Low Noise Amplifiers
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One of the key building blocks in a receiver path of a cellular or wireless system is a low noise amplifier. This circuit must increase the signal level while hardly increasing the signal-to-noise ratio of the incoming signal. These two tasks are not always easily achieved, mainly because noise impedance matching and input impedance matching are not always obtained for the same source impedance. The aim of this chapter is to explain the design steps required to design a low noise amplifier in various technologies.
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© 2003 Kluwer Academic Publishers
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(2003). Low Noise Amplifiers. In: Circuit Design For RF Transceivers. Springer, Boston, MA. https://doi.org/10.1007/0-306-47978-8_3
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DOI : https://doi.org/10.1007/0-306-47978-8_3
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IMAGES
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This document discusses low-noise amplifier (LNA) design. It begins by describing the basic function and placement of an LNA in an RF receiver front end. Key considerations for LNA design include noise performance, power transfer, impedance matching, power consumption, bandwidth, stability, and linearity.
Make transistor sizing part of the noise matching step. Use only reactive (loss-less) feedback or minimize the noise contribution of resistive feedback components.
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