A Novel Precision Current-mode Fullwave Rectifier Using Current-controlled Current Conveyors and OTAs

Abstract

This article introduces a novel version for implementing current-mode precision full-wave
rectifier, employing second generation Current-controlled Current Conveyors (CCCIIs) cooperating
with Operational Transconductance Amplifiers (OTAs). The features of the proposed circuit are that:
it can rectify current signal with controllable output magnitude via an input bias current: the output
current is free from ambient temperature variation. In addition, polarity of the output current signal
can be arbitrarily controlled by voltage in the circuit to be either positive or negative without changing
circuit topology, which differs from the previous literatures. Circuit description merely consists of a
temperature-insensitive current amplifier using 2 CCCIIs and 2 OTAs working in saturation-mode to
serve as current-switching devices. The performances of the proposed circuit are investigated through
PSPICE. They show that the proposed circuit can function as a current-mode precision full-wave
rectifier where input current range from -100μA to 100μA can be achieved at ±1.5V power supplies.
The maximum power consumption is 554.8μW. Furthermore, the highest frequency is restricted at
megahertz range. With claimed outstanding features, it is very appropriate to further develop the
proposed circuit to be a part of a monolithic chip for working in a current-mode signal processing.