Academic literature on the topic 'Filtry s CCII+'

In this paper, a floating inductance and frequency-dependent negative resistance (FDNR) depending on the passive element selection is presented. The proposed circuit employs only plus-type second-generation current conveyors (CCII+s) as active elements, together with two resistors and two capacitors for realizing floating inductance and FDNR. Both of the capacitors in the floating inductance realization are grounded. Also, electronically tunable floating FDNR is obtained with the proposed circuit. The nonideality effects of the current conveyors on the proposed circuit are given. The proposed circuit is used in a low-pass ladder filter, and simulated with SPICE to exhibit its performance.

In this paper, a universal current-mode second-order active-C filter for simultaneously realizing low-pass, band-pass and high-pass responses is proposed. The presented filter employs only three plus-type second-generation current-controlled conveyors (CCCII+s). This filter needs no critical active and passive component matching conditions and no additional active and passive elements for realizing high output impedance low-pass, band-pass and high-pass characteristics. The angular resonance frequency (ω0) and quality factor (Q) of the proposed resistorless filter can be tuned electronically. To verify the theoretical analysis and to exhibit the performance of the proposed filter, it is simulated with SPICE program.

PhD. thesis is deals about sekond order ARC filters for cascade synthezis of Active filters. Here are presented new configurations of second order filters with current conveyors usable for higher frequencies and new second order filters with current conveyors usable for electrical tunable filters. In PhD. Thesis are presented schematics and equations for new sekond order filters. There are presented also practical realizations of these filters and basic measure results.

The aim of the thesis is to study the possibilities of the electronic frequency ?lter com- posed of active elements operating in current mode. The main opportunities lie in the change control parameters, most are marginal or quality factor frequency. As the active elements are considered especially CC (Current Convejor), controllable current ampli?er DACA (Digitally Adjustable Current Ampli?er) or combination with the current tracker MO-CF (Multiple Output Current Follower). Another part will focus on the management of the above parameters using digital potentiometers and choosing the appropriate ?lter structure. The ?nal task was to digital control parameters using a PC and measuring its properties.

This master’s thesis is bent on comparison of four newest method of analog frequency filter design. After the introductory part, a description of properties and internal structure of active elements (Second-Generation Current Conveyor), VG-CCII (Variable Gain Current Conveyor), VCG-CCII (Voltage and current gained second generation current conveyor) a CFTA (Current Follower Transconductance Amplifier) is mentioned. This active elements are used in subsequent design. At the next part, process of frequency filters design by generalized method of filter design flowing from the full admittance network, by extending autonomous circuits, design using the signal flow graphs theory and design with synthetic high-order elements are presented. Thirty nine autonomous circuits are derived from full admittance networks with one and two active elements CFTA. Selected autonomous circuits are used for direct design of frequency filter and for filter design by extending autonomous circuits. Produced structures guarantee the possibility of controlling the quality factor Q0 independently of the characteristic frequency f0. Three frequency filters are designed by method using the signal flow graph theory. Active elements CFTA, VG-CCI and VCG-CCII are used. Full multifunctional frequency filter with conveyors VG-CCII and VCG-CCII guarantee the possibility of controlling the quality factor Q0 and the characteristic frequency f0 independently of the each other. In last part, from 2nd to 5th order low-pass filters by the method using synthetic high-order elements are designed. The behaviour of the selected filters has been verified by simulations in the PSpice program for all of the mentioned methods separately.

碩士
中原大學
電機工程學系
88
In this thesis, we apply the Nullator-norator approach to propose five novel biquad filter circuits by employing active current-mode elements such as CCII(s), DO-CCII(s) and Unity-gain Cell(s). 1. Novel universal current-mode filters with single input and three outputs employing three DO-CCII’s The new universal current-mode filters with a single input and three outputs employing three dual-output second-generation current conveyors (DO-CCII’s), three grounded resistor, two grounded capacitors are presented. The proposed circuits offer the following advantageous features: universal current-mode filter realization from the same configuration, no requirements for critical component matching conditions in realizing the low-pass and band-pass filter responses, use of only two grounded capacitors ideal for integration, use of three grounded resistors good for magnitude adjustment, orthogonal control for ωo/Q and ωo through separate grounded resistors, high output impedance and low active and passive sensitivities. 2. Novel universal current-mode filters with single input and three outputs employing three DO-CCII’s The new universal current-mode filters with a single input and three outputs employing three dual-output second-generation current conveyors (DO-CCII’s), two grounded capacitors, one grounded and one virtually grounded resistor are presented. The proposed circuits offer the following advantageous features: universal current-mode filter realization from the same configuration, simultaneous realization of low-pass, band-pass and notch fliter responses from the high impedance terminal, no requirements for critical component matching conditions in realizing the low-pass, band-pass, high-pass, notch and all-pass filter responses, use of only two grounded capacitors ideal for integration, high output impedance and low active and passive sensitivities. 3. Novel universal active current-mode filter with three inputs and single output employing three (CCII)s. The new universal current-mode filters with a single input and three outputs employing two (CCIIs), one dual output second-generation current conveyor(DO-CCII), two grounded resistor and two grounded capacitors are presented. The proposed circuits offer the following advantageous features: universal current-mode filter realization from the same configuration, no requirements for critical component matching conditions in realizing the low-pass, band-pass, high-pass, notch and all-pass filter responses, use of only two grounded capacitors and two grounded resistor ideal for integration, two grounded resistors attractive for adjustment, high output impedance and low active and passive sensitivities. 4. Novel universal current-mode filters with single input and three outputs employing five Unity-gain cells The new universal current-mode filters with a single input and three outputs employing three dual-output unity gain current followers (CFs), two unity gain voltage buffers (VFs), two grounded capacitors and two virtually grounded resistors are presented. The proposed circuits offer the following advantageous features: universal current-mode filter realization from the same configuration, use of only two grounded capacitors ideal for integration, high output impedance and low active and passive sensitivities. 5. Novel universal current-mode filters with three inputs and one output employing five Unity-gain cells The new universal current-mode filters with three inputs and one output employing three current followers (CF), two voltage buffers (VFs), two grounded capacitors and three virtually grounded resistors are presented. The proposed circuits offer the following advantageous features: universal current-mode filter realization from the same configuration, no requirements for critical component matching conditions in realizing the low-pass, band-pass, high-pass, notch and all-pass filter responses, use of only two grounded capacitors ideal for integration, high output impedance and low active and passive sensitivities. All the above proposed circuits have the simpler configuration than those proposed before. We use PSPICE and Matlab softwares to verify our result. Simulation agree well with theory.