HP a-110 free download

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HP Archive This vintage Hewlett Packard document was preserved and distributed by www. hparchive.com Please visit us on the web ! On-line curator: Glenn Robb This document is for FREE distribution only! Mixer Noise Figure Concerns and Measurements Ed Cantrell Oct. 1984 RF &.. Microwave Measurement Symposium and Exhibition rhO- HEWLETT ~~ PACKARD www.HPARCHIVE.com Why Is Noise Important? Receiver System Small Imperfect Signal Noisier Signal Device or System Noise limits the detection of weak signals. As a signal is passed through a device or system, noise is added, thus degrading the signal to noise ratio. Noise figure is a measure of this degradation. 1 www.HPARCHIVE.com Noise Figure Definition Total Output Noise Power F Output Noise Power Due To Input Noise @ 290K kTsB ~ No Na + kTsBG r-----O_---4!Na~>------o= ..> V" .. Zs @ Ts ..: -==- Na + kTsBG F kTsBG Ts 290K FdB 10 log F Noise figure is a measure of signal to noise ratio degradation of any device or system that has at least one input and one output. It applies to systems as well as components of the system. 2 www.HPARCHIVE.com Why Is Mixer Noise Figure Important?