Thread: Is a VNA the correct equipment instrument to measure the BW of a LNA


Permlink Replies: 2 - Pages: 1 - Last Post: May 23, 2012 3:32 PM Last Post By: Metatron
robismyname

Posts: 5
Registered: 05/20/12
Is a VNA the correct equipment instrument to measure the BW of a LNA
Posted: May 21, 2012 5:33 PM
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My question is two fold.

1) I was asked to measure the BW of a LNA (RF2472G). Is this done with a VNA. I have an obsolete model in my lab Agilent/HP 8720ES.

2) Exactly how would you measure the BW of the LNA using the VNA? Is this a S11, S12, S22, S21 parameter? please help.
daras


Posts: 871
Registered: 12/01/05
Re: Is a VNA the correct equipment instrument to measure the BW of a LNA
Posted: May 22, 2012 10:29 AM   in response to: robismyname in response to: robismyname
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you've already asked this question in another post, but the answer is still yes - and the bandwidth is a frequency swept S21 measurement.
Metatron

Posts: 11
Registered: 05/02/12
Re: Is a VNA the correct equipment instrument to measure the BW of a LNA
Posted: May 23, 2012 3:32 PM   in response to: robismyname in response to: robismyname
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By LNA are you referring to Low-noise amplifier? If so, perform an S21 measurement and verify at what frequencies the signal drops off 3dB. The difference between those two frequencies is the amplifier's BW.

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