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Electronically tunable oscillators
Polanský, David ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The goal of bacheolor’s project introduce the reader to the basic principles of oscillator with a possibility of coherent electrical tunning frequency. Project is focused on utilization of non-standard active elements like OTA and CCII. A few wiring circuits are listed, in which it's tunning scale is calculated in PSpise program. Next these devices are compared.
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ARC oscillator with blocks with variable parameter
Bořecký, Tomáš ; Kolka, Zdeněk (referee) ; Slezák, Josef (advisor)
Within the master’s thesis there is comparison of different structures of ARC oscillators with respect to their harmonic distortion. Individual blocks of oscillator are analyzed. Attention is paid to choosing and design of suitable ARC filter structure and possibilities of its tuning. Also possibilities of stabilization of amplitude are analyzed. Different types of controlled amplifiers and circuits for controlling of their amplification are discussed. Next captures are focused to designing and simulation of the ARC oscillator. The oscillator can be tuned in the frequency range from 100 Hz to 20 kHz with harmonic distortion smaller than 1%. At the end of the thesis, practical realization of the proposed circuit is described. Also results of the measurement of parameters of the oscillator are given.
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Network with capacitor microphone using FM modulation
Lapáček, Petr ; Říha, Kamil (referee) ; Káňa, Ladislav (advisor)
In bachelor's thesis I was interested in quality of the electrostatic transducer. I have described a theoretic pieces of knowledges in parts of FM modulations and the variables crystals oscillators. I have tried to propose a conception of the condenser mikrophone in the high-frequency circuit where one of the main part was the crystal oscillator, which part was the capacitor transducer, in capacity element representative uncertain capacities. By this way I have tried to create the modulator, whose modulation depend on the actual changes of capacities in the electrostatic changers. Finally I have interested in the demodulation in this way of creating the HF signal by the help of detection unit TDA7000 and likewise setup of integrated circuit.
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Network with capacitor microphone using FM modulation
Lapáček, Petr ; Říha, Kamil (referee) ; Káňa, Ladislav (advisor)
In bachelor's thesis I was interested in quality of the electrostatic transducer. I have described a theoretic pieces of knowledges in parts of FM modulations and the variables crystals oscillators. I have tried to propose a conception of the condenser mikrophone in the high-frequency circuit where one of the main part was the crystal oscillator, which part was the capacitor transducer, in capacity element representative uncertain capacities. By this way I have tried to create the modulator, whose modulation depend on the actual changes of capacities in the electrostatic changers. Finally I have interested in the demodulation in this way of creating the HF signal by the help of detection unit TDA7000 and likewise setup of integrated circuit.
|
|
|
Electronically tunable oscillators
Polanský, David ; Šotner, Roman (referee) ; Petržela, Jiří (advisor)
The goal of bacheolor’s project introduce the reader to the basic principles of oscillator with a possibility of coherent electrical tunning frequency. Project is focused on utilization of non-standard active elements like OTA and CCII. A few wiring circuits are listed, in which it's tunning scale is calculated in PSpise program. Next these devices are compared.
|
|
|
ARC oscillator with blocks with variable parameter
Bořecký, Tomáš ; Kolka, Zdeněk (referee) ; Slezák, Josef (advisor)
Within the master’s thesis there is comparison of different structures of ARC oscillators with respect to their harmonic distortion. Individual blocks of oscillator are analyzed. Attention is paid to choosing and design of suitable ARC filter structure and possibilities of its tuning. Also possibilities of stabilization of amplitude are analyzed. Different types of controlled amplifiers and circuits for controlling of their amplification are discussed. Next captures are focused to designing and simulation of the ARC oscillator. The oscillator can be tuned in the frequency range from 100 Hz to 20 kHz with harmonic distortion smaller than 1%. At the end of the thesis, practical realization of the proposed circuit is described. Also results of the measurement of parameters of the oscillator are given.
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