Abstract
This research paper contains a new electronically tunable current-mode biquadratic universal filter using a new active building block; current controlled differential difference current conveyor transconductance amplifier (CCDDCCTA). The proposed filter provides the following important and desirable features: (i) One can use only one CCDDCCTA and two capacitors; (ii) One can get low pass (LP), band pass (BP), high pass (HP), notch (NF) and all pass (AP) current responses from the same configuration without any alteration; (iii) Passive components are grounded, which ease the integrated circuit implementation; (iv) Responses are electronically tunable; and (v) Sensitivity is low. Moreover, the non-ideality analysis shows that the parasitic passive components can be compensated for the proposed circuit. The functionality of the design is verified through SPICE simulations using 0.25 μm CMOS TSMC technology process parameters. Simulation result agrees well with the theoretical analysis.
Highlights
Universal biquadratic filters are those which provide all standard filter functions (low pass (LP), band pass (BP), How to cite this paper: Kushwaha, A.K. and Paul, S.K. (2015) Current Mode Universal Filter Using Single Current Controlled Differential Difference Current Conveyor Transconductance Amplifier
It has high input impedance terminals for voltage and high output impedance terminals for currents. It can process both differential and floating inputs. It inherits all the good properties of current controlled differential difference current conveyor (CCDDCC), current conveyor transconductance amplifier (CCCCTA) and differential difference current conveyor transconductance amplifier (DDCCTA) along with electronic tuning of transconductance, which is found to be useful in design of various circuits with lesser number of resistors and integrated circuit implementation
The symbol of CCDDCCTA and its implementation using CMOS are shown in Figure 1 and Figure 2 respectively
Summary
Universal biquadratic filters are those which provide all standard filter functions (low pass (LP), band pass (BP),. It is basically composed of current controlled differential difference current conveyor (CCDDCC) [30] followed by a transconductance amplifier (TA) block. The proposed current mode filter circuit can realize high pass (HP), low pass (LP), band pass (BP), notch and all pass (AP) filter responses by selecting appropriate input current without alteration of the topology. It can be cascaded, as its output is current and impedance is high.
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