Muhammad Taher Abuelma'atti

A new current-controlled multiphase sinusoidal oscillator using translinear current conveyors

A multiphase sinusoidal oscillator circuit is presented. The oscillator can produce N output-currents (N being even or odd) equally spaced in phase. The circuit uses translinear bipolar second-generation current-controlled conveyors, grounded capacitors and enjoys low active and passive sensitivities and independent current-control of the frequency of oscillation.

Current-mode sinusoidal oscillators using single FTFN

New current-mode sinusoidal oscillator circuits are presented. The proposed circuits use single four-terminal floating nullor and, at most, eight passive elements. Two of the oscillator circuits use grounded capacitors and enjoy the independent grounded-element control of the frequency of oscillation and the condition of oscillation. Experimental results are included.

Grounded capacitor current-mode oscillator using single current follower

A new configuration for realizing a current-mode oscillator using single positive current-follower is presented. The circuit uses three grounded capacitors and three resistors. The feasibility of obtaining a quadrature oscillator is investigated

A novel mixed-mode OTA-C universal filter

A novel mixed-mode biquad circuit is presented. The circuit uses six single-output- and one dual-output-operational transconductance amplifiers, two grounded capacitors; and can realize lowpass, highpass, bandpass, notch, lowpass-notch, highpass-notch and allpass responses from the same topology. The circuit can be driven by voltage or current and its output can be voltage or current. The parameters ωo and ωo/Q o enjoy independent electronic tunability. Simulation results are included.

A simple algorithm for fitting measured data to Fourier‐series models

An algorithm is described for fitting measured data to Fourier‐series models of any order without recourse to discrete Fourier transform or curve‐fitting routines. The implementation of this algorithm requires only simple basic mathematical operations and can be easily implemented in microcomputer‐ or microprocessor‐based real‐time systems.

Novel CCI-based single-element-controlled oscillators employing grounded resistors and capacitors

Novel single-element controlled oscillator circuits using two negative first-generation current-conveyors, two (or three) grounded capacitors and three (or two) grounded resistors are presented. The proposed circuits enjoy oscillation control through a single grounded passive element and independent frequency control through another single grounded passive element.

A novel mixed-mode current-conveyor-based filter

A new mixed-mode biquad circuit is presented. The circuit uses six single-output plus-type second-generation current-conveyors (CCII+s), a single dual-output CCII+, two grounded capacitors, eight resistors, at least two of them permanently grounded, and can realize lowpass, highpass, bandpass, notch, lowpass notch, highpass notch and allpass responses from the same topology. The circuit can be driven by voltage or current and its output can be voltage or current. The parameters ω0 and ω0/Q 0 enjoy independent electronic tunability. Simulation results are included.

Electronically tunable capacitance multiplier and frequency-dependent negative-resistance simulator using the current-controlled current conveyor

Electronically tunable capacitance multipliers and a frequency-dependent negative-resistance (FDNR) are presented in this article. The multiplying factors of the capacitance multipliers and the value of the FDNR are tunable by adjusting the bias current of a plus-type current-controlled current-conveyor (CCCII+). The feasibility of obtaining temperature-independent capacitance multiplication factors is explored and the SPICE simulation results included.

New universal filter using two current-feedback amplifiers

A new universal voltage-mode second-order filter circuit is presented. The circuit has three inputs and one-low-impedance output and can realize all the standard filter functions; lowpass, highpass, bandpass, notch and allpass, without changing the passive elements. The proposed circuit uses only five passive components and enjoys independent control of the natural frequency and the bandwidth, and orthogonal control of the natural frequency and the quality factor as well as low active and passive sensitivities.

A novel single-input multiple-output current-mode current-controlled universal filter

Abstract A novel current-controlled current-mode universal filter is presented. The circuit uses six second-generation current-controlled conveyors and two grounded capacitors. The circuit enjoys independent control of the parameters ω 0 and ω 0 / Q 0 , low active and passive sensitivities and can simultaneously realize all the five basic filter transfer functions. SPICE simulation results are included.