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Fully-Differential Frequency Filters with Modern Active Elements
Langhammer, Lukáš ; Dostál, Tomáš (oponent) ; Štork, Milan (oponent) ; Jeřábek, Jan (vedoucí práce)
This doctoral thesis focuses on research in the field of frequency filters. The main goal is to propose and analyze fully-differential current-mode frequency filters employing modern active elements. Presented filters are proposed using current followers, operational transconductance amplifiers, digitally adjustable current amplifiers and transresistance amplifiers. The proposal is focusing on ability to control some of the typical filter parameter or parameters using controllable active elements suitably placed in the circuit structure. Individual presented filters are proposed in their single-ended and fully-differential forms. Great emphasis is paid to a comparison of the fully-differential structures and their corresponding single-ended forms. The functionality of each proposal is verified by simulations and in some cases also by experimental measurements.
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Electronically Configurable Transfer Structures
Langhammer, Lukáš ; Hospodka, Jiří (oponent) ; Vávra, Jiří (oponent) ; Šotner, Roman (vedoucí práce)
The thesis is focused on the development and research in the field of electronically configurable transfer structures. The main goal is to design these structures using modern electronically adjustable active elements. The work presents a number of reconnection–less reconfigurable filtering structures, which were created with help of various design methods. Emphasis is also placed on the ability to control some of the typical filter parameters using controllable active elements. Furthermore, the work contains several topological circuit designs of active elements or building blocks with specifically implemented electronic controllability, so that these elements/blocks can be further used for the design of reconnection–less reconfigurable filters. The correctness of the design of individual proposed circuits is supported by PSpice and Cadence simulations with transistor–level models. Selected solutions are further implemented using available active elements and subjected to experimental measurements.
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Electronically Configurable Transfer Structures
Langhammer, Lukáš ; Hospodka, Jiří (oponent) ; Vávra, Jiří (oponent) ; Šotner, Roman (vedoucí práce)
The thesis is focused on the development and research in the field of electronically configurable transfer structures. The main goal is to design these structures using modern electronically adjustable active elements. The work presents a number of reconnection–less reconfigurable filtering structures, which were created with help of various design methods. Emphasis is also placed on the ability to control some of the typical filter parameters using controllable active elements. Furthermore, the work contains several topological circuit designs of active elements or building blocks with specifically implemented electronic controllability, so that these elements/blocks can be further used for the design of reconnection–less reconfigurable filters. The correctness of the design of individual proposed circuits is supported by PSpice and Cadence simulations with transistor–level models. Selected solutions are further implemented using available active elements and subjected to experimental measurements.
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Fully-Differential Frequency Filters with Modern Active Elements
Langhammer, Lukáš ; Dostál, Tomáš (oponent) ; Štork, Milan (oponent) ; Jeřábek, Jan (vedoucí práce)
This doctoral thesis focuses on research in the field of frequency filters. The main goal is to propose and analyze fully-differential current-mode frequency filters employing modern active elements. Presented filters are proposed using current followers, operational transconductance amplifiers, digitally adjustable current amplifiers and transresistance amplifiers. The proposal is focusing on ability to control some of the typical filter parameter or parameters using controllable active elements suitably placed in the circuit structure. Individual presented filters are proposed in their single-ended and fully-differential forms. Great emphasis is paid to a comparison of the fully-differential structures and their corresponding single-ended forms. The functionality of each proposal is verified by simulations and in some cases also by experimental measurements.
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