CMOS linear voltage‐controlled positive/negative floating resistance configuration and its application in realising a voltage controllable all‐pass filter

Abstract

Summary This letter presents a general CMOS linear voltage‐controlled resistance (VCR) configuration, which can be configured as a voltage‐controlled floating positive resistance (VCFPR) and a voltage‐controlled floating negative resistance (VCFNR) by a simple artifice of changing two connections. The validity of this configuration has been demonstrated by SPICE simulations using 0.18‐μm CMOS process parameters. As an illustration of the utility of the proposed configuration, an application in which both VCFPR and VCFNR are utilised to realise a voltage tuneable all pass filter has been presented whose workability too has been demonstrated by SPICE simulations.