20 research outputs found
A Simple Current-Mode Quadrature Oscillator Using Single CDTA
This article presents a simple current-mode quadrature oscillator using a single Current Differencing Transconductance Amplifier (CDTA) as the active element. The oscillation condition and oscillation frequency can be electronically controlled. The circuit structure is very simple, consisting of merely one CDTA, one resistor and two capacitors. The proposed circuit is suitable for IC architecture. The PSpice simulation and experimental results are shown, and the results agree well with the theoretical assumptions
Three-Input Single-Output Electronically Controllable Dual-Mode Universal Biquad Filter Using DO-CCCIIs
This article presents a dual-mode (voltage-mode and
current-mode) universal biquadratic filter performing
completely standard functions: lowpass, highpass, bandpass,
band-reject, and allpass functions, based on plus-type
dual-output second-generation, current controlled, current
conveyor (DO-CCCII+). The features of the circuit are that
the bandwidth and natural frequency can be tuned
electronically via the input bias currents: the circuit
description is very simple, consisting of merely 2 DO-CCCIIs
and 2 capacitors: the circuit can provide either the
voltage-mode or current-mode filter without changing circuit
topology. Additionally, each function response can be selected
by suitably selecting input signals with digital method.
Without any external resistors, the proposed circuit is very
suitable to further develop into an integrated circuit. The
PSPICE simulation results are depicted. The given results
agree well with the theoretical anticipation. The maximum
power consumption is approximately 1.81 mW at
±1.5 V supply
voltages
Realization of electronically controllable first-order current-mode allpass filter using CCCHs and its application
This article presents a resistorless current-mode first-order slip ass filter based on second generation current controlled current conveyors (CCCHs). The features of the circuit are that: the pole frequency can be electronically controlled via the input bias current: the circuit description is very simple, consisting of 2 CCCHs and single grounded capacitor, without any external resistors and component matching requirements. Consequently, the proposed circuit is very appropriate to further develop into an integrated circuit. Low input and high output impedances of the proposed configuration enable the circuit to be cascaded in current-mode without additional current buffers. The PSpice simulation results are depicted. The given results agree well with the theoretical anticipation. The application example as a current-mode quadrature oscillator is included