Single Input Multi Output Digitally Reconfigurable Biquadratic Analog Filter

In this paper, a digitally re-configurable Single Input Multi Output voltage mode multifunctional biquadratic analog filter has been presented. The circuit realizes a Single Input Multi Output filter with non-inverting High Pass, Band Pass and Low Pass outputs and employs four Differential Voltage Current Conveyor blocks and uses seven passive components which are two grounded capacitors and five grounded resistors. Digital controlling is incorporated using a current summing network. Tuning of cut-off frequency is carried out with the help of a 3–bit digital control word (k). PSPICE simulations using TSMC 0.25 micron CMOS technology have been performed to validate the theoretically predicted results. Keywords-Voltage-mode; Differential Voltage Current Conveyor (DVCC); multifunctional filter; digitally programmable circuits; Current Summing Network (CSN); Single Input Multi Output (SIMO).