TITLE:
Dual DVCC Based Voltage-Mode Digitally Programmable Biquadratic Filter
AUTHORS:
Ale Imran, Deepesh Arora, Rishabh Kumar
KEYWORDS:
Voltage-Mode; Differential Voltage Current Conveyor (DVCC); Multifunctional Filter; Digitally Controlled Circuits; Current Summing Network
JOURNAL NAME:
Circuits and Systems,
Vol.5 No.1,
January
10,
2014
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.