Configurable Analog Block Using Current-Mode Approach

Abstract

This paper introduces a new current-mode approach based configurable analog block (CAB) operating in voltage-mode with high input resistance, employing only three impedances in grounded form and providing a wide range functionality. The fourteen functions realized by the CAB include amplifiers, integrators, differentiators, and filters. The nonideal and parasitic analysis of the proposed configurable block is carried out, along with detailed simulation studies using 0.25[Formula: see text][Formula: see text]m CMOS parameters and a supply of [Formula: see text]0.75[Formula: see text]V for justifying the advance to the field. The active element used for designing the CAB exhibits 1.9 and 0.8[Formula: see text]GHz as voltage and current transfer bandwidths, respectively, while also providing low output resistance of 105[Formula: see text][Formula: see text] in voltage conveying action. Thus, the proposed CAB benefits from high frequency performance and lesser sensitivity to errors due to parasitic at that terminal. Most of the functions utilize beneficial form of grounded components. Presentation of conclusive results for integrator, all-pass filter and band-pass filter is included in form of frequency and transient responses. In-depth intermodulation distortion results for band-pass filter are further given. General conclusive annotations on analog circuit design are made at the end of this study.