Index Catalog // ScholarsArchive@OSU

Modeling of subthreshold current of GaAs MESFET and the design of voltage reference circuit

Creator:: Or, Pee-Keong
Abstract:: The characteristic of the subthreshold current in a GaAs MESFET exhibits a negative exponential function with Vgs. After studying the behavior of this current in this region over a range of temperature and drain bias voltages, a subthreshold current model was developed. The model was implemented in a circuit simulation...
Resource Type:: Masters Thesis

A high-swing CMOS operational amplifier topology

Creator:: Yang, John Jian
Abstract:: A circuit topology for high-swing, high-linearity CMOS operational amplifiers has been developed. The technique uses parallel-connected p- and n-channel input pairs to realize an input common-mode voltage range nearly equal to the total power supply voltage. High linearity is achieved by summing the DC bias and AC small-signal currents so...
Resource Type:: Masters Thesis

CMOS analog design using a digital gate array

Creator:: Liu, Tian-chen
Abstract:: The core area of a conventional CMOS digital gate array consists of only one size of NMOS device and one size of PMOS device. Both primitives have fixed minimum channel lengths, and this has significantly impeded analog applications. This work has shown that by forming series and parallel interconnections between...
Resource Type:: Masters Thesis

A high-swing class-AB CMOS operational amplifier

Creator:: Yu, Choung
Abstract:: A high-swing, high-linearity Class-AB CMOS operational amplifier suitable for high speed application is presented. It does not exhibit large-signal slewing effects as do others; its output current is limited by MOSFET aspect ratios and the total power supply voltage. A rail-to-rail common-mode input range is achieved by a topology which...
Resource Type:: Masters Thesis

Operational amplifier compensation using doublet-decompression for switched-capacitor circuits

Creator:: Jen, Shin D.
Abstract:: A frequency compensation technique for increasing the settling speed of two-stage operational amplifiers used in switched-capacitor applications has been developed. By properly decompressing the pole-zero doublet to form a three-pole one zero system, the settling speed is increased up to 50 percent as compared to the optimized two-pole system.
Resource Type:: Masters Thesis

Analytical model of GaAs MESFET output conductance with frequency and temperature dependent parameters

Creator:: Lam, Steven C. F.
Abstract:: The output characteristics of a conventional GaAs depletion-mode MESFET device have been investigated. One of the important parameters of the small-signal GaAs MESFET model, g[subscript ds] (output conductance), is shown to be frequency and temperature dependent. Variations in g[subscript ds] are a serious problem in many analog and digital circuits...
Resource Type:: Masters Thesis

Design of GaAs monolithically integrated optical receiver amplifier

Creator:: Ju, Shu-ing
Resource Type:: Masters Thesis

A chopper-stablized CMOS operational amplifier

Creator:: Ann, Seung-Han
Abstract:: The chopper-stabilized operational amplifier has good low frequency noise properties. Unfortunately a simple technique for simulation of the chopper-stabilized operational amplifier has not been available. This thesis describes the implementation of a differential amplifier using chopper stabilization and its circuit modeling for the SPICE simulation. This circuit has been designed...
Resource Type:: Masters Thesis

A CAD noise model for chopper-stabilized switched-capacitor filters

Creator:: Shenoy, Ravindra Umanath
Abstract:: A modeling technique for simulating the noise performance of chopper-stabilized switched-capacitor filters using SPICE2 is presented. A method for selection of switched-capacitor network (SCN) stages to be chopped and an op amp topology for low noise applications are also outlined. Validity of the modeling is verified by the close agreement...
Resource Type:: Masters Thesis

A fast-settling folded-cascode CMOS operational amplifier

Creator:: Abu-Dayeh, Mahmoud A.
Abstract:: A fast-settling CMOS operational amplifier using the folded-cascode topology has been designed. The design is based on a theory developed by Yang et al for the optimum settling time of two-pole systems for switched-capacitor applications. The theory states that the two poles are separated by a given factor in order...
Resource Type:: Masters Thesis

A CMOS differential line driver

Creator:: Jiang, William
Abstract:: A short-circuit-protected line-driver circuit is particularly adapted for use in a CMOS differential line-driver system, where one line-driver circuit provides a true output signal, and another line-driver circuit provides a complementary false output signal. A short-circuit is sensed by measuring current through a secondary pull-up transistor, and disabling a primary...
Resource Type:: Masters Thesis

Model and design of cmos phase-locked loop

Creator:: Shum, Daniel K.
Abstract:: This thesis will examine the model and design technique of a self-contained analog CMOS Phase-Locked Loop. This system has an adaptable filter and demodulator for an oscillating frequency of up to 1000 KHz and it is programmable by means of an external resistor and capacitor. The first topic to be...
Resource Type:: Masters Thesis

A time-multiplexed switched-capacitor circuit for neural network applications

Creator:: Hansen, James Edward, 1962-
Abstract:: Analog computation in the form of neural networks is currently receiving much attention. Existing algorithms cannot be easily implemented in hardware because of the large number of neurons needed and the number of connections necessary between them. These problems have motivated development of alternatives to a conventional implementation. Hence, a...
Resource Type:: Masters Thesis

MOS switched-current biquadratic filters

Creator:: Lee, Bor
Abstract:: A MOS biquadratic (biquad) filter employing the switched-current technique is reported. The circuit uses current-mode processing which can offer wide bandwidth, low voltage operation, and can be implemented with standard CMOS technology. Examples of lowpass, highpass, and bandpass filters are given which illustrate the synthesis procedures and the versatility of...
Resource Type:: Masters Thesis

A study of the temperature dependence of the DC current-voltage characteristics of AlGaAs/GaAs heterojunction bipolar transistors with application to bandgap voltage reference sources

Creator:: Gazeley, William G.
Abstract:: The bandgap voltage reference technique, as implemented in Silicon technology, has evolved to a state of advanced development and become the method of choice for temperature independent voltage biasing in integrated circuits. The heterojunction bipolar transistor (HBT), fabricated from epitaxial A1GaAs /GaAs, is developing to a point where basic circuit...
Resource Type:: Masters Thesis

Distortion analysis of switched-current circuits

Creator:: Lee, Wing-sun R.
Abstract:: Recently, switched-current circuits have received great attention because they offer potentially better performance in terms of speed, low voltage power supplies, and accuracy in mixed-mode analog-digital signal processing. In this thesis, the distortion characteristics, DC offset and AC gain errors induced by the threshold voltage, channel width, channel length, and...
Resource Type:: Masters Thesis

Digitally-programmable switched-current filters

Creator:: Yesilyurt, Ayse Gul
Abstract:: Digitally-programmable filters have been an ongoing research topic for a number of years. The first such filters were FIR transversal filters using Charge-Coupled Devices (CCD's) and IIR recursive filters using switched-capacitor (SC) techniques. Although both techniques achieve excellent results, they require non-standard and/or additional IC fabrication steps. Low substrate doping...
Resource Type:: Masters Thesis

Fully-differential current-mode CMOS circuits and applications

Creator:: Zele, Rajesh H.
Abstract:: With increasing interest in current-mode analogue processing due to its high performance properties such as speed, bandwidth and accuracy compared to voltage-mode processing, new current-mode alternatives to various conventional circuit designs are appearing. In this report, a novel circuit design to construct a fully-differential current-mode operational amplifier ( OP-AMP )...
Resource Type:: Masters Thesis

Current-feedthrough cancellation techniques in switched-current circuits

Creator:: Lao, Paul A.
Resource Type:: Masters Thesis

A universal CMOS current-mode operational amplifier

Creator:: Botelho, Cindy
Abstract:: It has become customary in electrical engineering to think of signal processing in terms of voltage variables to the exclusion of current variables. This tendency has resulted in voltage signal processing circuits such as voltage-controlled voltage sources (VCVS) and voltage-mode operational amplifiers. However, the VCVS operational amplifier has several limitations...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Modeling of subthreshold current of GaAs MESFET and the design of voltage reference circuit

A high-swing CMOS operational amplifier topology

CMOS analog design using a digital gate array

A high-swing class-AB CMOS operational amplifier

Operational amplifier compensation using doublet-decompression for switched-capacitor circuits

Analytical model of GaAs MESFET output conductance with frequency and temperature dependent parameters

Design of GaAs monolithically integrated optical receiver amplifier

A chopper-stablized CMOS operational amplifier

A CAD noise model for chopper-stabilized switched-capacitor filters

A fast-settling folded-cascode CMOS operational amplifier

A CMOS differential line driver

Model and design of cmos phase-locked loop

A time-multiplexed switched-capacitor circuit for neural network applications

MOS switched-current biquadratic filters

A study of the temperature dependence of the DC current-voltage characteristics of AlGaAs/GaAs heterojunction bipolar transistors with application to bandgap voltage reference sources

Distortion analysis of switched-current circuits

Digitally-programmable switched-current filters

Fully-differential current-mode CMOS circuits and applications

Current-feedthrough cancellation techniques in switched-current circuits

A universal CMOS current-mode operational amplifier

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