VDDDA Based Multifunction Voltage-Mode MISO Filter

This paper proposes a voltage-mode second-order multifunction filter that uses a voltage differencing differential difference amplifier (VDDDA) as an active building block. The proposed filter is sort of MISO multifunction filter having three input nodes and single output node. It comprises of one VDDDA, one resistor and two identical capacitors. In this proposal, the filter offers low-pass (LP), high-pass (HP), band-stop (BS), bandpass (BP), and all-pass (AP) responses for the same circuit configuration by selecting the appropriate input signals. The quality factor and natural frequency both can be electronically controllable and tunable with a dc bias current. Theoretical results have been conformed in SYMICA DE simulations using 0.18μm TSMCS CN018 CMOS process parameters with supply voltages of ±0.9V.