Volume 19, Issue 1, November 2015, Pages 33–39
Pratik Ravindra Junwar1 and Usha Verma2
1 Department of Electronics (VLSI and Embedded), MIT Academy of Engineering, Pune, Maharashtra, India
2 Department of Electronics, MIT Academy of Engineering, Pune, Maharashtra, India
Original language: English
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
A Low noise variable gain amplifier (VGA) was designed using TSMC 0.13 um CMOS technology. This design is proposed to work at frequency range of 40 to 950 MHz. In this proposed work a numbers of attenuators are placed after two stages of Low noise amplifiers [LNA]. Each attenuator is used to obtain variable gain of amplifier. Control Voltage is applied to each attenuator to obtain variation in gain. The first stage of amplifier is designed for high gain and low noise figure. The second stage is designed for high gain and high linearity. The proposed VGA have achieved the gain of -0.81 db to 29.08 db at 40 MHz and -3.14 db to 26.644 db at 950 MHz. The noise figure of proposed designed is 1.747 db at 40 MHz and 1.411db at 950 MHz when all attenuators are off and 4.032 db at 40 MHz and 4.995 db at 950 MHz when all attenuators are on.
Author Keywords: Low Noise Amplifier (LNA), variable gain amplifier (VGA), Attenuator, Linearity, Noise figure.
Pratik Ravindra Junwar1 and Usha Verma2
1 Department of Electronics (VLSI and Embedded), MIT Academy of Engineering, Pune, Maharashtra, India
2 Department of Electronics, MIT Academy of Engineering, Pune, Maharashtra, India
Original language: English
Copyright © 2015 ISSR Journals. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Abstract
A Low noise variable gain amplifier (VGA) was designed using TSMC 0.13 um CMOS technology. This design is proposed to work at frequency range of 40 to 950 MHz. In this proposed work a numbers of attenuators are placed after two stages of Low noise amplifiers [LNA]. Each attenuator is used to obtain variable gain of amplifier. Control Voltage is applied to each attenuator to obtain variation in gain. The first stage of amplifier is designed for high gain and low noise figure. The second stage is designed for high gain and high linearity. The proposed VGA have achieved the gain of -0.81 db to 29.08 db at 40 MHz and -3.14 db to 26.644 db at 950 MHz. The noise figure of proposed designed is 1.747 db at 40 MHz and 1.411db at 950 MHz when all attenuators are off and 4.032 db at 40 MHz and 4.995 db at 950 MHz when all attenuators are on.
Author Keywords: Low Noise Amplifier (LNA), variable gain amplifier (VGA), Attenuator, Linearity, Noise figure.
How to Cite this Article
Pratik Ravindra Junwar and Usha Verma, “A Low Noise Variable Gain Amplifier,” International Journal of Innovation and Scientific Research, vol. 19, no. 1, pp. 33–39, November 2015.
