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Mixer return loss

Question asked by mingal on Sep 19, 2006
Latest reply on Sep 25, 2006 by mingal

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Hello all--

Say I have a mixer like the one in the attached *.wsx and I want to look at return loss on the RF, LO, and IF ports.

How do I do that?

Mark

[file]mix_00c.wsx[/file]

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mix_00c.wsx256.7 KB

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SERGEYTRU Sep 22, 2006 6:12 AM
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You may use Harbec function "hb_LargeSmix"

RetLossLO = db10(hb_LargeSmix(VLO,VPORT[3],1,FreqIndexIM,[0;1]))
RetLossRF = db10(hb_LargeSmix(VRF,VPORT[1],1,FreqIndexIM,[1;0]))

where
    VLO = 2*sqrt(2*dbmtow(PLO)*Z0)
    VRF = 2*sqrt(2*dbmtow(PRF)*Z0),
    Z0 - port impedance (50 Ohms here),
    PRF, PLO - RF and LO powers, dBm

[file]mix_00c.wsx[/file]
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- mix_00c.wsx256.7 KB
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SERGEYTRU Sep 22, 2006 9:44 AM
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"
You may use Harbec function "hb_LargeSmix"

RetLossLO = db10(hb_LargeSmix(VLO,VPORT[3],1,FreqIndexIM,[0;1]))
RetLossRF = db10(hb_LargeSmix(VRF,VPORT[1],1,FreqIndexIM,[1;0]))

where
VLO = 2*sqrt(2*dbmtow(PLO)*Z0)
VRF = 2*sqrt(2*dbmtow(PRF)*Z0),
Z0 - port impedance (50 Ohms here),
PRF, PLO - RF and LO powers, dBm
"

By the way, the function may be used to calculate mixer conversion losses (from RF to IF port, IF port number=2 in the circuit)

For FIF = FRF+FLO:

ConvLossUp = db10(hb_LargeSmix(VRF,VPORT[2],0,FreqIndexIM,[1;1]))

For FIF = FRF-FLO
ConvLossDown = db10(hb_LargeSmix(VRF,VPORT[2],0,FreqIndexIM,[1;-1]))
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mingal Sep 22, 2006 1:09 PM
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Oh, yeah!!

That is SWEET!!

Thanks, Sergey!
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SERGEYTRU Sep 23, 2006 3:50 AM
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Mark,

I need to do one correction: the function returns voltage ratio, and to get it in dB all the formulas must use db20() function instead of db10(), which I used here (results will be 2 times more in dB).
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mingal Sep 25, 2006 3:36 AM
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Thanks, Sergey.

erm... I have another question...

Where should I go to locate this (and presumably, other) functions and their uses?

Mark
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pkarasev Sep 25, 2006 3:58 AM
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Hi Mark,

Take a look in Help -> Contents -> Simulation -> HARBEC -> HARBEC Analysis functions. The functions specific to Harbec are listed there; for the more generic functions, take a look at the "Using Equations" section in the User's Guide book. The doc can certainly use some improvement and more examples, but the information on the functions and their parameters is there.

Regards,
Peter K.
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SERGEYTRU Sep 25, 2006 4:00 AM
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Mark,

Most of Harbec functions described in GENESYS Help:

/Simulation/Harbec/HB(Harmonic Balance) Analysis/Harbec Analysis Functions

/Simulation/Harbec/HB(Harmonic Balance) Analysis/Basic HB Analysis Measurements
using them you can find also in others paragraphs of the chapter:

/Simulation/Harbec/HB(Harmonic Balance) Analysis

Some of new Hrabec functions may be not documented while, but you can look actual their implementation, including definition of their parameters

(see Mark Zachmann post:

https://edasupportweb.soco.agilent.com/pls/portal/support.show_topic?id=2404)

"
Try this...

Click the Add button in the workspace tree (or right-click) and pick From Library.... Switch to Equations libraries and select Eagleware Functions. You'll find wave2spec in the list and you can double-click it to embed it into the worskpace. There you can actually see the code and the comments.
"
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mingal Sep 25, 2006 4:08 AM
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Heh.

I typed into the help index "hb_LargeSmix" and got *nothing*.

Anyway, it's good the *we* now know about this... what about *them*? (Your other customers?)

:?
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SERGEYTRU Sep 25, 2006 4:58 AM
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You are right, we need reindex the Help to include all the functions names into the Help keywords list.
Thanks for good tip!
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mingal Sep 25, 2006 7:06 AM
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Sergey, it is good to virtually meet you.
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