Desing of RF front-end receiver sub-system

Abstract

A Radio Frequency(RF) front end receiver subsystems; Low Noise Amplifier(LNA) and mixer is designed at RF frequency of 2.45GHz. The main design aim of LNA is to enhance the performance parameters, especially to minimise the noise figure with considerable amount of gain. Feedback topology is introduced, which compensates the inherent decrease in gain of device at higher frequency and enhances the stability without any major effect on noise figure. The proposed dual stage cascaded LNA provides us the gain of 38.40dB with noise figure of 0.56dB.A drain pumped active mixer is presented, which converts the incoming RF signal of 2.45GHz to a very common Intermediate Frequency(IF) frequency of 480MHz with the help of Local Oscillator(LO) power of 10dBm at 1.97GHz. The designed mixer utilizes a single active device and consumes zero Direct Current(DC) power; thus, making it very suitable for the low power consuming and compact size applications. The mixer provides us the 3rd order Intercept point(IIP3) of 11.65dBm with gain of 9.25dB and noise figure of 13.69dB.