Browsing by Author "Parten, Michael E."
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Item A sigma-delta DC-DC converter(2007-12) Schulmeyer, Kyle; Chao, Kwong S.; Parten, Michael E.A switching DC-DC converter is proposed that uses a Sigma-Delta Modulator (SDM) in place of the usual Pulse Width Modulator (PWM). One type of control method, voltage mode control used for switching regulators involves sensing the output voltage to servo the loop to regulate the output. Voltage mode control has inherently bad line response, which is the ability to filter out changes on the input so they don’t reach the output. The typical method to improve this response can put more noise on the output when a steady state ripple is present. The proposed architecture provides an advantage over a PWM based converter in that it does not put as many harmonics in the low frequency range when steady state ripple is present on the input.Item AC measurements using a built in self test(2006-12) Nesty, Arthur N.; Parten, Michael E.; Nutter, Brian; Cox, Ronald H.Microprocessors are designed in order to interface with other processors or components at speeds that are constantly increasing. This speed increase is a desired effect in the semiconductor industry, as it opens the world to more computing power within compact technologies, including cell phones, gaming systems and super computers. The implementation of these technologies is desired by consumers, as they give quick access to information. However, this poses specific problems to suppliers of these Integrated Circuits. In order for these microprocessors to be of any use to the consumers, they must fall within the bounds of desired specifications that will best describe their behavior. The ability to guarantee these specifications for every device before being introduced into the market becomes difficult and expensive at the speeds desired at present and in the future.Item Automated bench setup for testing H-bridges(2007-12) Shankarasubrahmanyam, Vivek; Parten, Michael E.; Nutter, Brian; Gale, Richard O.Characterization is an important step before integrated circuits are produced for sale. Characterizing is expensive and time consuming. This paper analyzes the methods of characterizing and proposes an alternate solution that is not as expensive as testing on an ATE and is very fast when compared to characterizing on a bench setup. The solution involves automating the testing procedure on a bench setup. The programming to control the instruments is accomplished in LabVIEW. The data from the tests are analyzed for repeatability. A cost estimate is also developed to aid in determining the ideal testing method for different requirements.Item Automated bench setup to characterize and test integrated circuits efficiently(Texas Tech University, 2006-09) Ledbetter, Christopher M.; Parten, Michael E.; Cox, Ronald H.Discusses the importance of testing of integrated circuits and different testing techniques. The creation of the automated bench test setup is shown and the process to create on discussed. A specific part is picked to demonstrate an automated bench tester. The test setup, generation of the test signals, the programs required to automate the equipment, and the results are presented. LabVIEW is used to control and automate the test setup. It is an excellent at collecting, processing, and sending data.Item Automated bench setup to characterize and test integrated circuits efficiently(Texas Tech University, 2005-12) Ledbetter, Christopher Michael; Parten, Michael E.; Cox, Ronald H.Discusses the importance of testing of integrated circuits and different testing techniques. The creation of the automated bench test setup is shown and the process to create on discussed. A specific part is picked to demonstrate an automated bench tester. The test setup, generation of the test signals, the programs required to automate the equipment, and the results are presented. LabVIEW is used to control and automate the test setup. It is an excellent at collecting, processing, and sending data.Item Automation of testing for current limits and serial peripheral interfaces with 10ns timing resolution(2005-08) Kuper, Jared; Parten, Michael E.; Cox, Ronald H.Conventional bench testing can be a costly and slow method of validating a device. Complications from test setups and changes in equipment can also contribute to frustrations. Automation of this process can increase the capacity of the testing lab as well as decrease mistakes and costs. It is hoped that a simple testing procedure can be automated in order to lower the effects of testing mistakes and eliminate the need for changes in equipment. LabVIEW is an excellent way to collect, process, and send data while another system will be needed for a high-speed chip interface.Item Automation of testing for current limits and serial peripheral interfaces with 10ns timing resolution(Texas Tech University, 2005-08) Kuper, Jared; Parten, Michael E.; Cox, Ronald H.Conventional bench testing can be a costly and slow method of validating a device. Complications from test setups and changes in equipment can also contribute to frustrations. Automation of this process can increase the capacity of the testing lab as well as decrease mistakes and costs. It is hoped that a simple testing procedure can be automated in order to lower the effects of testing mistakes and eliminate the need for changes in equipment. LabVIEW is an excellent way to collect, process, and send data while another system will be needed for a high-speed chip interface.Item Capabilities of a low cost tester for testing digital video decoders(Texas Tech University, 2005-08) Syrus, Andrew; Parten, Michael E.; Cox, Ronald H.As the semiconductor industry continues to grow and advance, the cost of testing is also steadily growing. Mixed signal devices can especially difficult to test because of their both analog and digital nature. Digital video decoders are such a device. This thesis examines the capabilities of a low cost tester for testing these types of devices.Item Capabilities of a low cost tester for testing digital video decoders(2005-08) Syrus, Andrew; Parten, Michael E.; Cox, Ronald H.As the semiconductor industry continues to grow and advance, the cost of testing is also steadily growing. Mixed signal devices can especially difficult to test because of their both analog and digital nature. Digital video decoders are such a device. This thesis examines the capabilities of a low cost tester for testing these types of devices.Item Computer simulations of a hydrogen fueled internal combustion engine(Texas Tech University, 2005-05) Halmari, Jaakko J.; Maxwell, Timothy T.; Parten, Michael E.; Ertas, AtilaRicardo WAVE was used to simulate the hydrogen internal combustion engine used in Texas Tech University’s FutureTruck Ford Explorer. Initially, a naturally aspirated gasoline engine was simulated, followed by the supercharged hydrogen engine. The objective of these simulations was to maximize power of the hydrogen engine, while minimizing the emissions and fuel consumption. Among the variables which were changed, were the equivalence ratio, compression ratio, throttle opening, camshaft timing, and exhaust size. The simulation results studied included the volumetric efficiency, fuel consumption, as well as NO emissions. Several results were compared to the gasoline baseline model.Item Computer simulations of a hydrogen fueled internal combustion engine(2005-05) Halmari, Jaakko Jalmari; Maxwell, Timothy T.; Parten, Michael E.; Ertas, AtilaRicardo WAVE was used to simulate the hydrogen internal combustion engine used in Texas Tech University’s FutureTruck Ford Explorer. Initially, a naturally aspirated gasoline engine was simulated, followed by the supercharged hydrogen engine. The objective of these simulations was to maximize power of the hydrogen engine, while minimizing the emissions and fuel consumption. Among the variables which were changed, were the equivalence ratio, compression ratio, throttle opening, camshaft timing, and exhaust size. The simulation results studied included the volumetric efficiency, fuel consumption, as well as NO emissions. Several results were compared to the gasoline baseline model.Item Design of an ASIC chip for a Controller Area Network (CAN) protocol controller(Texas Tech University, 2006-08) Krishnamoorthy, S.; Bredeson, Jon G.; Parten, Michael E.This thesis describes the design, simulation and ASIC implementation of a protocol controller for the Controller Area Network (CAN) 2.0A multi-master serial communication protocol. The CAN Controller designed will function as the interface between an application and the actual CAN bus. The RTL based design is implemented using Verilog HDL. Physical realizations of the design are obtained with Magma tools. Logic Equivalence is verified using Cadence Verplex. Simulations are made at each level to verify the implementations. The system was implemented in TSMC 0.13ìm CMOS six metal process.Item Development and validation of a hybrid electric vehicle with hydrogen internal combustion engine(Texas Tech University, 2006-05) He, Xiaolai; Parten, Michael E.; Nutter, Brian; Bredeson, Jon G.; Maxwell, Timothy T.The motivation for the use of hydrogen as fuel is that it is renewable and can reduce emissions. Hydrogen fuel cell vehicles are still likely to be more of a far-term reality because of their high manufacturing cost. A hybrid electric vehicle (HEV) with a hydrogen fueled internal combustion (IC) engine has the potential to provide a low-emission, low-cost, practical solution in the near future. A standard SUV has been converted into a hydrogen powered HEV. The powertrain utilizes compressed gaseous hydrogen as fuel, a boosted hydrogen IC engine, an induction motor, a hydraulic transmission, regenerative braking, advanced Nickel Metal Hybrid (NiMH) batteries, and a real-time control system. Tests show that the vehicle can deliver higher fuel economy and much lower emissions than those of a traditional SUV without compromise to performance. This dissertation presents an overview of the prototype vehicle and emphasizes some of the unique features of this energy-saving, clean environment solution. Validation plays an important role in the software development, as it provides users the degree of accuracy of the software. Modeling tools could be validated using the data sources of vehicle testing. The testing data will be used for the comparison of model results and test data. However, not much work has been conducted to validate the modeling tools by other research work. This dissertation validates the modeling tools by the testing results of the hydrogen HEV.Item Development and validation of a hybrid electric vehicle with hydrogen internal combustion engine(2006-05) He, Xiaolai; Parten, Michael E.; Bredeson, Jon G.; Nutter, Brian; Maxwell, Timothy T.The motivation for the use of hydrogen as fuel is that it is renewable and can reduce emissions. Hydrogen fuel cell vehicles are still likely to be more of a far-term reality because of their high manufacturing cost. A hybrid electric vehicle (HEV) with a hydrogen fueled internal combustion (IC) engine has the potential to provide a low-emission, low-cost, practical solution in the near future. A standard SUV has been converted into a hydrogen powered HEV. The powertrain utilizes compressed gaseous hydrogen as fuel, a boosted hydrogen IC engine, an induction motor, a hydraulic transmission, regenerative braking, advanced Nickel Metal Hybrid (NiMH) batteries, and a real-time control system. Tests show that the vehicle can deliver higher fuel economy and much lower emissions than those of a traditional SUV without compromise to performance. This dissertation presents an overview of the prototype vehicle and emphasizes some of the unique features of this energy-saving, clean environment solution. Validation plays an important role in the software development, as it provides users the degree of accuracy of the software. Modeling tools could be validated using the data sources of vehicle testing. The testing data will be used for the comparison of model results and test data. However, not much work has been conducted to validate the modeling tools by other research work. This dissertation validates the modeling tools by the testing results of the hydrogen HEV.Item Digital jitter measurement and separation(2005-08) McClure, Mark Scott; Parten, Michael E.; Nutter, BrianThis thesis examines a method of measuring jitter and separating the random and deterministic components without the use of overly expensive jitter measurement or analysis equipment. Relatively inexpensive, on-hand equipment is used to achieve this objective. Period measurements were made on an Agilent Infiniium oscilloscope and recorded by a PC. The data was post processed in MATLAB, and a histogram tail-fitting algorithm measured and separated the deterministic and random jitter.Item Digital jitter measurement and separation(Texas Tech University, 2005-08) McClure, Mark Scott; Parten, Michael E.; Nutter, BrianThis thesis examines a method of measuring jitter and separating the random and deterministic components without the use of overly expensive jitter measurement or analysis equipment. Relatively inexpensive, on-hand equipment is used to achieve this objective. Period measurements were made on an Agilent Infiniium oscilloscope and recorded by a PC. The data was post processed in MATLAB, and a histogram tail-fitting algorithm measured and separated the deterministic and random jitter.Item Direct digital frequency synthesizer(2007-05) Shrimali, Shashikant; Bredeson, Jon G.; Parten, Michael E.A frequency synthesizer is an electronic system for generating any of a range of frequencies from a single fixed timebase or oscillator. They are found in many modern devices, including radio receivers, mobile telephones, radiotelephones, walkie-talkies, CB radios, satellite receivers, GPS systems, etc. Direct Digital Synthesis (DDS) is a kind of frequency synthesizer that uses electronic method for digitally creating arbitrary waveforms and frequencies from a single, fixed source frequency. Direct Digital Frequency Synthesis (DDFS) is a mixed signal part i.e. it has both digital and analog parts. DDFSs digital part is also known as Numerically Controlled Oscillator (NCO), which consists of Phase Register, Phase Accumulator (PA) and ROM. Analog part has Digital-to-Analog Converter and a filter. NCO is a digital computing block which renders digital word sequences in time at a given reference clock frequency , which thereafter are converted into analog signals to serve as a synthesizer. The phase accumulator (PA) clocked with , generates the phase value sequence. Application of DDFS ranges from instrumentation to modern communication systems, which employs spread-spectrum and phase shift-keying modulation techniques. The focus of this thesis is on design, analysis and simulation of DDFS, using tools like Xilinx and Cadence. Traditional designs of high bandwidth frequency synthesizers employ the use of a phase locked- loop (PLL). DDFS provides many significant advantages over the PLL approaches, such as, fast settling time, sub-Hertz frequency resolution, continuous-phase switching response and low phase noise.Item High performance class-D amplifiers(Texas Tech University, 2007-05) Trehan, Chintan; Chao, Kwong S.; Nutter, Brian; Giesselmann, Michael G.; Parten, Michael E.; Mitra, SunandaOwing to its high efficiency, class-D amplifiers play important roles in audio applications. The main focus of this dissertation is to propose a high performance digital input class-D amplifier Integrated Circuit (IC) that satisfies following criteria: 1.Linearity of the output signal in the audio band to avoid harmonic distortion. 2.High timing accuracy for the switching-points of the pulses to give a precise representation of the input level in the mean value of the pulses. 3.Stable power supply for the switching levels. Variations in the switching levels lead to distortions and further modulation products. 4.Sharp edges to create a nearly ideal rectangular form of the pulses. 5.Feedback from the output to cancel errors produced by the power circuitry. 6.Reduced electromagnetic interference. Three different architectures of class-D amplifier have been proposed as the part of this work, and their theoretical verification is done by system-level simulations. The output stage in all of them is driven by Sigma-Delta Modulation (SDM). The first one consists of a delay-line analog-to-digital converter in the feedback. The second architecture achieves the feedback using continuous-time SDM. The third structure does not employ the feedback but suppresses the noise using multi-level output stage. System-level simulations are carried out using MATLAB and SIMULINK. The structures are then taken through the schematic design and layout using the CADENCE design suite. The first design is fabricated through the MOSIS design foundry. The fabricated device is then tested using custom made test PCB and the results of the testing are analyzed.Item Linear network analysis by Nullator-Norator residual networks(Texas Tech University, 1972-05) Parten, Michael E..Item Low cost alternating current automated characterization system for operational amplifiers(Texas Tech University, 2005-05) Gulas, Scott Matthew; Parten, Michael E.; Cox, RonaldThe purpose of this thesis project was to develop a low-cost automated bench test solution capable of measuring AC (alternating-current) parameters on single and dual packaged voltage-feedback operational amplifiers (op-amps). Electrical properties of the device under test (DUT) are described, along with the methodology used to test these parameters. The design and implementation of the test hardware is covered. A detailed explanation of the test software developed is also included. Finally, a statistical analysis is used to verify that the system is repeatable and accurate in relationship to data taken manually in a bench setup.