Index Catalog // ScholarsArchive@OSU

Switched-current logic for digital circuit design

Creator:: Subramanian, Vivek
Resource Type:: Masters Thesis

Switch-capacitor Power Amplifier with Enhanced Power Back-off Efficiency and Linearity

Creator:: Qiao, Bo
Abstract:: Nowadays, wireless communication systems use high-order quadrature amplitude modulation (QAM) together with orthogonal frequency-division multiplexing (OFDM) to increase the link capacity and robustness. These signals always have large peak-to-average power ratio (PAPR) and require power amplifiers (PAs) achieve both high efficiency and linearity simultaneously. For the efficiency, the complementary metal...
Resource Type:: Dissertation

Sensor Interface Circuit Design towards CMOS Scaling

Creator:: Liu, Jialin
Abstract:: Sensor system plays an important role in connecting everything including human body to the electrical information systems that we have built and that we are going to build, to make the world more intelligent and efficient. One of the key propulsive forces behind these emerging techniques is CMOS scaling that...
Resource Type:: Dissertation

Power amplifier design in digital CMOS processes

Creator:: Forejt, Brett E.
Abstract:: The ability to integrate designs from board level, multi-chip modules to single process solutions is highly attractive in today's PC multimedia industry. Saving board area and chip count will decrease the production cost of personal computing hardware and increase profitability. The ability to integrate analog circuit capability and it's reference...
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

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

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

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

Low-voltage Tracking RC Compensated OTA and a Rail-to-Rail Input and Output Operational Amplifier

Creator:: Kuo, Yu-Wen
Abstract:: The operational transconductance amplifier (OTA) is a fundamental building block in analog and mixed-signal systems. This research describes a process-, voltage-, and temperature- (PVT) insensitive low-voltage tracking RC compensation scheme considered for two-stage CMOS OTAs, which cancels the pole due to the load capacitance using a Miller zero generated by...
Resource Type:: Masters Thesis

High speed analog circuit design using the heterostructure insulated gate field effect transistor

Creator:: Smith, Alexander B.
Abstract:: As Si MOS approaches its maximum limits in speed and bandwidth, new devices are desired to meet the needs of high speed communications and signal processing. A device that exhibits superior performance to Si MOS, BJT, and GaAs technology is the HEMT (high electron mobility transistor). The HEMT offers superior...
Resource Type:: Masters Thesis

High accuracy CMOS switched-current ladder filters

Creator:: Hoei, Jung-sheng
Abstract:: Clock-feedthrough effects, channel-length modulation and device mismatch are the main causes of the inaccuracy of Switched-Current (SI) circuits. In this paper, these non-ideal effects are analyzed. A high-performance current mirror, namely regulated cascode current mirror, which eliminates drain voltage variation problem is introduced. By using this current mirror as a...
Resource Type:: Masters Thesis

gm/ID Design Techniques for Low-power High-performance CMOS Analog Integrated Circuits

Creator:: Aueamnuay, Chaiyanut
Abstract:: The gm/ID-based design of analog integrated circuits introduced in 1996 employs an empirical transistor sizing methodology using SPICE-generated lookup tables that enables good agreement between simulations and specifications. This thesis introduces a new SPICE lookup table that extends the gm/ID approach to the Miller pole-splitting frequency compensation of the classical...
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

Energy-efficient OTA architectures using load-pole cancellation

Creator:: Ramakrishna, Pavan Kumar
Abstract:: The CMOS two-stage Operational Transconductance Amplifier (OTA) has been a key enabler for mixed-signal IC design for nearly four decades . This research focuses on a modified two-stage CMOS OTA that features load-pole cancellation (LPC); i.e., the resulting architecture is essentially a two-stage CMOS OTA with no load capacitance. The...
Resource Type:: Masters Thesis

Efficient Deep Learning Methods for Biomedical Applications

Creator:: Thota, Narayana Bhagirath
Abstract:: Deep Learning methods have been gaining a lot of significance for various Biomedical applications for diagnosing several types of diseases. Two applications considered here are: 1) Diabetic Retinopathy Detection and 2) ECG signal Classification (or Arrhythmia Detection). Diabetic Retinopathy (DR) is a major cause of blindness in Diabetic patients, and...
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

Design of high-speed summing circuitry and comparator for adaptive parallel multi-level decision feedback equalization

Creator:: Gao, Hairong
Abstract:: Multi-level decision feedback equalization (MDFE) is an effective sampled signal processing technique to remove inter-symbol interference (ISI) from disk read-back signals. Parallelism which doubles the symbol rate can be realized by utilizing the characteristic of channel response and decision feedback equalization algorithm. A mixed-signal IC implementation has been chosen for...
Resource Type:: Masters Thesis

Design of high-speed low-power analog CMOS decision feedback equalizers

Creator:: Su, Wenjun
Abstract:: Decision feedback equalizer (DFE) is an effective method to remove inter-symbol interference (ISI) from a disk-drive read channel. Analog IC implementations of DFE potentially offers higher speed, smaller die area, and lower power consumption when compared to their digital counterparts. Most of the available DFE equalizers were realized by using...
Resource Type:: Masters Thesis

Design of high-speed adaptive parallel multi-level decision feedback equalizer

Creator:: Xiang, Yihai
Abstract:: Multi-level decision feedback equalization (MDFE) is an effective technique to remove inter-symbol interference (ISI) from disk readback signals, which uses the simple architecture of decision feedback equalization. Parallelism which doubles the symbol rate can be realized by setting the first tap of the feedback filter to zero. A mixed-signal implementation...
Resource Type:: Masters Thesis

Design of high-performance operational amplifiers using an embedded compensation technique

Creator:: Ziazadeh, Ramsin M.
Resource Type:: Masters Thesis

Design of GaAs monolithically integrated optical receiver amplifier

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

Design of CMOS switched-current filters

Creator:: Fiez, Theresa S.
Abstract:: The design and implementation of Switched-Current (SI) ladder filters is described. SI filters require only a standard digital CMOS process and the power supply voltage requirement is low. SI circuits also can be potentially operated at higher frequencies than Switched-Capacitor (SC) filters due to the low-impedance wideband nodes of the...
Resource Type:: Dissertation

Design considerations for fast-settling operational amplifiers

Creator:: Yang, Howard C.
Abstract:: The design considerations for fast-settling operational amplifiers (opamps) differ significantly between sampled-data switchedcapacitor (SC) and conventional continuous-time applications. In SC circuits, the shape of the output voltage waveform of an opamp is of no consequence provided that the output settles to within a specified tolerance of its steady-state value prior...
Resource Type:: Dissertation

Design and computer-aided optimization of RF CMOS power amplifiers

Creator:: Gupta, Ravi
Abstract:: In recent years, there has been an extensive effort to develop low-cost implementations of radio frequency integrated circuits for consumer applications. This thesis is a research effort in the design and implementation of integrated RF CMOS Power Amplifiers (PAs). A significant challenge in the implementation of RF CMOS ICs is...
Resource Type:: Dissertation

Design and computer aided optimization of a fully integrated CMOS RF distributed amplifier

Creator:: Ballweber, Brian M.
Abstract:: Advancements in the sophistication and complexity of modern electronic systems are creating a need for highly integrated systems with ever higher operational frequencies. The economical demands of these systems dictate that they be implemented using low cost fabrication technologies, such as digital CMOS. One of the major challenges facing circuit...
Resource Type:: Masters Thesis

Current-feedthrough cancellation techniques in switched-current circuits

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

Current-feedthrough cancellation technique for current-mode T/H circuits

Creator:: Young, David Y. W.
Abstract:: In this paper, an analysis of the clock-feedthrough effects in switched-current (SI)' circuits will be presented. The clock-feedthrough effects caused by the non-ideal characteristic of MOS switches when they are turned off limit the accuracy of the analog track-and-hold (T/H) circuits. A model to analyze and characterize this effect is...
Resource Type:: Masters Thesis

Current mode analog and digital circuit design

Creator:: Liang, Guojin
Abstract:: In this dissertation, two important current mode circuit design subjects have been explored. In the first part, the switched-current circuit technique has been investigated. The fundamental performance and limitations of this technique are explored. One of the major limitations, the signal distortion caused by clock feedthrough has been substantially reduced...
Resource Type:: Dissertation

CMOS low noise amplifier design utilizing monolithic transformers

Creator:: Zhou, Jianjun J.
Abstract:: Full integration of CMOS low noise amplifiers (LNA) presents a challenge for low cost CMOS receiver systems. A critical problem faced in the design of an RF CMOS LNA is the inaccurate high-frequency noise model of the MOSFET implemented in circuit simulators such as SPICE. Silicon-based monolithic inductors are another...
Resource Type:: Dissertation

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

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

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

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

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

A photodetecting device that rejects ambient light

Creator:: Li, Ning
Abstract:: The integration of photodetectors with IC circuits provides a significant improvement over conventional designs. Featuring noise reduction, extended frequency responses, lower power consumption, and data operations, these integrated devices open challenging opportunities for many applications. One type of photodetector has the potential for important applications in the life science and...
Resource Type:: Masters Thesis

A P-well GaAs MESFET technology

Creator:: Canfield, Philip C.
Abstract:: The semiconductor gallium arsenide (GaAs) has many potential advantages over the more widely used semiconductor silicon (Si). These include higher low field mobility, semi-insulating substrates, a direct band-gap, and greater radiation hardness. All these advantages offer distinct opportunities for implementation of new circuit functions or extension of the operating conditions...
Resource Type:: Dissertation

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

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

A Fully Integrated Bio-potential Low-noise Amplifier Utilizing Capacitor Multipliers

Creator:: Yong, OnnLim
Abstract:: In any biomedical signal acquisition system, a front-end amplifier is needed to amplify low amplitude bio-signals while filtering out any unwanted low-frequency artifacts. The design of low frequency poles within the sub-Hz range implies very large time-constants which goes against system integrability. In recent years, the pseudo resistor has been...
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 delta-sigma pulse width modulator with pulse dithering

Creator:: Lewison, Richard S.
Abstract:: Pulse Width Modulation (PWM) has been used extensively for motor control, DC-AC converters, DC-DC converters and in audio applications. The conventional method of generating a pulse width modulated signal involves generating an accurate sawtooth or triangle wave using analog circuits. In CMOS, being analog circuit intensive puts extra constraints on...
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

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 90.5dB DR 1MHz BW Hybrid Two Step ADC with CT Incremental and SAR ADCs

Creator:: Wang, Yanchao
Abstract:: The sensors in real time data processing IoT devices require high resolution and sub-MHz data converters, usually implemented as Incremental ADCs due to the advantages of oversampling technique and low latency. In discrete time incremental (IDT) ADCs, the sampling switch non-linearity, charge injection degrade the resolution, and power hungry OPAMPs...
Resource Type:: Dissertation

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