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Injection locked ring oscillator design for application in Direct Time of Flight LIDAR
Fránek, Jakub ; Háze, Jiří (oponent) ; Kledrowetz, Vilém (vedoucí práce)
The diploma thesis provides an introduction to Direct Time of Flight LIDAR systems and Time to Digital Converters used in these systems. It discusses the problem of clock distribution in LIDAR Time to Digital Converter arrays, and examines one of the possible solutions to this problem based on injection locked oscillators. The injection locking phenomenon is thoroughly mathematically described and a Matlab model of an injection locked ring oscillator is presented, confirming the analytic predictions. In ONK65 processing technology, an injection locked ring oscillator biased by a delay locked loop meant specifically for application in Time to Digital Converters for LIDAR systems has been designed. The designed oscillator has been verified by computer simulations taking process, voltage and temperature variations into account and offers specified time resolution of 50 picosecond as well as two times less clock jitter than an equivalent free-running oscillator in the given processing technology.
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Ultrasonic flow measurement
Mikan, Lukáš ; Boušek, Jaroslav (oponent) ; Šteffan, Pavel (vedoucí práce)
This work deals with ultrasonic flow meters which represent a very viable alternative to conventional mechanical solutions. The first part gives an overview of the gas metering industry, different types of gas meters are presented with emphasis on how they compare to the ultrasonic approach. Then, the physics that go into ultrasonic flow measurement are explained. In particular, the Transit Time method is explored which utilizes the time of flight of an ultrasonic signal to calculate the velocity of gas in a pipe. In the second part, a simple functional model is implemented with three ultrasonic paths. This model can measure gas velocity, flow rate, and accumulated volume. It emulates the industry-standard pulse output in order to communicate the volume. The technical solution is based on AS6040 which is a dedicated SoC for ultrasonic flow meters of the Transit Time kind. Presented are the various features of AS6040, the algorithmic measurement system, and key issues faced during development. The functional model is then brought to a sonic nozzle test bench. The third part of this work analyzes the obtained data.
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Injection locked ring oscillator design for application in Direct Time of Flight LIDAR
Fránek, Jakub ; Háze, Jiří (oponent) ; Kledrowetz, Vilém (vedoucí práce)
The diploma thesis provides an introduction to Direct Time of Flight LIDAR systems and Time to Digital Converters used in these systems. It discusses the problem of clock distribution in LIDAR Time to Digital Converter arrays, and examines one of the possible solutions to this problem based on injection locked oscillators. The injection locking phenomenon is thoroughly mathematically described and a Matlab model of an injection locked ring oscillator is presented, confirming the analytic predictions. In ONK65 processing technology, an injection locked ring oscillator biased by a delay locked loop meant specifically for application in Time to Digital Converters for LIDAR systems has been designed. The designed oscillator has been verified by computer simulations taking process, voltage and temperature variations into account and offers specified time resolution of 50 picosecond as well as two times less clock jitter than an equivalent free-running oscillator in the given processing technology.
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