|Low noise amplifier design
|Amplifiers (Electronics) -- Noise
Amplifiers (Electronics) -- Design and construction
Hong Kong Polytechnic University -- Dissertations
Department of Electronic and Information Engineering
|xi, 88 leaves : ill. ; 30 cm
|The objective of this report is to study the noise performance and the design of a low-noise amplifier. Random noise is one of the most important factors that affect a receiver network's ability to process low-amplitude signals. In particular, it is a critical figure-of-merit for the performance of receivers, since it determines the minimum signal level that can be detected. The design of a low-noise preamplifier stage that follows the receiver is therefore an important technique to enhance the performance of the receiving system. Low-noise design from the system designer's viewpoint is concerned with the following problem: given a sensor with known signal, noise impedance, and response characteristics, how do we optimize the amplifier design to achieve the lowest value of equivalent input noise? In the report, some basic knowledge of noise and the methodology of designing a low-noise amplifier will first be described. Then a study on the noise characteristics of a basic IC amplifier and a low-noise amplifier will be done. The improvement of noise performance by cascading the low-noise amplifier in front of the basic IC amplifier will then be investigated. The effect of source resistance on noise performance and the noise figure will also be evaluated. Both simulation using Pspice and actual measurement in laboratory will be conducted and the results will be compared.
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