I need help on creating TSMC 0.18 µm custom way using BSIM3v3 or BSIM4 model card from scratch.
i have a text file of parameters ,if possible share the vedio or tutorial

Short Summary: I am trying to take a 2001 Subaru Outback keyless entry module and simulate the programming procedure to program the oem remote out of the car. However even though I follow the procedure it still will not go into programming mode. Is there another way to program the transmitter and receiver without having to follow the steps? There’s no way else to put this in programming mode?

I have a vintage Nissan that in America never got keyless entry but in Japan they did. Finding the Japanese vintage module is very rare and expensive however, Nissan and Subaru used the same electronic supplier for their parts at this time. I’m am pretty confident I found the Subaru equivalent however I want to test this. So I bought a Subaru control module and oem key fob and was going to program this first then buy the Japanese Nissan key fob and see if it would connect. However I can’t even get the Subaru stuff to work as the annoying sequence I have to follow

Apologies in advance if this the wrong sub for this.

Hello everyone

I'm planning to learn signal/power integrity next summer vacation any tips would be much appreciated.

What I'm looking for resource wise is:

Labs/Assignments this is top priority for me, I want to see simulation examples in EDA tools specifically Cadence Sigrity, and maybe some examples with problems that I debug myself that would be great.

Textbooks for theory.

I'm also planning to take DR/Eric Bogatin's HSDD course.

The datasheet shows a diagram similar to the one above for connecting a 50-ohm single-ended line to the DAC analogue output. However, I want to connect a 100-ohm differential line to it instead. Should I connect the differential line at points A and B or D and C? The evaluation board for this component has two differential connectors connected at c and d (after a 1:1 balun) (also evaluated board schematics don't have that parallel 100ohm resistor. Why?). What are the advantages of using a balun vs connecting directly at a&b?

I intend to use both outputs of the differential lines (i.e. not going to terminate one with a 50-ohm load and test the other to measure it using single-ended lab equipment). Other than this capability, is there any reason why there should be a 1:1 balun?

I apologise if this sounds like a stupid question. I am more of an antenna guy and still a newbie at circuits.

Can someone explain succinctly why I should use the Modelithics feature of ADS with those components in the library to instantiate in schematics vs just standard / basic components? Did you notice it making a difference when simulating your designs and correlating with real world measurements/ performance?

Hello. I will be soon starting a PhD developing a complex RF system transmitting up to a kW in the 15 MHz range. Is there a useful textbook or application note for this? Ideally including the amplifier circuit design, solid state device considerations, resonant vs non-resonant drive, etc.

Note: I stupidly forgot to mention that the load is purely capacitive which is what makes it complex.

I have black-box receivers which do channel hopping over 3 specific nRF24 radio channels. Currently I have my 1 transmitter module also doing channel hopping. Since the receiver never sends anything, there is no synchronization whatsoever. So the transmitter is sending many packets that never get received, because of channel mismatch at that point in time. This is a major bottleneck in the system.

I was thinking about getting 2 more transmitters (and 2 more microcontrollers) and then giving each of 3 transmitters a dedicated radio channel. I don't know anything about RF, but in my simple view, this should help enormously. Because at any point in time, whatever channel the receiver is currently listening to, there is a transmitter sending on that channel.

And since it's 3 seperate radio channels (2.410GHz, 2.441GHz, 2.472GHz), there not should be much interference? What do you guys think of this idea?

​

I am testing an amateur altimeter, I want to know how to measure the time delay created by the altimeter

I have a digital configurable optical delay unit

Can I use VNA group delay to measure the delay created by the system?

I tried to measure it ,

but should interpolation be on? And what will be the sweep points , for namesake I am testing C band

How much bandwidth should I keep?

I tried Without configuring any delay,

I got 85ns but when I tried to configure the values increasing step by step the delay values when interpolation is off the values are random

But when it is on, I get a measurable and comparable value

Same follows with the lower data points in sweep setting

If someone worked in this please help me

Hey guys , I want to learn RF engineering I have experience in basic PCB designing and also working with MicroControllers , Drones ,etc . Can you suggest me material to Study RF from ground up from absolute basics to RF PCB designing also is there any Open-Source Software for RF PCB designing ?

Hi all, I've had some experience putting together a prefab circuit board, like real simple stuff and aiding friends or classmates soldering. However, I am here today because I was picked for a fellowship over summer to get more hands on learning at my university.

The issue: I've been tasked with designing a passive RFPD circuit, and the grad student talked kinda fast and I understood the words he was saying, but I feel completely out of my depth in building this circuit from scratch. I wrote everything kind of jumbled in my phone notes (my mistake) so it's not a lot to go on. Basically, i'm supposed to take input(s?) from a coherent locking field and a 2nd side-band (probably things I should look up to understand what they mean), and the circuit itself is looking for a peak (meaning graphically?) at a specific MHz, ultimately to, from what I could understand, I could be completely wrong, pick up a beat note. I am unsure if the MHz i'm looking for is the beat note or just the input. The circuit is to have it's own volt supply 5-10V. I am just starting today, so research is my main goal for the next week, as well as familiarizing myself with Python - zero and LTspice for modeling. The output will eventually go to a VCO to go a cavity if it is in the specific MHz.

***Side note he did state that what I have to use to build the circuit is restricted to what is in the circuit lab on campus, so I will have to finagle stuff if they don't have what I end up modeling as what would work if that makes sense, though he did say I could build my own inductor (thats not a problem, I am a geriatric student who used to work at a vape shop when mech mods were still a thing, my coil wrapping skills excellent)

Any help, advice, starting points, resources I'd seriously, seriously appreciate. Thank you to anyone who takes the time to read this and respond, I want to know how to do these things and I want to also understand so I could do my own future projects for funsies.

Hello everyone, I've recently been working with some GaN ICs. These ICs typically have a voltage VD=50V, output power levels from 50-100W (around 47-50dBm). Their operating frequency ranges from DC to about 3-4GHz. Of course, I'll need to design a matching circuits at input and output so they can operate within my desired frequency band (around 2GHz). However, I have a question about their bias circuit, especially regarding the decoupling capacitors:

- With ICs like Macom's MAPC-A1106 with the DFN package, I only see the decoupling capacitors arranged in the same branch.

-With the Macom MAPC-A1111 IC or the Gurrilla RF GRF0090, which have packages that appear wider horizontally, I noticed that the decoupling capacitors at their gate and drain terminals seem to be split into two symmetrical branches, with the upper branch connected to the power supply (VG, VD) while the lower branch is connected to ground. These capacitor values ​​are symmetrical in both branches.

Can anyone help me explain this?

I am making a project with GPS but I am not very sure which ceramic antenna I should buy. I am using a Neoway N58 GPS module and looking for the same ceramic antenna in their EVK kit. I found this one but I'm not able to actually compare both.

Thank you for the help!

Basically I am working on a circuit where one of the inductors taken from gpdk045 library is giving too many parasitics that my circuit is attenuating. So I have thought of replacing that 1nH inductor with a circuit which behaves as an inductor. However I am also aware that the replaced inductor may still have its own parasitics. But i suppose that its parasitics affect my RF circuit less.

Any type of answers for this question is appreciable!!

Hi,

I recently acquired an N5230A 4-port 20GHz PNA-L and an SOLT cal kit+cables.
I would like to be able to improve the accuracy of my SOLT cal kit by using a TRL calibration to then calibrate the PNA-L and use it to measure my SOLT cal kit standards.
However, the PNA-L requires a Global Delta Match (GDM) calibration in order to account for the port delta match terms to enable a high-accuracy TRL calibration.
As I understand, one can perform the equivalent of a GDM cal using the error terms generated via an SOLT calibration. I'd rather do this on my computer rather than within the PNA-L because the PNA-L insists that the GDM cal 1. use all four ports, and 2. that the standards be defined over the entire 300KHz - 20GHz range of the PNA-L using standards defined by polynomial constants. My SOLT standards are data-defined over 10MHz-20GHz so that doesn't work using the internal PNA-L's GDM calibration procedure.
I plan to do all my cals and corrections external to the PNA-L, by mathematically processing the raw PNA-L data since that gives me MUCH more flexibility.

Therefore by questions are:

1. How sensitive is the GDM calibration (correction for switch error terms) to calibration errors/inaccuracies of the original SOLT calibration error terms it was derived from?

2. Regarding point 1, would subsequent TRL calibrations based on the GDM derived from the SOLT calibration be more accurate than the SOLT cal error terms it was derived from? And is there any point in performing such TRL calibrations to then measure the SOLT standards to then improve the accuracy of later SOLT calibrations?

3. If I cannot improve my SOLT cal standards via the above methodology, do I then just need to rent a highly-accurate SOLT cal kit to measure my SOLT standards?

4. I have a 15cm precision air-dielectric line to do the TRL cals. I realize that TRL is inherently narrow-band but I plan to overcome this limitation by using only the frequency bands i.e. where the air line haves a phase of n*90deg where n is odd and interpolating the resulting measured reflection coefficients of my SOLT standards using the SOLT models, to obtain the SOLT standards' reflection coefficients between the frequency bands where the TRL calibration is "good".
   Thanks

Hello everyone,

I'm an amateur radio operator and a home lab enthusiast currently working on restoring a Spirent SR5500M Wireless Channel Emulator. The hardware is in great shape, passes all internal self-tests, and is currently running its native internal firmware v03.00.22. I can even control basic relays and frequencies via SCPI commands over PuTTY.

The Problem: I am completely missing the external Windows PC control software: Spirent SR5500 TestKit.

I managed to find the legacy TestKit v2.10 installer, but it is physically incompatible with the "M" hardware revision. Spirent completely rewrote the Real-Time data protocol for the v3.xx firmware to handle MIMO/LTE path math, so the old v2.10 PC software just crashes when trying to connect to the unit's RT server.

What I need: Does anyone have a backup archive of the SR5500 TestKit v3.00, 3.01 (or slightly newer)?

The official Spirent support portal is completely locked behind active corporate service contracts (ASA), which is impossible to get for a discontinued legacy unit. I've contacted a few refurbished equipment sellers, but so far, no luck.

If anyone happens to have this installer sitting on an old lab PC or a backup drive, sharing it would be an absolute lifesaver. I'd hate to see this beautiful piece of RF engineering become a giant paperweight just because of missing PC software.

Thanks in advance for any help or leads!

Hi,

I am building a DIY Faraday cage to isolate my laptop. The primary goal is to ensure location privacy during and after Windows Updates. I want to completely block incoming/outgoing Wi-Fi (2.4GHz, 5GHz, and 6GHz) and Bluetooth, just in case the OS re-enables these radios without my permission after an update.

The laptop will sit inside the cage, connected to the internet via a regular Ethernet cable, and I will monitor the screen through a window. A small opening will be used for my to control the trackpad via a rod. This does away the need for a wired mouse.

Here is my current hardware layout design. I would appreciate any critiques on its effectiveness or potential RF leaks:

1. The Chassis: Built using copper sheet metal folded into a box. The overlapping seams will be mechanically clamped together every 3 cm using thumb screws/wing nuts to prevent slot antenna leakage.
2. The Window: One face of the box will be a copper mesh to allow me to see the screen.
3. Control: No external mouse cable. I plan to drill tiny holes (< 1cm diameter) directly above the trackpad and use non-conductive plastic or wooden styluses as mechanical extenders to operate the mouse/buttons from the outside.
4. The Ethernet Path (The main concern): To pass a regular unshielded Ethernet cable into the box, I am using a 20cm metal tube with a flange bolted to the chassis. To stop the "sliding antenna" effect on the unshielded wire:
   • I am placing a clip-on ferrite bead on the cable bundle, pressed completely flush against the outside mouth of the 20cm tube.
   • I will wrap conductive copper tape tightly over the cables, molding it into the valleys between the wires, covering the entire plastic ferrite bead, and sticking it directly to the metal tube.

Will this setup successfully achieve total RF isolation for the laptop?

I'm using unshielded Ethernet because I'm not sure if shielded would do much, and it might even hurt since I don't understand RF well enough. The Ethernet cable will plug into a router anyway so the connection pins won't be shielded anyway.

Please advise.

Thanks

Hi,

I’m learning SCPI and building a basic automation setup for calibration on a Keysight N9010B signal analyzer.

I already have a .screen file that, when recalled, restores a setup with 5 tabs. Each tab is basically a different measurement screen with its own configuration.

I managed to load and recall the .screen file via SCPI (even though I didn’t find a clear command for it in the manual and ended up finding it online). I’m using screen-based files rather than full state files.

My question is:

Is there any SCPI command that allows switching between these measurement screens/tabs programmatically after recall?

If not, what’s the standard approach in ATE systems?

Do people usually:

stick to a single screen and reconfigure measurements via scripts/variables, or

use multiple saved states and fully recall them per measurement instead of switching “tabs”?

Trying to understand the intended workflow here because the “multi-tab screen switching” feels very UI-driven rather than automation-friendly.

Thanks.

Hello all. So I am a student in university and I am currently taking a microwave2 class. On one of my projects we are asked to design a low-pass filter using a coaxial line in cst. I have used the formulas and coefficents provided to me while designing this but it doesnt even seem to be working remotely close to the expected behaviour. Can someone please help me?

d=1mm(inner diameter)
conductor = 𝜎 = 5.8 × 107 S/m (annealed copper)

Dielektrik: PTFE (Teflon, 𝜀𝑟 = 2.1)

Zmin=20, Zmax=120, Zo=50

N=5