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This paper presents new electronically tunable bandpass filters. The electronic tuning of the center frequency of each filter can be achieved by adjusting the gain of one or more of the voltage-amplifiers connected in the feedback path of the proposed topology without disturbing the constituents of the filter itself; this results in a shadow filter. Experimental results obtained using the AD741 operational amplifier and the AD844 current-feedback operational amplifier are included. [ABSTRACT FROM AUTHOR]

This paper presents a new electronically tunable standard notch, low pass notch and high pass notch filters. All the filters can be obtained from the same topology by adjusting a grounded resistance. The electronic tuning of the notch frequency, the zero frequency and the pole frequency can be achieved by adjusting the gain of a voltage-amplifier connected in the feedback path of the proposed topology without disturbing the constituents of the filter itself; that is a shadow filter Experimental results obtained using the AD844 current-feedback operational amplifier are included. [ABSTRACT FROM AUTHOR]

This paper presents a new current-feedback operational-amplifier (CFOA) based first-order voltage mode all-pass filter (APF). The proposed circuit can be used as a tunable time-delay circuit with relatively large time delays. The circuit enjoys low output impedance and, therefore, can be easily cascaded with similar circuits to obtain larger time delays. The functionality of the circuit was confirmed using PSPICE simulation tool and commercially available integrated circuit (AD844). The simulation results show that delay can be tuned from 10µs to 256µs. [ABSTRACT FROM AUTHOR]

This paper presents the experimental results obtained from the synchronization of two memristor-based Wien-bridge oscillators. The experimental results show that synchronization is feasible between two chaotic oscillators. This is very important for implementing chaotic-based secure communication systems. The experiment can be easily introduced in an undergraduate laboratory course to demonstrate the feasibility of synchronizing chaotic memristor-based oscillators. [ABSTRACT FROM AUTHOR]

An algorithm is developed for calculating the gain margin of a multipole system. Although a Newton—Raphson iteration is generally necessary, a closed form solution is feasible for a limited number of poles. [ABSTRACT FROM AUTHOR]