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I can open the file and see the sub-circuit definitions. I can also use LTSpice to automatically generate a symbol for the top-level sub-circuit listed in the CDL (the CDL file states what the top-level sub-circuit is). When I generate the symbol, there are 200 pins created based on what's...
I have a CDL file that I'd like to simulate, but I am not a digital designer and do not have access to the tools like Virtuoso or Synopsis.
What I do have is LTSpice. Is it possible to simulate the CDL in LTSpice?
The CDL has 400+ .SUBCKT statements which would be crazy to try to import 1-by-1...
I'm new to ADS and am trying to get the hang of it by revisiting some basic MW designs like Wilkinson's, Lange's, and branchline's.
Are there any good tips you can suggest to help make this MWO to ADS transition less painful??
I'm starting with ideal Tlines and working to complete EM layout...
I'm still novice w/ ADS and I find it difficult to believe that the tool can be used for a full RF PCB.
Recently, I've been putting together a lot of RF PCBs, but am using Mentor Graphics Expedition and trying to use good microwave judgement / rule-of-thumbs for the layout. I can import the...
What effect does an amplifier have on the phase noise? and What effect does a mixer have on phase noise?
This is a general question assuming that the amp and mixer are ideal.
ie: if my PN is -80 dBc/Hz before a 20 dB amp, does the PN get amplified to -60 dBc/Hz?
ie: if my IF and LO both have...
Yes, that's using Pb/Sn. Im not sure about Ag solder. I would imagine the gold would still leach to an extent, but you would have to look into the effect Ag/Au have on each other (aka dissimilar metals interaction)
Thanks, Biff44.
So are there options to mitigate the embrittlement?
Also, I've done a few things with immersion silver where I was fighting for every 0.1dB. Silver tarnishes quickly, have to use solder or silver wirebonds, and I litterally only got a few tenths of a dB out if it. Perhaps if the...
I'm a designer having a discussion with a coworker who's background is PCB manufacturing.
On our PCB fab drawings we call out IPC-6018 with an ENIG finish and I questioned him on why we aren't using electrodeposited Ni/Gold.
He replied that we only use SMT chips (no wire-bonding) and the...
That is what I thought. And to be clear, the 100 ohm diff pair would be connected to the side of the balun with the higher turns ratio? And no resistor is needed for termination on either side of the balun?
I have a RF switch that I would like to select between two clocks (125MHz and 150MHz). The clocks are both LVPECL signals, 100ohm diff pairs. The SP2T inputs are 50ohm single ended.
Can I use a balun for the Diff to SE transform?
What kind of termination would I need on the diff pair side? 100...
Look at EMC Power Samplers. http://www.emc-rflabs.com/Passive-Components/Couplers/Power-Samplers
Technically, they are resistive taps.
Are you specifically looking for a directional coupler? Getting down to 225MHz will be a challenge for any directional coupler, as I'm sure you know.
I have typically done microwave assemblies which are then hermetically sealed, so I did not have any reason to conformal coat any RF. Now I am working on a set of RF PCBs which are going into a housing, but it is in no way hermetic. I won't be dealing with salt fog, but I will be dealing with...
Has anyone used conformal coatings on their RF boards? If so, what were your frequencies min/max? Did you have filters and what were those topologies?
Has anyone used Paralene as a coating??
Thanks
Hi everyone.
Hoping someone has the time to explain this to me.
After taking an N-point FFT, I'm left with the Fourier Coeff's of each frequency bin and can calculate the fequency with a little math. No problem. But if I try to reconstruct the original signal, it always seems to be shifted in...
Do you have documentation on how you created that Taylor algorithm? I've been looking for a long time to get a solid reference on how to compute those coefficiants in Matlab.
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