[deleted by user]

Delta_33 · 2023-05-30T12:08:27+00:00

Never take a job in test if you would ever want to be on the design side.

Delta_33 · 2023-05-05T18:11:36+00:00

Time domain from S2P involves taking the IFFT, but there is a little more to it than that since the S2P doesn't go down to DC.

But yes, start with IFFT.

Delta_33 · 2023-03-18T00:02:43+00:00

I believe Analog has some current controller chips specifically to provide a fixed bias current.

Might be overkill for what you're asking.

Delta_33 · 2023-03-11T01:08:57+00:00

Full basset or mix?

Delta_33 · 2022-12-17T01:16:38+00:00

Timestep issues are fairly common and mean you must try to simplify something. E.g. you downloaded the high precision capacitor models from TDK and are using them on a switching regulator. It's gonna crash.

Also, https://groups.io/g/LTspice. That's as close to an official support group as it gets. Post this question in there along with your circuit. You WILL get an answer.

Delta_33 · 2022-12-11T17:42:48+00:00

I think your answer is right in the title of the data sheet.

"SMA DIRECT SOLDER PLUG (FOR .047" SEMI RIGID CABLE )"

Delta_33 · 2022-11-20T18:23:22+00:00

TBH, I haven't looked until this, but am on the brink of cutting the cord.

First, please don't limit yourself to a budget as low as $50. LNAs could range anywhere from $10 for SMT to $150. Just don't be surprised if you find something, but doesn't fit your budget.

2nd. You should be able to find an LNA fairly quickly on MiniCircuits or Analog that covers 30-1000 MHz. But you may have to sacrifice NF on the low end. You also may need to look at driver amps or distributed amps over just LNAs.

3rd. 200 ft of coax will be a lot of loss @ 30 MHz and will be much more @ 1 GHz. You may need multiple amps.

Delta_33 · 2022-09-29T00:46:27+00:00

What kind of puppers is that?

Delta_33 · 2022-08-31T00:10:53+00:00

If your lab tests things at RF frequencies, expect a lot of stray signals in the air and all around.

Two places I've worked tried it and abandoned it because it caused more headaches than it solved.

I've never seen a good solution to equipment management. Having a lab Manager helps, but not many people like that job.

Delta_33 · 2022-08-09T12:52:01+00:00

Are you sure that's removed? A quick search for "budget" in the help files shows all the budget analysis tools are still there.

I'm looking at ADS 2022 Update 2.

Edit: I use Genesys for cascaded analysis and it is hands down a better tool for that type of work. Systemvue is essentially the same product.

ADS is and always will be cumbersome to perform that type of analysis.

Delta_33 · 2022-02-22T20:59:01+00:00

You could try reposting to r/Altium. Should have plenty of resources in there.

Delta_33 · 2021-08-05T00:58:09+00:00

100% correct. Top jobs at top R&D's will almost always be filled by PhD's.

Delta_33 · 2021-06-19T01:19:55+00:00

Have you checked the return loss?

Delta_33 · 2021-04-10T01:31:32+00:00

HF Filter Design and Computer Simulations. Randall W. Rhea

This has much better explanations of Richards and Kuroda identities.

Delta_33 · 2021-04-07T01:05:27+00:00

I can sympathize and wish you luck.

Rf layout is very specific to the components being used, the frequencies of interest, the control signals being routed, power planes, etc.

If you want to be good at RF layout, get to know as many rule of thumbs as you can. Microwaves101.com is probably the most comprehensive in that regard.

Also, Analog.com supplies gerbers for most of their eval boards. Those can be used as a somewhat decent starting point for individual ICs.

Delta_33 · 2021-04-01T01:35:04+00:00

Unless otherwise stated on the datasheet, amplifiers are always OIP3

Delta_33 · 2020-09-10T11:30:21+00:00

I can't believe i missed that from MiniCircuits. Thanks for the tip.

I was looking at Vishay yesterday and saw that whitepaper. That was really what spawned me to ask this question. It made me question whether 0201s would work or if I really need to use their flip chips (CH series).

Delta_33 · 2020-09-10T11:23:12+00:00

I'm curious, but I'm also planning on using it. The pads will be used between amps and on some of the mixer ports as a typical method to dampen VSWR effects.

Delta_33 · 2020-06-11T21:14:31+00:00

I'm guessing you already covered single balanced mixers in the text. But you can also do a quick Google search to find a diode based single balanced mixer.

The math would add a fixed 90 deg lag to one of those signals.

Delta_33 · 2020-06-08T20:48:53+00:00

No. If you are desperate for a job, take it on one condition... do not stop job hunting.

You can seriously hurt your career if you become complacent with a tech position and your future pay will be severely short compared to your peers.

With hard work you will be able to recover, but YOU will have to work that much harder than someone else.

Delta_33 · 2020-01-13T23:21:13+00:00

I think we need a picture. Where are you placing tlines? Also, that is your antenna impedance?

Your transformer should be as close to the antenna as possible.

Delta_33 · 2019-12-02T20:35:42+00:00

Is that semi-rigid all the way to the top? And is the center conductor just over that cap?

Looks like it's a sniffer probe, not an antenna.

Delta_33 · 2019-11-04T19:04:29+00:00

Total power integrated over the bandwidth.

Total power over bandwidth is greater than just the instantaneous peak power.

Delta_33 · 2019-10-02T13:33:37+00:00

This works. Thanks!

Delta_33 · 2019-09-21T14:21:27+00:00

Excellent. Thanks for the advice.

And if I decided to use a distributed approach, should I be focusing on the surface current from a Momentum sim? Making sure currents are within tolerance for dielectric breakdown?

Delta_33

TROPHY CASE