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Low Noise Amplifiers for frequency range 1-3 GHz
Klegová, Hana ; Zamazal, Michal (referee) ; Kasal, Miroslav (advisor)
This masters thesis deals with low noise amplifier design for frequency range 1 GHz - 3 GHz. There is a short theoretical introduction in the first part of the thesis. There are described parameters and properties of transistors and general two-ports. Description of the noise characteristics two-ports follows. The next capture contains design of two-stage amplifiers. One of them is with a microstrip filter between stages and the second one is with combline filter on input of the amplifier. The amplifiers and the microstrip filter were designed in program ANSOFT Designer. The design of combline filter was realised in program CST Microwave Studio. Both amplifiers ware made and their properties ware compared with simulations.
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Low Noise Amplifier for the S Band
Benites Ayala, Ivan Alejandro ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
This master's thesis presents the design and the realization of a low noise amplifier (LNA) for the S band of radio frequency spectrum from 2.3 GHz to 2.4 GHz. This thesis is mainly focused on stability and impedance matching networks study. Ansoft Designer and ANSYS HFSS programs are used for this design to simulate the LNA. Different low noise devices are simulated in order to find the best results for the final design. Moreover, a coaxial cavity resonator is designed in the input of the LNA and works as a band pass filter. Finally, the LNA is fabricated and its properties compared with the simulation results.
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Front end for software receiver
Slezák, Jakub ; Horský, Pavel (referee) ; Šrámek, Petr (advisor)
This thesis deals with a theoretical analysis of the basic parameters of receivers, input circuit architecture and signal digitization. According to the specified assignment it is outlined block scheme of front end for software receiver with specified components and the total bilance is calculated. Individual parts of the system are designed and realized. This is a set of four input filters for bandwidths: short waves up to 30 MHz, 87,5-108 MHz, 144-148 MHz and 174-230 MHz. The main point of design is a circuit containing a low-noise amplifiers, switches, and two amplifiers with adjustable amplification. Mainly are used integrated circuits from Analog Devices corporation. To control the various switches and adjustable amplifiers was designed a separate panel, which is connected to the main circuit via a cable. In the last phase was the whole system and its components subjected to measurements. Thanks to a number of mounted SMA connectors it is possible to measure different parts of the system and we are able to modify it partially.
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Low-noise amplifier for 145 MHz band
Pivoňka, Rostislav ; Vágner, Petr (referee) ; Baran, Ondřej (advisor)
This work contains a description of low noise amplifier (LNA) working on 145 MHz. This amplifier consists of three parts. They are input circuit, active device and output circuit. The amplifier is designed with transistor BF 998 on substrate FR4. The design and simulations are performed by means of software Ansoft Serenade. The design was completed with the help of design equations and Smith chart methods. The input of amplifier is noisy matched and output of amplifier is matched on impedance 50 ohms. The noise factor in frequency band 144 – 146 MHz is about 0,85 dB. The amplifier gain is in this band circa 16dB.
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Low noise amplifier for UHF band
Benites Ayala, Ivan Alejandro ; Urbanec, Tomáš (referee) ; Kasal, Miroslav (advisor)
This bachelor’s thesis presents the design of a low noise amplifier for UHF band 430-440MHz. This thesis is mainly focused on stability study and matching networks. For this design is used Ansoft Designer program, through which it is possible to simulate the low noise amplifier. The ATF-54143 transistor is used as main device for this design. Morover, there is designed a band pass filter, which satisfies the requirements for this low noise amplifier.
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Low Noise Amplifier for the S Band
Benites Ayala, Ivan Alejandro ; Vondra, Vlastimil (referee) ; Kasal, Miroslav (advisor)
This master's thesis presents the design and the realization of a low noise amplifier (LNA) for the S band of radio frequency spectrum from 2.3 GHz to 2.4 GHz. This thesis is mainly focused on stability and impedance matching networks study. Ansoft Designer and ANSYS HFSS programs are used for this design to simulate the LNA. Different low noise devices are simulated in order to find the best results for the final design. Moreover, a coaxial cavity resonator is designed in the input of the LNA and works as a band pass filter. Finally, the LNA is fabricated and its properties compared with the simulation results.
|
|
|
Low Noise Amplifiers for frequency range 1-3 GHz
Klegová, Hana ; Zamazal, Michal (referee) ; Kasal, Miroslav (advisor)
This masters thesis deals with low noise amplifier design for frequency range 1 GHz - 3 GHz. There is a short theoretical introduction in the first part of the thesis. There are described parameters and properties of transistors and general two-ports. Description of the noise characteristics two-ports follows. The next capture contains design of two-stage amplifiers. One of them is with a microstrip filter between stages and the second one is with combline filter on input of the amplifier. The amplifiers and the microstrip filter were designed in program ANSOFT Designer. The design of combline filter was realised in program CST Microwave Studio. Both amplifiers ware made and their properties ware compared with simulations.
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|
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Low noise amplifier for UHF band
Benites Ayala, Ivan Alejandro ; Urbanec, Tomáš (referee) ; Kasal, Miroslav (advisor)
This bachelor’s thesis presents the design of a low noise amplifier for UHF band 430-440MHz. This thesis is mainly focused on stability study and matching networks. For this design is used Ansoft Designer program, through which it is possible to simulate the low noise amplifier. The ATF-54143 transistor is used as main device for this design. Morover, there is designed a band pass filter, which satisfies the requirements for this low noise amplifier.
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Front end for software receiver
Slezák, Jakub ; Horský, Pavel (referee) ; Šrámek, Petr (advisor)
This thesis deals with a theoretical analysis of the basic parameters of receivers, input circuit architecture and signal digitization. According to the specified assignment it is outlined block scheme of front end for software receiver with specified components and the total bilance is calculated. Individual parts of the system are designed and realized. This is a set of four input filters for bandwidths: short waves up to 30 MHz, 87,5-108 MHz, 144-148 MHz and 174-230 MHz. The main point of design is a circuit containing a low-noise amplifiers, switches, and two amplifiers with adjustable amplification. Mainly are used integrated circuits from Analog Devices corporation. To control the various switches and adjustable amplifiers was designed a separate panel, which is connected to the main circuit via a cable. In the last phase was the whole system and its components subjected to measurements. Thanks to a number of mounted SMA connectors it is possible to measure different parts of the system and we are able to modify it partially.
|
|
|
Low-noise amplifier for 145 MHz band
Pivoňka, Rostislav ; Vágner, Petr (referee) ; Baran, Ondřej (advisor)
This work contains a description of low noise amplifier (LNA) working on 145 MHz. This amplifier consists of three parts. They are input circuit, active device and output circuit. The amplifier is designed with transistor BF 998 on substrate FR4. The design and simulations are performed by means of software Ansoft Serenade. The design was completed with the help of design equations and Smith chart methods. The input of amplifier is noisy matched and output of amplifier is matched on impedance 50 ohms. The noise factor in frequency band 144 – 146 MHz is about 0,85 dB. The amplifier gain is in this band circa 16dB.
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