Index Catalog // ScholarsArchive@OSU

Oscillators and phase locked loops for space radiation environments

Creator:: Vandepas, Martin
Abstract:: Circuits operating outside the earth’s atmosphere are more vulnerable to cosmic radiation and require special design consideration. The purpose of this work is to explore methods of mitigating the effect of radiation in phase locked loop (PLL) circuits. Several voltage controlled oscillators (VCOs) and two complete PLLs are designed and...
Resource Type:: Masters Thesis

OP-AMP free SC biquad LPF and delta-sigma ADC

Creator:: Yoo, Kiseok
Abstract:: The objective of this work is to explore the feasibility of replacing conventional op-amps with inverters in switched-capacitor (SC) circuits. In order to verify the idea, a low-pass filter (LPF) and a second-order delta-sigma (∆Σ) analog-todigital converter (ADC) are designed in the 0.5-m CMOS technology. The low-pass filter structure is...
Resource Type:: Masters Thesis

Noise optimization for low-voltage CMOS audio preamplifier systems

Creator:: Brown, Matthew Eugene
Abstract:: There is a large and growing market for portable consumer audio products with very small size. As the size of these products is reduced, the area occupied by batteries becomes significant and hence limits the number of batteries to one. In order to build such small products, high levels of...
Resource Type:: Masters Thesis

Low voltage techniques for pipelined analog-to-digital converters

Creator:: Carnes, Joshua Kenneth
Abstract:: To realize pipelined ADCs in deep-submicron processes, low voltage techniques must be developed to work around problems created by limited supply voltages such as the floating switch dead zone, reduced SNR, and reduced OpAmp performance. This thesis analyzes standard and low voltage design issues for pipelined ADCs and proposes a...
Resource Type:: Masters Thesis

Investigation of a noise-shaping accelerometer interface circuit for two-chip implementation

Creator:: Zechmann, Jacob W.
Abstract:: The world market for sensors is several hundred million dollars growing at an annual rate of 20 percent with accelerometers comprising 19 percent of the market. With an increasing market, a wide range of applications with varying degrees of resolution are in demand. Therefore, there is sufficient motivation for developing...
Resource Type:: Masters Thesis

High-speed switched-capacitor filters based on unity-gain buffers

Creator:: Bruneau, David
Abstract:: In this work a new voltage buffer, the drain-follower, achieves 300MHz band-width with 2pF load, a dc gain of 0.993V/V, 1mV offset voltage, -60 dB total harmonic distortion at 1.4Vpp output voltage and 6.5mW power dissipation from 5V supply. A unity-gain buffer switched-capacitor biquad filter has been implemented in 0.5μm...
Resource Type:: Masters Thesis

High-speed CMOS dual-modulus presalers for frequency synthesis

Creator:: Desikachari, Ranganathan
Abstract:: Phase-locked loop (PLL) frequency synthesizers lie at the heart of most radio transceivers. An important objective of the electronics and communications industry is to design high-speed building blocks which dissipate the lowest possible power, and to ac- complish this with the cheapest technology. The dual-modulus prescaler is one of the...
Resource Type:: Masters Thesis

Generalized radix design techniques for low-power, low voltage pipelined and cyclic analog-digital converters

Creator:: Sharma, Vivek
Abstract:: This thesis proposes a novel technique for the design of pipelined and cyclic ADCs utilizing generalized radix gain stages. Several models have been proposed for the optimization of high performance pipelined ADCs by various researchers. This work builds upon them, using a simple but accurate model to estimate the optimal...
Resource Type:: Masters Thesis

Fast opamp-free delta sigma modulator

Creator:: Thomas, Daniel E.
Abstract:: Switched-capacitor (SC) circuits are commonly used for analog signal processing because they can be used to realize precision filters and data converters on an integrated circuit (IC). However, for high speed applications SC circuit operating speeds are limited by the internally-compensated opamps found in SC integrators, a common building block...
Resource Type:: Masters Thesis

Error canceling low voltage SAR-ADC

Creator:: Wen, Jianping
Abstract:: The design of a switched capacitor successive approximation A/D converter is discussed in this thesis. This design adopts a novel capacitance mismatch error cancellation algorithm proposed in references [25, 27]. Detailed charge domain analysis is given in this thesis, which results in an improvement of the proposed algorithm by tracing...
Resource Type:: Masters Thesis

Digital implementation of a mismatch-shaping successive-approximation ADC

Creator:: Coe, Matthew T.
Abstract:: Utilizing a two-capacitor topology, the digital implementation of an audio-band successive-approximation analog-to-digital converter (ADC) is explored in the context of mismatch-shaping where the mismatch estimates are accurate to the first order. A second-order Δ∑ loop was found to be effective in system simulations given a 0.1% capacitor mismatch. Spectral analysis...
Resource Type:: Masters Thesis

Design techniques for radiation hardened-phase locked loops

Creator:: Nemmani, Anantha Nag
Abstract:: Spacecrafts experience radiation in the course of their operation and all electronic equipment on board these spacecrafts has to be designed to withstand the effects of this radiation. This thesis describes the effects of total ionization dose (TID) and single event transients (SET) in phase-locked loops - an important circuit...
Resource Type:: Masters Thesis

Design of high-performance pipeline analog-to-digital converters in low-voltage processes

Creator:: Myers, Charles Grant
Abstract:: Pipeline analog-to-digital converters (ADCs) have long been used in high-speed systems for power-efficient data conversion. Broadband communication and video processing systems are placing high demands on converter accuracy and speed (above 14 bits and in the multiple-MHz range). The increasing converter requirements coupled with lower supply voltages in modern processes...
Resource Type:: Masters Thesis

Design of high efficiency step-down switched capacitor DC/DC converter

Creator:: Ma, Mengzhe
Abstract:: Recently, switched capacitor DC/DC converters are extensively used in portable electronic devices because they feature many advantages, such as high efficiency, small package, low quiescent current, minimal external components and low cost. In this thesis, two step-down switched capacitor DC/DC converters are designed. One has the fixed output options 1.5V,...
Resource Type:: Masters Thesis

Comparison of time-domain and frequency-domain phase noise analyses

Creator:: Vytyaz, Igor
Abstract:: This thesis presents a comparison of time-domain and frequency-domain algorithms for phase noise calculation in oscillators. Floquet theory provides the mathematical foundation for these calculations and the numerical methods employ perturbation projection vectors (PPVs). The PPVs are an estimate of an oscillator's sensitivity to noise. The in-house circuit simulator SPICE3...
Resource Type:: Masters Thesis

Characterization of a digital phase locked loop and a stochastic time to digital converter

Creator:: Geissenhainer, Erik D.
Abstract:: A digital phase locked loop (DPLL) and a statistical time-to-digital converter (STDC) were previously fabricated in a 0.35Âµm, 3.3V SOI CMOS process. This work summarizes these designs and characterizes the measured performance. Simulations supplement the measurements where applicable. The DPLL was found to reach a locked state under a limited...
Resource Type:: Masters Thesis

Area efficient D/A converters for accurate DC operation

Creator:: Greenley, Brandon Royce
Abstract:: The design of mixed-signal integrated circuits has evolved from simple analog and digital circuits operating on the same silicon substrate to the point that now we have complete system on a chip solutions for communication systems. The levels of integration needed to remain cost effective in today's integrated circuit (IC)...
Resource Type:: Masters Thesis

Area efficiency improvement of CMOS charge pump circuits

Creator:: Perigny, Ryan
Abstract:: In this thesis, the literature relating to charge pump dc-dc converters and their uses is reviewed. Charge pumps are useful in many circuits, including low-voltage circuits, dynamic random access memory circuits, switched-capacitor circuits, EEPROM's and transceivers. The important issues relating to charge pump design are power efficiency, output voltage ripple...
Resource Type:: Masters Thesis

An efficient switched capacitor buck-boost voltage regulator using delta-sigma control loop

Creator:: Rao, Arun
Abstract:: Voltage converters or charge pumps find their use in many circuits. They are extensively used in hand held devices as cell phones, pagers, PDA's and laptops. Some of the important issues relating to design of voltage regulators for handheld devices are size, efficiency and noise. Another important factor to be...
Resource Type:: Masters Thesis

Accurately tunable low-voltage continuous-time filters

Creator:: Vemulapalli, Gowtham
Abstract:: A tuning technique which tunes the continuous time filter very accurately is proposed in this thesis. This technique overcomes the problem of master slave mismatch, thus tuning the filter accurately. The mismatch minimization is done on power up on foreground while the background tuning is always operational. Once the mismatch...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Oscillators and phase locked loops for space radiation environments

OP-AMP free SC biquad LPF and delta-sigma ADC

Noise optimization for low-voltage CMOS audio preamplifier systems

Low voltage techniques for pipelined analog-to-digital converters

Investigation of a noise-shaping accelerometer interface circuit for two-chip implementation

High-speed switched-capacitor filters based on unity-gain buffers

High-speed CMOS dual-modulus presalers for frequency synthesis

Generalized radix design techniques for low-power, low voltage pipelined and cyclic analog-digital converters

Fast opamp-free delta sigma modulator

Error canceling low voltage SAR-ADC

Digital implementation of a mismatch-shaping successive-approximation ADC

Design techniques for radiation hardened-phase locked loops

Design of high-performance pipeline analog-to-digital converters in low-voltage processes

Design of high efficiency step-down switched capacitor DC/DC converter

Comparison of time-domain and frequency-domain phase noise analyses

Characterization of a digital phase locked loop and a stochastic time to digital converter

Area efficient D/A converters for accurate DC operation

Area efficiency improvement of CMOS charge pump circuits

An efficient switched capacitor buck-boost voltage regulator using delta-sigma control loop

Accurately tunable low-voltage continuous-time filters

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