Abstract:

This paper has proposed a new architecture for variable gain amplifier (VGA) built in the 0.18μm CMOS technology. In this paper, a new definitive approach is proposed for achieving a large band range of DC gain, acceptable bandwidth (-3dB) with low power consumption and high linearity. This proposed VGA was designed on the Cadence Virtuoso tool for receiver system used in RF, consisting of trans-impedance amplifier and trans-conductor amplifier which are in linear mode. This VGA also attains DC gain range from -35 to 19 dB, and bandwidth is around 25.8 MHz (-3dB). Meanwhile, the proposed VGA, Unity Gain Bandwidth of is nearly 3.32GHz with noise figure nearly 20dB. Overall circuit consumes total power approximately 2.3mW.
Keywords— VGA, Bandwidth, Power Consumption, DC gain.

Introduction:

Amplifiers are the main elements of both analog and digital telecommunications systems. They assist in increasing the dynamic input range of signal processing. Amplifiers, or VGA, can be mounted. This means amplifiers can be used to adjust the signal gain to satisfy the requirements of dynamic range . It provides many advantages compared to other similar systems and hence the technology was undone.

It provides various advantages over other similar systems, so since the last few decades the technology has been under intensive study and almost all countries are spending a huge amount on its development [4]. Wireless system automatic gain control system which is performed by Variable Gain Amplifier (VGA) is of great importance. The VGA is used in various remote sensing and communication equipment applications.
VGA technologies involve radar, ultrasonic, cellular, and voice processing. Such implementations utilize the VGA to improve performance characteristics. VGA designs employ two key gain adjustment methods, categorized and as per the varieties of the control signal: digital or analog [8].
In communications networks, the regulation of the power level of the received signal and the normalization of the mean amplitude of the signal to the supply voltage play a vital part in receivers. This aims to enhance device capabilities and increases the efficiency of circuits built at the receiving end to retrieve the correct processing data and information. In terms of noise, linearity, bandwidth, power consumption and for multiple applications, VGAs will differ significantly [12-15].
This paper introduces a novel gain amplifier structure with a broad bandwidth, linear and low power characteristics. This proposed paper is categorized as follows: The methodology of design is discussed in section II. The basic concept behind the proposed VGA design is introduced in section