Date of Graduation

12-2011

Document Type

Thesis

Degree Name

Master of Science in Electrical Engineering (MSEE)

Degree Level

Graduate

Department

Electrical Engineering

Advisor

Alan Mantooth

Committee Member

Randy Brown

Second Committee Member

Scott Smith

Keywords

Applied sciences, Cmos, Design, Lna, Low noise amplifier, Wireless sensor networks

Abstract

CMOS technology becomes important in Radio Frequency (RF) communication systems which include both a receiver and a transmitter. In a high performance radio receiver, the Low Noise Amplifier (LNA) is the first circuit, and its noise performance dominates the entire receiver. Depending upon the system in which they are used, LNAs can be designed according to various topologies and structures. The LNA needs to have matched input impedance, and at the same time it should amplify the small amplitude input signal without adding too much noise and still have the minimal power consumption. It also needs a good interface with external filters for input and output matching networks; usually the input impedance is matched to a 50 Ù source resistor. Low noise figure, reasonable gain, stability and linearity are important properties for the LNA. This thesis will present a technique for implementing a CMOS Low Noise Amplifier with inductive source degeneration, compare this approach with other topologies, analyze the source of noise, and match the input and output impedance. The design requirements for the LNA are operation at 433 MHz, achieving noise figure smaller than 2 dB, and voltage gain around 15 dB. The circuit was implemented in the IBM 130 nm CMOS process.

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