Design of High Performance Low Noise Amplifier

Abstract

The abundance of wireless communication standards has saturated the RF spectrum. The wireless channels are closely spaced in the latest generations of mobile communication. The decreasing gap between wireless channels demands the higher linearity of the receiver circuits. The linearity of the receiver greatly depends on the linearity of the low noise amplifier (LNA). It is mandatory for an LNA to display excellent linearity properties. newlineLNA being the first block of the receiver decides the overall noise performance of the system. The wireless systems working with high frequency are susceptible to the environmental noise and are not in a position to afford the additional noise produced by the receiver system. The LNA must offer the least possible noise from itself to satisfy the overall noise requirements of the receiver. Apart from high linearity and low noise requirements, an LNA is expected to provide excellent reverse isolation properties to prevent the local oscillator radiations.LNA is also responsible for the sensitivity of the receiver systems, which demands an appropriate amount of gain from the LNA. The latest battery operated mobile phones, equipped with RF receiver, imposes the stringent low power requirements on the receiver systems. newlineThe thesis presents a high performance LNA architecture to cater the requirements of the modern day RF receivers. The thesis focuses on the design of an LNA that provides higher second and third order linearity. The detailed literature survey of various linearity improvement techniques is carried out and presented in the thesis. The mathematical analysis of different linearity improvement techniques is also described in the thesis. The thesis highlights the issues involved with each of the linearity improvement technique presented. newlineThe source inductive degenerated, resistive load single stage CS LNA is chosen newline