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Filters with current mirrors
Kotlán, Petr ; Herencsár, Norbert (referee) ; Lattenberg, Ivo (advisor)
A second-order frequency-selection filters with current amplifier design is shortly shown in this bachelor's thesis. An autonomous circuit was modified to be conform with all rules of functionality of filters. A few version of autonomous circuit are shown i this text. The circuits were simulated by a program Microcap expecially transient and AC analysis. The current amplifier was replaced by a current mirror or more precisely by a current inverter. A direct-current and his relations to suplied harmonic signal were investigated. A deformation of a harmonic signal is unwanted. This deformation is ussualy created by the transistors in nonlinear mode. This current have to have special ratio to the alternating-current. A sixth-order filter was created by cascade connection of three second-order blocks. This more intricated circuit is correct. A correct rate of characteristic due for low-pass, high-pass and band-pass was shown thanks AC analysis.
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Utilization of CDTA and CFTA elements in electrical circuits and frequency filters
Kotlán, Petr ; Herencsár, Norbert (referee) ; Kubánek, David (advisor)
Thesis deals about active component in current mode, CDTA (current differencing transconductance amplifier) and CFTA (current follower transconductance amplifier). CDTA compares two input currents. Outcome current comes trough added terminal Z to load. Caused voltage is transfered to output current by transconductance g. Output surrents shall be possitive (terminal X+) or negative (terminal X-). In contrast to CDTA, CFTA has one current input. Components were used in filters and oscillators. Some filters of second order realized simultaneously low, hight and nad pass were designed. Then, the transfer of filters with diverse topology with opperational amplifier to filter with CDTA and CFTA was shown. Some oscillators were designed. Designed circuits were simulated. Transistor models of CDTA and CFTA were created to purpose of simulation. This components can be realized by AD844 and MAX435. There are shown the conclusions of AC analysis of filters and transission analysis of oscillators. The thesis contains practical realization of second order frequency filter also. Device was made like a PCB by smd. CFTA was realized by components AD844 and MAX435.
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Filters with current mirrors
Kotlán, Petr ; Herencsár, Norbert (referee) ; Lattenberg, Ivo (advisor)
A second-order frequency-selection filters with current amplifier design is shortly shown in this bachelor's thesis. An autonomous circuit was modified to be conform with all rules of functionality of filters. A few version of autonomous circuit are shown i this text. The circuits were simulated by a program Microcap expecially transient and AC analysis. The current amplifier was replaced by a current mirror or more precisely by a current inverter. A direct-current and his relations to suplied harmonic signal were investigated. A deformation of a harmonic signal is unwanted. This deformation is ussualy created by the transistors in nonlinear mode. This current have to have special ratio to the alternating-current. A sixth-order filter was created by cascade connection of three second-order blocks. This more intricated circuit is correct. A correct rate of characteristic due for low-pass, high-pass and band-pass was shown thanks AC analysis.
|
|
|
Utilization of CDTA and CFTA elements in electrical circuits and frequency filters
Kotlán, Petr ; Herencsár, Norbert (referee) ; Kubánek, David (advisor)
Thesis deals about active component in current mode, CDTA (current differencing transconductance amplifier) and CFTA (current follower transconductance amplifier). CDTA compares two input currents. Outcome current comes trough added terminal Z to load. Caused voltage is transfered to output current by transconductance g. Output surrents shall be possitive (terminal X+) or negative (terminal X-). In contrast to CDTA, CFTA has one current input. Components were used in filters and oscillators. Some filters of second order realized simultaneously low, hight and nad pass were designed. Then, the transfer of filters with diverse topology with opperational amplifier to filter with CDTA and CFTA was shown. Some oscillators were designed. Designed circuits were simulated. Transistor models of CDTA and CFTA were created to purpose of simulation. This components can be realized by AD844 and MAX435. There are shown the conclusions of AC analysis of filters and transission analysis of oscillators. The thesis contains practical realization of second order frequency filter also. Device was made like a PCB by smd. CFTA was realized by components AD844 and MAX435.
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