Index Catalog // ScholarsArchive@OSU

Highly-Integrated Low-Power RF Receivers for Distributed Sensing and IoT Devices

Creator:: Bialek, Hayden
Abstract:: Low-power receivers (RX) with 100$\mu W$-scale power consumption can enable several power/energy-constrained IoT applications. However, achieving sensitivity, interferer tolerance and wide operating range with low power presents a challenge for existing architectures, particularly those constrained to highly integrated solutions without high-Q off-chip components. Existing solutions rely heavily on high quality...
Resource Type:: Dissertation

CMOS Transducers and Programmable Interface Circuits for Resource-Efficient Sensing Applications

Creator:: Sengupta, Shaan
Abstract:: Modern sensors are complex systems comprising multiple sub-systems such as transducers, analog and mixed-signal interface circuits, digital processing circuits, and packaging. Over the last few decades, innovations in these sub-systems combined with their increased integration in complementary metal-oxide semiconductor (CMOS) processes have led to the rapid growth in sensors for...
Resource Type:: Dissertation

New Techniques for Multi-Channel Biosignal Acquisition and Low-Power, Low-Resistance-Measurement Systems

Creator:: Kim, Jinyong
Abstract:: Dense electrical recording of biosignals has been developed to provide spatial resolution and precise temporal information for health monitoring, diagnostics, and clinical research. However, more electrodes require more wires, and wiring density quickly becomes a limiting factor. To break this bottleneck, we proposed a frequency-division multiplexing (FDM) based architecture for...
Resource Type:: Dissertation

RF and Millimeter-wave Techniques to Improve Scalability and Efficiency of Digital Beamforming Arrays

Creator:: Johnson, Manoj
Abstract:: Spectrum overcrowding, ever increasing demand for high data rate and increased mobility requirements are three major challenges 5G-technology is trying to address. In this thesis I start with a RF front-end technique that deals with blocker interference arising from spectrum overcrowding both across frequency bands and within the same frequency...
Resource Type:: Dissertation

A Wireless Energy Harvester for Powering Event-driven Internet-of-things Applications and Battery Charging

Creator:: Sadagopan, Kamala Raghavan
Abstract:: The need for sustainably powering unobtrusive internet-of-things applications has led to an interest in energy harvesting. Particularly, the proliferation of wireless communication and devices in the 2.4 GHz Industrial Scientificc Medical (ISM) band creates an opportunity to leverage commonly used devices for RF powering. This dissertation presents a low-quiescent-power...
Resource Type:: Dissertation

Design of Energy-Efficient Equalization and Data Encoding/Decoding Techniques for Wireline Communication Systems

Creator:: Chun, Yu Sang
Abstract:: Ever increasing global internet data traﬃc has driven up the demand for cutting-edge high-speed wireline communication systems including SerDes PHY for various interfaces, interconnects, data centers servers and switches in optical systems. Operating wireline communications at higher data rates leads to signals suﬀering from greater channel loss and exponential increase...
Resource Type:: Dissertation

New Architectures and Circuits for Pushing the Dynamic Range and Multiplexing Boundaries of CMOS-Integrated Sensors

Creator:: Ouh, Hyunkyu
Abstract:: Over the last decades, CMOS-integrated sensors have made impressive progress in performance, form-factor, and energy-efficiency for various applications such as imaging, physical/chemical sensing, bio/health monitoring. In the era of the artificial intelligence (AI) and the internet-of-things (IoT), such CMOS-integrated sensors are essential for massive and comprehensive data acquisition, where sensing...
Resource Type:: Dissertation

Digital Friendly Continuous-Time Delta-Sigma Analog-to-Digital Converters

Creator:: Maghami, Hamidreza
Abstract:: Conventional Delta-Sigma analog-to-digital converters (ADCs) utilize operational transconductance amplifiers (OTAs) in their loop filter implementation followed by multi-bit voltage domain quantizers. As CMOS integrated circuit technology scales to smaller geometries, the minimum transistor length and the intrinsic gain of the transistors decrease. Moreover, with process scaling the voltage headroom decreases...
Resource Type:: Dissertation

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

Power Efficient Architectures for Low Noise Switched-Capacitor Filters and High Accuracy Analog-to-Digital Converters

Creator:: Payandehnia, Pedram
Abstract:: Filters and data converters are key analog-and-mixed-signal (AMS) building blocks in communication systems, such as software-deﬁned radios and internet-of-things. In this dissertation, novel switched-capacitor ﬁlter and analog-to-digital converter (ADC) circuit conﬁgurations have been explored which are power eﬃcient and are digital scaling friendly. First, a novel switched-capacitor low-pass ﬁlter architecture...
Resource Type:: Dissertation

Wirelessly Powered cm-Scale Sensor for Small Insect Localization Application

Creator:: Kang, Jian
Abstract:: The prevalence of Internet-of-Things (IoT) applications leads to an increasing focus on the design and optimization of sensor nodes. Battery lifetime and associated costs of battery replacement often limits the long term operation and viability of sensor nodes. RF wireless energy harvesting on the other hand can be appealing since...
Resource Type:: Dissertation

Scalable Array Transceivers with Wide Frequency Tuning Range for Next Generation Radios

Creator:: Agrawal, Abhishek
Abstract:: Scalable array transceivers with wide frequency tuning range are attractive for next-generationradios. Key challenges for such radios include generation of LO signals with widefrequency tuning range, scalable synchronization between multiple array unit cells andtolerance to in-band and out-of-band interferers. This thesis presents approaches toaddress these challenges in commercial CMOS technologies.The...
Resource Type:: Dissertation

A new data encoding scheme for equalization - Integrated Pulse Width Modulation (iPWM)

Creator:: Ramachandran, Ashwin
Abstract:: This work presents a new data encoding scheme: Integrated Pulse Width Modulation (iPWM) for equalizing lossy wireline channels with the aim of achieving energy efficient wireline communication. The proposed scheme is able to overcome the fundamental limitations imposed by Manchester and Pulse Width Modulation (PWM) encoding on high data rate...
Resource Type:: Masters Thesis

Design Techniques of High-Speed Silicon Photonics Transceiver

Creator:: Li, Hao
Abstract:: The rapid scaling of network bandwidth and data center throughput has motivated the wide adoption of high speed transceivers. Silicon photonics (Si-Photonic) is one of the most promising techniques to realize tightly integrated optical transceivers for next-generation high speed I O standards. This dissertation focuses on the design techniques of...
Resource Type:: Dissertation

Design of 28 GHz Low-Power Phased-Array Receiver Frontend in CMOS

Creator:: Garg, Robin
Abstract:: This work presents the design and implementation of a low power phased-array receiver frontend at 28 GHz in 65 nm CMOS. The frontend incorporates a low- power low-noise amplifier(LNA) and a passive reflection-type phase shifter (RTPS) capable of providing 360° phase shift with 5-bit phase resolution and low loss variation....
Resource Type:: Masters Thesis

High-Resolution mm-wave Digitally Controlled Oscillator in CMOS

Creator:: Wang, Yunqi
Abstract:: All-digital PLLs promise flexible and precise frequency modulation continous-wave(FMCW) radar signal signal for 77GHz radar applications. Such PLLs require digitally-controlled oscillators(DCO) with wide frequency tuning range and high resolution to address a range of applications and low phase noise requirements. In this thesis, novel resonator structures with ne capacitance/inductance switching...
Resource Type:: Masters Thesis

Wideband and high accuracy delta sigma modulation data converter

Creator:: Jung, Youngho
Abstract:: Nowadays, needs for wideband and high accuracy analog-to-digital converter are increasing rapidly in manifold applications such as wireless communication, digital video and other consumer electronics. Besides, low power consumption is required to have longer battery life in portable systems. CMOS technology scaling and innovative modulator topology make the implementation much...
Resource Type:: Dissertation

Measurement and analysis of soft error vulnerability of low-voltage logic and memory circuits

Creator:: Pawlowski, Robert
Abstract:: Scaling the supply voltage into the sub/near-threshold domain is one of the most effective methods for improving the energy efficiency of next-generation electronic microsystems. Unfortunately, the relationship between low-voltage operation and radiation-induced soft error rate is not widely known, as little research has been previously performed and reported for soft-error...
Resource Type:: Dissertation

Design techniques for low-power electrical and optical serial link receivers

Creator:: Bai, Rui
Abstract:: As computation power continues to grow, the demand for data transfer bandwidth is also rising. This is reflected in the increasing data-rate of high-speed links. However, the increase in data-rate is sustainable only if the I/O energy efficiency improves as well. This dissertation explores several techniques to enable high-speed links...
Resource Type:: Dissertation

Analysis and design on low-power short-range radios for wireless body area networks

Creator:: Cheng, Jiao
Abstract:: The release of the IEEE802.15.6 standard has led to increased interest in low-power technologies for wireless body-area-networks (WBANs). The power dissipation, supply voltage, and die area are some of the most important criteria for successful WBAN implementations. Digital-intensive RX architectures can potentially result in sub-1V operation with significant reductions in...
Resource Type:: Dissertation

Design techniques for delta sigma modulators using VCO based ADCs

Creator:: Reddy, Karthikeyan
Abstract:: VCO-based ADCs have recently emerged as attractive alternative to conventional DeltaSigma (ΔΣ) modulator architectures. Few salient features of a VCObased ADC are: 1) the quantization noise is 1st order noise shaped, 2) it is an open loop architecture, and, 3) its implementation is mostly digital in nature. Hence, they are...
Resource Type:: Dissertation

Design techniques for VCO based digital sensor readout circuits

Creator:: Prabha, Praveen
Abstract:: Sensors find a variety of applications in portable electronics, automotive and biomedical solutions. The demand for low power and high dynamic range makes the design of digital sensor readout circuits quite challenging. Traditionally, these circuits are realized using amplifiers with passive feedback or precision analog comparators which are power hungry...
Resource Type:: Masters Thesis

Micropower incremental analog-to-digital converters

Creator:: Chen, Chia-Hung
Abstract:: Incremental ADCs (IADCs) have many advantages for low-frequency high-accuracy data conversion—they are easy to multiplex between channels, need simpler digital decimation filter, and allow extended counting with a Nyquist-rate ADC. A single-loop incremental ADC was designed and fabricated in 90 nm for a biosensor interface circuit. It incorporates one integrator,...
Resource Type:: Dissertation

Design techniques for low power high speed successive approximation analog-to-digital converters

Creator:: Lin, Jiaming
Abstract:: This dissertation presents two high-speed pipeline successive approximation analog-to-digital converters (SAR ADCs). Capacitive DACs and resistive DACs are utilized in these two pipeline SAR ADCs, respectively. The pipeline SAR ADC with capacitive DACs can save 50% switching power compared with other time-interleaved SAR ADCs since the total capacitance of the...
Resource Type:: Dissertation

Time-based noise-shaping techniques for time-to-digital and analog-to-digital converters

Creator:: Young, Brian LeRoy
Abstract:: In this dissertation, time-based signal processing techniques and their applications in oversampling and noise-shaping data converters are examined. These techniques demonstrate the ability to shift the burden of high performance analog circuits from the compressed voltage-domain to the augmented time-domain. First, the potential of high order noise-shaping and phase-domain feedback...
Resource Type:: Dissertation

Linearizing techniques for voltage controlled oscillator based analog to digital converters

Creator:: Rao, Sachin B.
Abstract:: Voltage controlled oscillator (VCO) based ADC is an important class of time-domain ADC that has gained widespread acceptance due to their several desirable properties. VCO-based ADCs behave like an open-loop continuous time ΔΣ modulator and achieve excellent resolution by first order noise shaping the quantization error. However, the SNDR of...
Resource Type:: Dissertation

Multi-bit delta-sigma switched-capacitor DACs employing element-mismatch-shaping

Creator:: Lin, Haiqing
Abstract:: Delta-sigma modulators are currently a very popular technique for making high-resolution analog-to-digital and digital-to-analog converters (ADCs and DACs). Most delta-sigma modulators in production today employ single-bit quantization because a 1-bit DAC is inherently linear, whereas a multi-bit DAC is not. Were it not for this drawback, the use of multi-bit...
Resource Type:: Dissertation

Analysis and measurement of charge injection in switched-capacitor circuits

Creator:: Shen, Min
Abstract:: It has been verified by theoretical analysis, circuit simulation and test that two switch transistors in parallel in a simple sample and hold circuit can be achieve high speed with low error voltage due to charge injection. The wide transistor provides low RC time constant when it is closed and...
Resource Type:: Masters Thesis

Lowpass and bandpass current-mode delta-sigma DACs employing mismatch-shaping

Creator:: Shui, Tao, 1969-
Abstract:: Delta-sigma modulators are currently a very popular technique for making high-resolution analog-to-digital converters (ADCs) and digital-to-analog converters (DACs). These oversampled data converters have several advantages over conventional Nyquist-rate converters, including an insensitivity to many analog component imperfections, a simpler antialiasing filter and reduced accuracy requirements in the sample and hold....
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

Compensation techniques for cascaded delta-sigma A/D converters and high-performance switched-capacitor circuits

Creator:: Sun, Tao
Abstract:: This thesis describes compensation techniques for cascaded delta-sigma A/D converters (ADCs) and high-performance switched-capacitor (SC) circuits. Various correlated-double-sampling (CDS) techniques are presented to reduce the effects of the nonidealities, such as clock feedthrough, charge injection, opamp input-referred noise and offset, and finite opamp gain, in SC circuits. A CDS technique...
Resource Type:: Dissertation

A performance study of multithreading

Creator:: Kwak, Hantak
Abstract:: As the performance gap between processor and memory grows, memory latency will be a major bottleneck in achieving high processor utilization. Multithreading has emerged as one of the most promising and exciting techniques used to tolerate memory latency by exploiting thread-level parallelism. The question however remains as to how effective...
Resource Type:: Dissertation

High-accuracy circuits for on-chip capacitor ratio testing and sensor readout

Creator:: Wang, Bo, 1970-
Abstract:: The precise measurement of a capacitance difference or ratio in a digital form is very important for capacitive sensors, for CMOS process characterization as well as for the realization of precise switched-capacitor data converters, amplifiers and other circuits utilizing ratioed capacitors. This thesis introduces design techniques for on-chip capacitor ratio...
Resource Type:: Dissertation

Optimum equalization and synchronization of broadband multicarrier systems

Creator:: Lashkarian, Navid
Abstract:: The application of information theory and digital signal processing techniques to digital communication has resulted in robust methods for reliable high speed data transmission over noisy channels environments. Among these methods, multicarrier systems have become a viable solution for exploiting maximum spectral efficiency over both wideband highly dispersive static and...
Resource Type:: Dissertation

Adaptive dual-loop algorithm for cancellation of time-varying offsets in direct conversion mixers

Creator:: Holenstein, Christian
Abstract:: The thesis presents a new algorithm and structure that is to be used in conjunction with a specially modified CMOS Gilbert cell mixer to remove time-varying DC offsets in direct conversion receivers. In our approach, the DC offset is detected at the output of the mixer using a dedicated coarse...
Resource Type:: Masters Thesis

Design of a 1.8-V 14-bit [delta] - [sigma] A/D converter with 8X oversampling and 4 MHz Nyquist output rate

Creator:: Jiang, Ruoxin
Abstract:: In this dissertation, a new Δ∑ A/D converter is presented that is ideally suited for communication applications. It is based on a single-loop single-stage structure, which can realize a high maximum out-of-band quantization noise gain while maintaining stable operation and thus achieve 14-bit resolution at 8 times oversampling. A fifth-order...
Resource Type:: Dissertation

Performance enhancement techniques for low power digital phase locked loops

Creator:: Elshazly, Amr
Abstract:: Desire for low-power, high performance computing has been at core of the symbiotic union between digital circuits and CMOS scaling. While digital circuit performance improves with device scaling, analog circuits have not gained these benefits. As a result, it has become necessary to leverage increased digital circuit performance to mitigate...
Resource Type:: Dissertation

The design of delta-sigma modulators for multi-standard RF receivers

Creator:: Liu, Mingliang
Abstract:: The transition from second-generation (2G) to third-generation (3G) wireless cellular and cordless telephone systems requires multi-standard adaptability in a single RF receiver equipment. An important answer to this request is the use of Delta-Sigma modulators for IF-to-baseband conversion, which will satisfy the dynamic range requirements for digital signal processing, and...
Resource Type:: Masters Thesis

Digitally assisted control techniques for high performance switching DC-DC converters

Creator:: Khan, Qadeer Ahmad
Abstract:: Digitally controlled switching DC-DC converters have recently emerged as an attractive alternative to conventional switching converters based on analog control techniques. This research focuses on eliminating the issues associated with the state of the art switching converters by proposing three novel control techniques: (1) a digitally controlled Buck-Boost converter uses...
Resource Type:: Dissertation

Steady-state analysis techniques for coupled device and circuit simulation

Creator:: Hu, Yutao
Abstract:: The focus of this work is on the steady-state analysis of RE circuits using a coupled device and circuit simulator. Efficient coupling algorithms for both the time-domain shooting method and the frequency-domain harmonic balance method have been developed. A modified Newton shooting method considerably improves the efficiency and reliability of...
Resource Type:: Dissertation

Low-power high-linearity digital-to-analog converters

Creator:: Kuo, Ming-Hung
Abstract:: In this thesis work, a design of 14-bit, 20MS/s segmented digital-to-analog converter (DAC) is presented. The segmented DAC uses switched-capacitor configuration to implement 8 (LSB) + 6 (MSB) segmented architecture to achieve high performance for minimum area. The implemented LSB DAC is based on quasi-passive pipelined DAC that has been...
Resource Type:: Masters Thesis

Highly digital power efficient techniques for serial links

Creator:: Inti, Rajesh
Abstract:: Low power, high speed serial transceivers are employed in a wide range of applications ranging from chip-to-chip, backplane, and optical interconnects. Apart from being capable of handling a wide range of data rates, the transceivers should have low power consumption (mW/Gbps) and be fully integrated. This work discusses enabling techniques...
Resource Type:: Dissertation

A digital multiplying delay locked loop for high frequency clock generation

Creator:: Uttarwar, Tushar
Abstract:: As Moore’s Law continues to give rise to ever shrinking channel lengths, circuits are becoming more digital and ever increasingly faster. Generating high frequency clocks in such scaled processes is becoming a tough challenge. Digital phase locked loops (DPLLs) are being explored as an alternative to conventional analog PLLs but...
Resource Type:: Masters Thesis

Design techniques for successive approximation register analog-to-digital converters

Creator:: Tong, Tao
Abstract:: Successive approximation register analog-to-digital converters (SAR ADCs) have been widely used for medium-speed, medium-resolution applications due to their excellent power efficiency and digital compatibility. Recently, SAR ADCs are also penetrating into the applications which have been earlier dominated by delta-sigma ADCs and pipeline ADCs. However, the resolution of SAR ADCs...
Resource Type:: Masters Thesis

Design and analysis techniques for nano-joule ADCs and sampling linearity

Creator:: Brown, Thomas (Thomas William)
Abstract:: Two aspects of ADC system performance are addressed in this work. First, the combination of the ADC and its associated reference are co-designed for an energy constrained remote sensing system. Second, sampling linearity is mathematically analyzed as a function of frequency to provide enhanced understanding into an ADC's requisite sampling...
Resource Type:: Dissertation

Time-based analog signal processing

Creator:: Drost, Brian George
Abstract:: As CMOS processes size continues to shrink, a number of factors limit the ability of analog circuit performance to scale with the process. These issues include smaller transistor intrinsic gains and lower supply voltages. However, scaling continues to increase the speed and decrease the power of digital circuits. In this...
Resource Type:: Masters Thesis

Design techniques for high-performance digital PLLs and CDRs

Creator:: Yin, Wenjing
Abstract:: Phase-Locked Loops (PLLs) are essential building blocks in many communication systems. Designing high performance analog PLLs in the presence of technology imposed constraints such as leakage, poor analog transistor behavior, process variability, and low supply voltage is a challenging task. To overcome these drawbacks, digital PLLs (DPLLs) have recently emerged...
Resource Type:: Dissertation

Low-power double-sampled delta-sigma modulator for broadband applications

Creator:: Shen, Weilun
Abstract:: High speed and high resolution analog-to-digital converter is a key building block for broadband wireless communications, high definition video applications, medical images and so on. By leveraging the down scaling of the latest CMOS technology and the noise shaping properties, delta-sigma (ΔΣ) ADCs are able to achieve wide-band operation and...
Resource Type:: Dissertation

Low-power techniques for supply-noise mitigation in phase-locked loops

Creator:: Arakali, Abhijith
Abstract:: Modern day digital systems employ frequency synthesizers to provide a common clock to the system. They are undergoing large scale integration due to which, mitigation of the effect of noise on power supply has become a major design consideration in clocking circuits. Rapid scaling of CMOS technology mandates the design...
Resource Type:: Dissertation

Design techniques for high efficiency LED drivers

Creator:: Bang, Sarvesh Jagdish
Abstract:: The increasing popularity of cellular phones with integrated cameras in the recent past has led to major improvements in its image quality. However, integration of new features, such as mobile email, video streaming, MP3 etc. tend to put the limitation on image quality as camera phone designers struggle to manage...
Resource Type:: Masters Thesis

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