|
|
Study of dielectric relaxation in PCB substrates and cable insulation
Ježík, Jan ; Brzobohatý, Jaromír (referee) ; Běťák, Petr (advisor)
This study investigates relaxation polarization in some dielectric components of tester UNISPOT S40 developed by company UNITES Systems a.s. Relaxation polarization in the PCB substrates and in tester’s cable insulation causes undesirable deceleration of some test steps. Relaxation polarization in selected PCB substrates and various cables are examined by method of dielectric relaxation spectroscopy in the frequency domain and by measurement of polarization or depolarization current.
|
|
|
Digitally controlled multifunction filter
Hubka, Patrik ; Kubíček, Michal (referee) ; Ševčík, Břetislav (advisor)
he bachelor thesis deals with the modern design of analog filter where the digital potentiometers to control circuit parameters are used. The main purpose of this thesis is to create a fully digitally controlled filter at frequencies above 1 MHz based on LT1568 integrated circuit. The main circuit parameters such as cut-off frequency, gain, filter order and type of approximation function are digitally controlled. Analysis of parasitic effects of digital potentiometers is included. The integrated circuit functionallity is demonstrated by LTspice circuit simulator. Finally, the experimental measurement results for various circuit parameters setting are included.
|
|
|
Study of the factors that influence setting time during current measurement.
Ježík, Jan ; Macháň, Ladislav (referee) ; Běťák, Petr (advisor)
This study is engaged in the effect of dielectric relaxation on very small direct current setting time after applying voltage of 600 V. Several relaxation phenomenons in dielectric materials stressed by electric field are discussed. Characteristics of three substrates of PCBs are evaluated by using time and frequency domain dielectric relaxation spectroscopy in order to find an optimal material for high speed tester UNISPOT S40 ACCEL construction.
|
|
|
Digitally controlled multifunction filter
Hubka, Patrik ; Kubíček, Michal (referee) ; Ševčík, Břetislav (advisor)
he bachelor thesis deals with the modern design of analog filter where the digital potentiometers to control circuit parameters are used. The main purpose of this thesis is to create a fully digitally controlled filter at frequencies above 1 MHz based on LT1568 integrated circuit. The main circuit parameters such as cut-off frequency, gain, filter order and type of approximation function are digitally controlled. Analysis of parasitic effects of digital potentiometers is included. The integrated circuit functionallity is demonstrated by LTspice circuit simulator. Finally, the experimental measurement results for various circuit parameters setting are included.
|
|
|
Study of the factors that influence setting time during current measurement.
Ježík, Jan ; Macháň, Ladislav (referee) ; Běťák, Petr (advisor)
This study is engaged in the effect of dielectric relaxation on very small direct current setting time after applying voltage of 600 V. Several relaxation phenomenons in dielectric materials stressed by electric field are discussed. Characteristics of three substrates of PCBs are evaluated by using time and frequency domain dielectric relaxation spectroscopy in order to find an optimal material for high speed tester UNISPOT S40 ACCEL construction.
|
|
|
Study of dielectric relaxation in PCB substrates and cable insulation
Ježík, Jan ; Brzobohatý, Jaromír (referee) ; Běťák, Petr (advisor)
This study investigates relaxation polarization in some dielectric components of tester UNISPOT S40 developed by company UNITES Systems a.s. Relaxation polarization in the PCB substrates and in tester’s cable insulation causes undesirable deceleration of some test steps. Relaxation polarization in selected PCB substrates and various cables are examined by method of dielectric relaxation spectroscopy in the frequency domain and by measurement of polarization or depolarization current.
|
guest ::
