The noise temperature of a receiver front end is measured with matched hot and cold…

PHYSICS · Multi-part · Fermi University Physics · Electronics, Instrumentation & Communication · Feedback, operational amplifiers and analogue signal processing · Feedback, operational amplifiers and analogue signal processing

Inside the Instrument, Ch Low-noise front ends and noise measurement

Problem

The noise temperature of a receiver front end is measured with matched hot and cold loads at

T_{\rm hot} = 300\,\mathrm{K}

and

T_{\rm cold} = 90\,\mathrm{K}

. The measured power ratio (Y-factor) between the hot and cold measurements is

Y = 1.80

. ((a)) Find the amplifier's equivalent noise temperature

T_e

. ((b)) Express the result as a noise figure in decibels, referred to the standard

290\,\mathrm{K}

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