Wei-Yuan Chiu

Voltage-mode highpass, bandpass and lowpass filters using two DDCCs

A new configuration for realizing voltage-mode highpass, bandpass and lowpass filters, simultaneously, using two differential difference current conveyors (DDCCs), two grounded capacitors and two grounded resistors is presented. The proposed circuit offers the following features: realization of highpass, bandpass and lowpass signals from the same configuration, no requirements for component matching conditions, the use of only grounded capacitors and resistors, high input impedance, low active and passive sensitivities and simpler configuration due to the use of only two DDCCs and four passive components.

First-order allpass filter and sinusoidal oscillators using DDCCs

A voltage-mode first-order allpass filter using one differential difference current conveyor (DDCC), one grounded capacitor and one floating resistor is presented. No passive component matching constraints are required. Because the output impedance of the proposed allpass filter is low, the output terminal can be directly connected to the next stage. Using the proposed first-order allpass filter as a basic building block, a new quadrature oscillator and even-phase sinusoidal oscillators can be obtained. The simulation results confirm the theoretical analysis.

Current-Mode Universal Biquadratic Filter with Five Inputs and Two Outputs Using Two Multi-Output CCIIs

A current-mode universal biquadratic filter with five input terminals and two output terminals is presented. The proposed circuit uses two multi-output second generation current conveyors, two grounded capacitors and three resistors. The new circuit offers the following advantages: use of the minimum number of active components, orthogonal controllability of resonance angular frequency and quality factor, use of grounded capacitors and the versatility to synthesize any type of active filter transfer functions.

High Input Impedance Voltage-Mode Universal Biquadratic Filter with Three Inputs and Six Outputs Using Three DDCCs

A new high input impedance voltage-mode universal biquadratic filter with three input terminals and six output terminals is presented. The proposed circuit uses three plus-type differential difference current conveyors (DDCCs), three resistors, and two grounded capacitors. The proposed circuit can realize all the standard filter functions, namely, lowpass, bandpass, highpass, notch, and allpass, simultaneously, without component matching conditions. The proposed circuit still offers the features of high input impedance, using only grounded capacitors, and orthogonal controllability of resonance angular frequency and quality factor.

DVCC-Based Voltage-Mode Biquadratic Filter with High-Input Impedance

A high-input impedance voltage-mode universal biquadratic filter with one-input and five-outputs is presented. The proposed circuit uses three plus-type differential voltage current conveyors (DVCCs), two grounded capacitors and three resistors and offers the following features: the realization of all the standard filter functions, that is, high-pass, band-pass, low-pass, notch, and all-pass filters, orthogonal control of omega o and Q, the use of only grounded capacitors, high-input impedance and low active and passive sensitivities.

Universal filter with one input and five outputs using DDCCs

In this paper, a new single input and five outputs voltage-mode universal biquadratic filter with high-input impedance is presented. The proposed circuit employs three plus-type differential difference current conveyors, two grounded capacitors and three resistors and offers the following features: realization of all the standard filter functions, that is, high-pass, band-pass, low-pass, notch, and all-pass filters simultaneously, the use of only grounded capacitors and high-input impedance.

High-Input Impedance Voltage-Mode Universal Biquadratic Filter with One input and Five Outputs Using DDCCs

A new single input and five outputs voltage-mode universal biquadratic filter with high-input impedance using three plus-type differential difference current conveyors (DDCCs), two grounded capacitors and two resistors is presented. The proposed circuit offers the following features: realization of all the standard filter functions, that is, high-pass, band-pass, low-pass, notch, and all-pass filters simultaneously without component matching conditions, the use of only grounded capacitors and high-input impedance.

DVCCs based high input impedance voltage-mode three-inputs universal biquad

In this paper, a voltage-mode universal biquadratic filter with high input impedance is presented. The proposed circuit has three input terminals and uses three differential voltage current conveyors (DVCCs), two grounded capacitors and two resistors. It can realize all the standard filter functions that are highpass, bandpass, lowpass, notch, and allpass filters by the adjustments of input voltage signals and offer the following features: no requirements for component matching conditions, the use of only grounded capacitors, high input impedance and low active and passive sensitivities.

A NMOS First-order All-pass Filter

In this paper, a new first-order all-pass filter is presented. The proposed configuration employs only four NMOS transistors, two diodes, two resistors and one grounded capacitor. The use of grounded capacitor makes the proposed circuit suitable for integrated circuit implementation. PSPICE simulations that verify the theoretical analyses are also included.

Cascadable voltage-mode three inputs universal biquad using DVCCs

This paper presents a new three-input one-output voltage-mode universal biquadratic filter with high input and low output impedances. The circuit uses three plus-type differential voltage current conveyors (DVCCs), two grounded capacitors and two resistors and offers the following features: realization of all the standard filter functions, that is, highpass, bandpass, lowpass, notch, and allpass filters, no requirements for component matching conditions, the use of only grounded capacitors, high input and low output impedances and low active and passive sensitivities. HSPICE simulation results confirm the theoretical analysis.