Design of Wideband Variable Gain Amplifier for Receiver System

This paper has proposed a new architecture for variable gain amplifier (VGA) built in the 0.1S$\mu$m 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.