Plus-type Differential Difference Current Conveyors Research Articles

Independently tunable plus-type DDCC-based voltage-mode universal biquad filter with MISO and SIMO types

This paper presents an independently tunable voltage-mode universal biquad filter using three plus-type differential difference current conveyors (DDCC+s), two grounded capacitors, three / four grounded resistors and one floating resistor. The proposed biquad filter can simultaneously realize all five universal filtering responses (lowpass, highpass, bandpass, notch, and allpass) in single-input multiple-output type (SIMO type) and also can provide all of them in multiple-input single-output type (MISO type) without changing the filter topology. The proposed circuit does not need component matching conditions to realize any filter responses for both MISO and SIMO types. On the other hand, the circuit also can realize another SIMO and MISO high-input impedance voltage-mode universal biquad filter with controllable gains and using only grounded passive components. In all cases, the proposed circuit not only permits orthogonal tunability of ω0 and Q but also achieves independent tunability of ω0 and ω0/Q by using only grounded resistors without the need of control factors matching conditions. No extra inverting or non-inverting amplifiers are required for realizing any filter responses, and all the active and passive sensitivities are low. HSPICE simulations with TSMC 0.18µm 1P6M CMOS process technology and experimental results validate theoretical predictions.

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.

High-Input Impedance Voltage-Mode Multifunction Filter with Four Grounded Components and Only Two Plus-Type DDCCs

This paper introduces a novel voltage-mode multifunction biquadratic filter with single input and four outputs using two plus-type differential difference current conveyors (DDCCs) and four grounded passive components. The filter can realize inverting highpass, inverting bandpass, noninverting lowpass, and noninverting bandpass filter responses, simultaneously. It still maintains the following advantages: (i) using grounded capacitors attractive for integration and absorbing shunt parasitic capacitance, (ii) using grounded resistors at allXterminals of DDCCs suitable for the variations of filter parameters and absorbing series parasitic resistances at allXterminals of DDCCs, (iii) high-input impedance good for cascadability, (iv) no need to change the filter topology, (v) no need to component-matching conditions, (vi) low active and passive sensitivity performances, and (vii) simpler configuration due to the use of plus-type DDCCs only. HSPICE and MATLAB simulations results are provided to demonstrate the theoretical analysis.

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

A new high input impedance voltage-mode universal biquadratic filter with three input terminals and five output terminals is presented. The proposed circuit uses three plus-type differential difference current conveyors, two grounded resistors and two grounded capacitors. The proposed circuit can realize all the standard filter functions: lowpass, bandpass, highpass, notch and allpass, without component matching conditions. The proposed circuit offers the features of high input impedance, low active and passive sensitivities and the use of only grounded resistors and capacitors.

High-Input and Low-Output Impedance Voltage-Mode Universal Biquadratic Filter Using DDCCs

A new three inputs and single output voltage-mode universal biquadratic filter with high-input and low-output impedance using three plus-type differential difference current conveyors, two grounded capacitors and two grounded resistors is presented. The proposed circuit offers the following features: realization of all the standard filter functions, that is, high-pass, bandpass, low-pass, notch, and all-pass filters, no requirements for component matching conditions, the use of only grounded capacitors and resistors, high-input and low-output impedance and low active and passive sensitivities.