Noise figure measurement personality guide keysight. An engineer can measure the noise figure over a certain frequency range, and the analyzer can display the system gain together with the noise figure to help the measurement. Agilent fundamentals of rf and microwave noise figure. Noise figure of a receiver or amplifier is a measure of deterioration of the signalto noise ratio, caused by the amplifying device. This chapter introduces you to basic features of the noise figure analyzer, including. The noise source is off when no voltage is applied. No part of this manual may be reproduced in any form or by any means including electronic storage and retrieval or translation into a foreign language without. Using a power meter when use power meter is selected on the select cal method dialog, a power meter is used in place of a noise source to characterize the noise receiver. Preamps are available to reduce the uncertainty of yfactor noise figure measure ments. Calibration for noise figure on amplifiers and converters.
Three methods of noise figure measurement maxim integrated. All measurements should be at least 10 db greater than the noise floor. Lamancusa penn state 1242000 an octave band filter is not a perfect bandpass filter it is. The primary tool for noise measurement is the sound level meter slm. The noise figure calibration process is different depending on if a noise source or a pna source calibrated with a power meter is used to calibrate the noise receiver. Keysight technologies noise figure xseries measurement app. With an optional preamp installed in an xseries signal analyzer or. Model 342a noise figure meter with an appropriate noise source automatically measures and continuously displays the noise figure of the receiver or amplifier to which it is attached.
In the direct method, a spectrum analyzer is used to measure the absolute power of the noise and the. Hp 8970 noise figure meter software browse files at. The if attenuator data is needed to return the noise. In contrast to a noisefigure meter, spectrum analyzer, or network analyzer, an nfa is a dedicated instrument. Its control interface and display are designed specifically for noisefigure measurements. This section explains the noise figure nf by quantifying the noise in an amplifier. The typical dynamic range of meters is 60 db, more is better. Three methods of noise figure measurement tutorial maxim.
The output of the dut is then measured by the noise figure analyzer. Noise figure measurement without a noise source on a. In a linear amplifier, the ratio of the signal to the noise snr is expressed by an index called the noise figure nf. Noise figure measurement methods and formulas maxim integr. The advantage of this method is the simple system configuration, but the disadvantage is the need for a highperformance measuring instrument. Manual measurements which can be made on a single frequency point or. Noise figure analyzers nfa series users guide keysight. Loads the frequency data in the file to the frequency table. The circuit of the broadband amplifier is shown in figure 2. It also discusses a transistor noise figure test, and ssb and.
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