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Practical Considerations for Low Noise Amplifier Design ...
1 Freescale Semiconductor, White Paper Rev. 0, 5/2013 Practical Considerations for Low NoiseAmplifier DesignBy Tim DasFreescale Semiconductor Freescale Semiconductor, Inc., 2013. All rights 0, 5/2013 Freescale SemiconductorWhite PaperPractical Considerations for Low Noise Amplifier Design 2 Freescale Semiconductor, White Paper Rev. 0, 5/2013 INTRODUCTIONLow Noise amplifiers (LNAs) play a key role in radio receiver performance. The success of a receiver s Design is measured inmultiple dimensions: receiver sensitivity, selectivity, and proclivity to reception errors. The RF Design engineer works to optimizereceiver front end performance with a special focus on the first active paper considers device and board level variables that affect LNA performance and confront the engineer at each level ofdesign in accommodating the various requirements of specific applications. To illustrate the Practical challenges, performancetrade offs for three popular LNA topologies and two process technology implementations are examined.
directly affect receiver sensitivity: noise figure, gain, bandwidth, linearity, and dynamic range. Controlling these characteristics, however, requires an understanding of the active device, impedance matching, and details of fabrication and assembly to create an amplifier that achieves optimal performance with the fewest trade−offs.
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