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Stimulus Amplitude VNA E5062A - RF Cafe Forums
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Post subject: Stimulus Amplitude VNA E5062A
Posted: Fri Dec 18, 2009 7:20 am
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Joined: Tue Dec 15, 2009
10:22 am
Posts: 9 |
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Hello
I would like to know if it is possible
to choose the amplitude of the stimulus signal in
an Agilent E5062A Vector Network Analyzer.
I know I can choose the power (at least a range),
but how can I know the amplitude of the signal?
can I choose it?
Thank you very much.
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Post subject: Re: Stimulus Amplitude VNA E5062A
Posted: Thu Jan 07, 2010 7:20 am
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Joined: Tue Dec 15, 2009
10:22 am
Posts: 9 |
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Can't anybody help me?
Can't I determine
the voltage of the stimulus signal?
Thanks
again.
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fred47 |
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Post subject: Re: Stimulus Amplitude VNA E5062A
Posted: Fri Jan 22, 2010 11:56 pm
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Joined: Wed Feb 22, 2006
3:51 pm
Posts: 113 |
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Given the power and the S11 of the device under
test, you can calculate the voltage at the input
port.
While I don't have the specifications
for the E5062A, usually VNA power level adjustability
is limited, so you may not be able to reach the
voltage you want.
Why is voltage so important,
if you know the power?
Good luck!
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Post subject: Re: Stimulus Amplitude VNA E5062A
Posted: Mon Jan 25, 2010 6:31 am
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Joined: Tue Dec 15, 2009
10:22 am
Posts: 9 |
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That's the problem: the power cannot be perfectly
determined, but just 15dB-wide power ranges can
be chosen.
I want to know Vin because I'm
interested in obtaining the voltage transfer function
and the output voltage.
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fred47 |
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Post subject: Re: Stimulus Amplitude VNA E5062A
Posted: Mon Jan 25, 2010 1:22 pm
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Joined: Wed Feb 22, 2006
3:51 pm
Posts: 113 |
"Voltage transfer function" by itself is not completely
meaningful at high frequencies. One classic
definition is Vout/Vin, when driven from a voltage
source, and driving into an open circuit. This can
often be approximated at low frequencies (audio),
but even there, you must be careful not to make
your measurements inaccurate. Both a pure
voltage source and an infinite impedance load are,
at some point, impossible to obtain and still be
useful. For example, an active oscilloscope probe
with 0.5 pF input capacitance still has an input
impedance in the hundreds of Ohms at 1 GHz.
If you're using a VNA, you have a 50 Ohm source
and a 50 Ohm load. You may be able to compute the
voltage transfer function mathematically - but I'm
not sure which constraints are important to you.
The information is "hiding" mostly in S21, but needs
compensation for S11 and S22, probably. Our host
here at RFCafe has posted a complete set of equations
for various conversions to and from S-parameters
at
http://rfcafe.com/references/electrical/s-h-y-z.htm
You'll need to identify what you really need,
either as a Z-parameter, H-parameter, or Y-parameter.
Good luck!
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Posted 11/12/2012
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