DDCC-Based Tunable Voltage-Mode Multifunction Biquadrates Filter
Keywords:
Active filters, voltage-mode, analog electronics, DDCC.Abstract
In this paper, a new tunable voltage-mode
multifunction biquadratic filter employing two differential difference current conveyors (DDCCs) and all grounded passive elements is presented. The proposed biquadratic filter can realize highpass, bandpass and lowpass filter responses, simultaneously. The circuit offers the following advantages: (i) using grounded capacitors attractive for integration and absorbing shunt parasitic capacitances, (ii) using grounded
resistors at X terminals of DDCCs suitable for the variations of filter parameters and absorbing series parasitic resistances at X terminal 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) orthogonal tunable of the resonance angular frequency and quality factor,
and (vii) low active and passive sensitivity performances. HSPICE simulation results using TSMC 0.18µm 1P6M CMOS process technology and ±0.9V supply voltages validate the theoretical predictions.
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