TRANSCONDUCTANCE AMPLIFIER FOR APPLICATION IN ACTIVE FILTERS: A REVIEW

Operational transconductance amplifier — Schematic symbol for the OTA. Unlike the traditional op amp, it has two additional biasing inputs … Wikipedia. Als Eingangsschaltung wird immer ein… … Deutsch Wikipedia. Current differencing transconductance amplifier CDTA is a new active circuit element. Properties The CDTA is free from parasitic input capacitances and it can operate in a wide frequency range due to current mode… … Wikipedia.

operational transconductance amplifier

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Engineering:Operational transconductance amplifier

This book provides a detailed study of Operational Transconductance Amplifier OTA based circuits, their realizations and applications. The book is primarily concerned with the building blocks and their applications in linear and nonlinear circuit design, presented in a simplified and methodical way. The nine chapters cover important building blocks, ideal and non-ideal component simulators, and different types of filters and oscillators, using OTA as the active device. It includes: The introduction and application of an OTA for the realization of the basic building blocks. Nonlinear applications of OTAs in comparator, zero crossing detector and schmitt trigger circuits. Realization of non-ideal grounded and floating inductors. Realization of component multipliers used in instrumentation systems and the IC fabrication of large valued resistors and capacitors.

Hello students I hope you all are doing great. In a normal operational amplifier, the value of output voltage is the multiple of the input voltage with the gain. While the OTA is voltage to a current amplifier that has output current multiple of input voltage which are multiple of gain.

Dt Sheet. This new class of operational amplifier not only includes the usual differential input terminals, but also contains an additional control terminal which enhances the device's flexibility for use in a broad spectrum of applications. The amplifier incorporated in these devices is referred to as an Operational Transconductance Amplifier OTA , because its output signal is best described in terms of the output-current that it can supply: Circuit Description A simplified block diagram of the OTA is shown in Figure 2. Figure 3A shows the basic type of currentmirror which is comprised of two transistors, one of which is diode-connected. For example, communications and industrial applications including modulators, multiplexers, sample-and-hold-circuits, gain control circuits and micropower comparators are shown and discussed. In addition, circuits have been included to show the operation of the OTA being used in conjunction with CMOS devices as post-amplifiers.

This paper reviews about the various kind of operational amplifiers used for amplifying the signal or for other applications. Nowadays, Operational amplifiers are used in all streams like electronics, electrical, medical, image processing etc. So the requirement is to make an op-amp which will able to does all type of operations. Various kind of operational amplifiers are used like cascode amplifiers, folded cascode amplifiers, operational transconductance amplifiers etc. The basic requirement of operational amplifiers is it should have a high gain and low power consumption. For making the circuit with less power consumption, various techniques are used.

The operational transconductance amplifier OTA is an amplifier whose differential input voltage produces an output current. Thus, it is a voltage controlled current source VCCS. There is usually an additional input for a current to control the amplifier's transconductance. The OTA is similar to a standard operational amplifier in that it has a high impedance differential input stage and that it may be used with negative feedback.