Abstract
The recent advances in IC technology have led to the trend of designing hybrid systems to benefit both analog and the digital domain. Among analog circuits, multifunctional filter along with multiphase oscillator constitutes a building block of critical importance. In this paper, a digitally reconfigurable multi-input-multi-output voltage mode multifunctional biquadratic filter has been presented. The circuit comprises of two differential voltage current conveyors (DVCCs), two grounded capacitors and two floating resistors. The digital controllability is incorporated using a current-summing network (CSN). Tunability of quality factor is achieved by the use of a 3-bit digital control word while keeping the resonant frequency constant. PSPICE simulations using TSMC 0.25 μm CMOS technology have been performed to validate the theoretically predicted results.
Highlights
Voltage-mode active filters exhibiting high input impedance are of great interest as a number of cells can be cascaded for the realization of the higher order filters
The proposed digitally controllable multifunctional voltage mode filter has been simulated and all the realizations are designed and verified using PSPICE simulation tool with good results in support of the theory to ensure that the expected functionality is obtained
The performance of the differential voltage current conveyors (DVCCs) generally deviates from the ideal behavior since, the voltage and current conveying actions are not exact, leading to slight degradation in performance of the circuit realized using these active elements
Summary
Voltage-mode active filters exhibiting high input impedance are of great interest as a number of cells can be cascaded for the realization of the higher order filters. Among the several variations of current conveyor, the most successful type is second-generation current conveyor (CCII) introduced by Sedra and Smith [2] When it comes to applications demanding differential or floating inputs like impedance converter circuits and current-mode instrumentation amplifiers, which require two high input impedance terminals, a single CCII block is no more sufficient. These applications employ floating elements to minimize the number of used CCII blocks [3].
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