A comprehensive,adjustable approach for linearizing and broadening the gain characteristic of variable gain amplifiers |
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| Affiliation: | 1. Electrical Engineering Department, Shahid Bahonar University of Kerman, Kerman, Iran;2. Electrical and Computer Engineering Department, Tarbiat Modares University, Tehran, Iran;1. Department of Mathematics, Isfahan University of Technology, Isfahan 84156-83111, Iran;2. Department of Electrical & Computer Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran;3. School of Mathematics, Institute for Research in Fundamental Sciences (IPM), P.O. Box 19395-5746, Tehran, Iran;1. Department of Electrical Engineering, University of Science and Technology, Tehran, Iran;2. Department of Electrical and Computer Engineering, University of Tehran, Tehran, Iran;1. Centre of Excellence in Nanoelectronics, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra, India;2. Institut Interdisciplinaire d’Innovation Technologique (3IT), Universite de Sherbrooke, 3000 boul. de l’Universite, Sherbrooke, QC, Canada J1K 0A5;3. Laboratoire Nanotechnologies Nanosystemes (LN2){CNRS UMI-3463}, Universite de Sherbrooke, 3000 boul. de l’Universite, Sherbrooke, QC, Canada J1K 0A5 |
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| Abstract: | In this paper a comprehensive approach is presented to linearize and adjust gain characteristic of variable gain amplifiers (VGAs). It is also capable of increasing the output linear dynamic range of VGAs and modifying variation range of control voltage. The approach is able to change the voltage gain characteristic of an amplifier, even after fabrication, to a desired one by means of a digital control signal and a digital to analog converter. Using this approach, the gain of basic differential amplifier is controlled by two different predistorters, and adjustable dB-linear characteristics in range of greater than 60 dB are achieved. The approach, also, is applied to two conventional VGAs, the gain characteristic of first VGA is linearized, and in the second VGA, the linear dynamic range is expanded about 26 dB. The controller uses 1.2 V voltage supply, and simulations are done using 0.13 µm CMOS process model. The other characteristics of each mode of control are reported completely. |
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| Keywords: | VGA dB-linear Dynamic range Adjustable gain characteristic |
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