qrsstxrx : Message: Re: commutative mixers

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commutative mixers

Message #72 of 100 |

Re: commutative mixers

> One thing I do think would be very informative is some kind of
> performance evaluation - preferably including IP3. I remember reading
> about a good way to do this but I don't remember where :-(
>
> 73 Hans G0UPL

Searching the net:

Apparently there is a rule of thumb that says the third order
intercept is 10 to 12 dB above the 1dB compression point:

http://www.rfcafe.com/references/electrical/p1db.htm
http://www.arrl.org/qex/2006/09/qx9letters.pdf

Mike
KL7R

PS
Here are some docs I found on measuring third order intercept

http://www.downeastmicrowave.com/PDF/IP3.PDF#search=%22calculate%20third%20order\
%20intercept%22
http://www.sm5bsz.com/dynrange/intermod.htm
http://www.odyseus.nildram.co.uk/Systems_And_Devices_Files/Linearity.pdf#search=\
%22calculate%20third%20order%20intercept%22

Mon Sep 11, 2006 8:55 pm

"kl7r" <kl7r@...>

kl7r

Offline

Message #72 of 100 |

Expand Messages	Author	Sort by Date
Hi all. I realise that the ideas behind my designs might not be obvious, so I have written some notes on my understanding of commutative mixers - ...	tigger g4oep	Sep 9, 2006 5:41 pm
Hi Andy, I read your new page, thanks for putting in the effort to write these notes. I think I understand most of it but I probably still need to re-read it a...	Hans Summers hanssummers2000	Sep 11, 2006 4:36 pm
... Searching the net: Apparently there is a rule of thumb that says the third order intercept is 10 to 12 dB above the 1dB compression point: ...	kl7r	Sep 11, 2006 9:03 pm
... http://www.downeastmicrowave.com/PDF/IP3.PDF#search=%22calculate%20third%20order%20intercept%22 ... ...	tigger g4oep	Sep 14, 2006 10:22 am
... This makes nonsense of the claim of 54dBm for 'our' mixer since 42dBm is 15.8W, or 40v pk into 50 ohms. This mixer cannot possibly be linear beyond an...	tigger g4oep	Sep 14, 2006 10:32 am
... looking at the philips data sheet for the sa602, this difference is almost exactly 12dB Andy...	tigger g4oep	Sep 14, 2006 10:56 am