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Review of Related Literature

This document reviews literature related to precision rectifiers. It discusses how conventional precision rectifiers using CMOS technology and operational amplifiers have issues with linearity and crossover distortion. A current-mode technique is introduced to process AC input signals using current conveyors or operational transconductance amplifiers. The researchers focus on current conveyors due to their flexibility. A current conveyor is described as a three-port device that acts as both a voltage and current buffer according to its matrix equation.

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50 views2 pages

Review of Related Literature

This document reviews literature related to precision rectifiers. It discusses how conventional precision rectifiers using CMOS technology and operational amplifiers have issues with linearity and crossover distortion. A current-mode technique is introduced to process AC input signals using current conveyors or operational transconductance amplifiers. The researchers focus on current conveyors due to their flexibility. A current conveyor is described as a three-port device that acts as both a voltage and current buffer according to its matrix equation.

Uploaded by

Jamil
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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Download as DOCX, PDF, TXT or read online on Scribd
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REVIEW OF RELATED LITERATURE

Precision rectifier is one of the important blocks when it comes to audio circuits, rms to
dc converter applications, and signal processing.
Conventional precision rectifiers, by using CMOS technology, have operational
amplifiers and diode connect MOS transistors[state ang source]. However, these topologies are
very poor in linearity and suffers from crossover distortion[book sa google rive]. During
transitions from conduction to non -conduction situations, op amps and diodes have a problem
in recovering due to the fact that it has small signal dv/dt resulting in distortion in zero crossing
of the input signal[2015_rectifier]. With these limitations, a technique in processing the ac input
is introduced which is current-mode. By using current mode technique, voltage controlled
current sources topologies such as the current conveyor and operational transconductance
amplifier can be used.
In this paper, the researchers are mainly focused on current conveyor due to its flexibility
in frequency response. Current conveyor is a three-port terminal named X,Y,and Z. A
conventional current conveyor is shown in Fig 1. Its operation acts like a voltage buffer and a
current buffer. Voltage buffer due to the fact that when an input voltage is on the Y port, it will be
propagated to the X port. An additional resistor is required at X port in order to produce a
current. With this current produced, it will be propagated to the Z port. With this operation, a
current buffer is realized. The operation of a conventional current conveyor is summarized as a
matrix equation in Eq 1.

Fig 1. Typical block diagram of a current conveyor

Eq 1. CCII operation with Rx as an input resistance at port X

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