Electronically tunable current-mode square-root-domain first-order multifunction filter

Abstract

In this article, a new current-mode square-root-domain first-order multifunction filter is designed. The filter circuit has a very simple structure; it uses only the Metal-OxideSemiconductor Field-Effect Transistor (MOSFET) and a grounded capacitor. All transistors' aspect ratios are the same. It provides lowpass, highpass and allpass responses simultaneously for a single input signal. It can be electronically tuned by changing an external DC current. The filter operates with a single supply voltage of 2.5 V. The proposed circuit has been simulated with PSPICE electronics circuit simulation program (Cadence OrCAD Capture CIS Version 9.2) simulation programs using TSMC 0.35 μm (Taiwan Semiconductor Manufacturing Company) Complementary Metal-Oxide-Semiconductor (CMOS) process parameters.

New Log-Domain First-Order Multifunction Filter Using MOSFETs in Weak Inversion

“…Current-mode multifunction filters employing only bipolar junction transistors and a single grounded capacitor have been proposed by Kircay and Cam [8] [9] in 2006 and Arslanalp, Tola and Yuce [10] [11] in 2011. In 2014, Kircay [12] again proposed a multifunction 1 filter using MOS transistors and single grounded capacitor. In this circuit [12], the MOS transistors have been operated in saturated region.…”

“…In 2014, Kircay [12] again proposed a multifunction 1 filter using MOS transistors and single grounded capacitor. In this circuit [12], the MOS transistors have been operated in saturated region.…”

Design of Low Power Current Mode Square-Root Circuit

“…However, op-amp-based square-rooting circuit the high frequency limitation due to the finite gain bandwidth product of the op-amp and some of these not suitable for IC implementation. The current-mode square-root circuit has wide application in design of filters [14,15].…”