Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 26 for “"Operational amplifiers"”.
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Design of micropower operational amplifiers
The operational amplifier is a fundamental building block for electronic devices and systems. The advancement of modern electronic technology has been setting more performance demand on the underlying integrated circuits including the operational amplifier. Reduction in power consumption and …
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Ultra-low voltage CMOS operational amplifiers
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Investigation of stability for composite operational amplifiers
… [1] on the possibilities of employing composite operational amplifiers to extend the high frequency performance of conventional RC active filters · it became evident that theoretical predictions of stability and experimental results did not agree. Other publications concerned with composite …
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Inductive compensation of operational amplifiers in feedback circuits
In this thesis I designed, implemented, and tested an integrated-circuit feedback compensator that uses inductors as compensation elements. Introducing inductors as feedback elements makes it possible to implement lead compensators using shunt topologies, which preserve the closed loop response of …
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Increasing the Dynamic Range of Audio THD Measurements Using a Novel Noise and Distortion Canceling Methodology
… for measuring Total-Harmonic-Distortion (THD) of operational amplifiers functioned when compared with two standard methodologies, and whether the new methodology offers any improvement in noise floor and dynamic range along with distortion canceling of the sine-wave source used in the testing. The …
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A high-speed general-purpose externally compensated operational amplifier
Although most modern monolithic solid state operational amplifiers (op-amps) are internally compensated, externally compensated units provide an invaluable degree of freedom to analog designers. As a result, these op-amps offer true 'general purposeness,' since allowing the user to choose the …
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CMOS current amplifiers : speed versus nonlinearity
… design using various types of current-mode amplifiers. These circuits are analysed and realised using modern CMOS integration technologies. The dynamic nonlinearities of these circuits are discussed in detail as in the literature only linear nonidealities and static nonlinearities are …
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A study of modal-space control of a beam-cable structure: experiment and theory
… controller built around integrated circuit operational amplifiers. This thesis compares open-loop experimental response and closed-loop experimental and theoretical response on the basis of Fast Fourier Transforms of transient time data.
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Educational hardware for feedback systems
… of general-purpose and high-performance operational amplifiers is created. Hardware for a web-based laboratory on canonical second-order systems is implemented. Cheap magnetic levitation kits for in-term projects are made even cheaper. And finally, the inverted pendulum - a decades-old …
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Wide common mode input operational amplifier with serially programmable output offset
Operational amplifiers continue to develop to meet modern demands on performance. This document describes an operational amplifier designed for a highly specific telecommunications application - to serve as the buffer between an I/Q demodulator and Gm-C filter. Requirements set forth by this …
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Analysis of single event transients in arbitrary waveforms using statistical window analysis
… exposures of commercial off-the-shelf (COTS) operational amplifiers, laser-induced transients in Complementary Metal-Oxide-Semiconductor (CMOS) phase-locked loops, and simulated transients in digital and analog circuits.The performance of the IRES filter in noisy environments shows that …
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Circuit level synthesis for delta-sigma converters
… circuit contains robustly generated differential operational amplifiers and comparators. Furthermore, switched capacitors are scaled for minimal kT/C noise while switch sizes are synchronously adjusted to accommodate these values. Results of the SPICE simulations of the generated circuits compare …
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Noise analysis of switched capacitor filters
… in SC filters are switch transistors and the operational amplifiers. These noise sources were modeled as switch thermal white noise and op-amp input white noise. The existence of direct and sample-and-held noise outputs were demonstrated. The direct noise, resulting from direct circuit path, …
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ΚΥΜΑΤΙΚΑ ΦΙΛΤΡΑ ΔΙΑΚΟΠΤΟΜΕΝΟΥ ΠΥΚΝΩΤΗ
… AND CAPACITANCE AREA MINIMIZATION. THENUMBER OF OPERATIONAL AMPLIFIERS, IN THE SIMULATED UNIT-ELEMENT FILTERS, IS ESSENTIALLY LOW IN COMPARISON TO EARLIER PRESENTED, PARASITIC INSENSITIVE WAVE SCFILTERS AND TO LEAPFROG TYPE SC FILTERS. MULTIPLEXED SIMULATED LC FILTERS AND FILTERS WITH …
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Operational Amplifier Bandwidth Extension Using Negative Capacitance Generation
A need for high bandwidth operational amplifiers, or op-amps, exists for certain applications. This need requires research in the area of op-amp bandwidth extension. The proposed method of this thesis uses Negative Capacitance Generation (NCG), which involves using the Miller effect to generate an …
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Analog and digital control of an electronic throttle valve
… engine. The first controller was designed using operational amplifiers and other analog componentry to realize a proportional-integral controller and feedback loop. The second controller utilized a programmable digital microcontroller to replace the analog componentry for signal processing. The …
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Automatic generation of high level fault simulation models for analogue circuits
High level modelling (HLM) for operational amplifiers (op amps) has been previously carried out successfully using models generated by published automated model generation (AMG) approaches. Furthermore, high level fault modelling (HLFM) has been shown to work reasonably well using manually designed …
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Design and comparison of two brushless DC drives for an electric propulsion system of solar-power unmanned aerial vehicles
… The circuit combines a PI controller with fast operational amplifiers with a built-in linearizing feedback photodiode loop of a linear optocoupler. A 3D stator model was built to analyse the mechanical resonance frequencies and possible excitation by the electromagnetic radial force leading to …
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Dynamic amplifiers for analog-to-digital converters
… newer challenges, especially for the design of operational amplifiers (op-amps) to implement gain. In this dissertation, dynamic/latch-based/regenerative amplifiers are explored where interrupted regeneration is used to implement the gain function. First, a 6-b current-domain interpolating …
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CMOS/Bipolar current conveyor design and development
… were used to build examples of current feedback operational amplifiers (CFOAs), and the cascode type CCIl+ offered a voltage gain error of less than I%, largest bandwidth and best P SRR.
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