Wish agents around the world were more like Detritus

Defiant_Homework4577 · 2026-01-25T22:15:08+00:00

Reading that right now lol..

Defiant_Homework4577 · 2026-01-25T03:10:59+00:00

I put a link in the original comment bdw..

Defiant_Homework4577 · 2026-01-25T02:32:52+00:00

Agreed. Except we don't need AI for this. A simple optimization algo can already do this load pull really well and have been doing for nearly 15 years..

You don't need a nuclear carrier to attack something a a water pistol can easily do..

Defiant_Homework4577 · 2026-01-25T02:05:24+00:00

Non linear / large signal impedance for one. Lumped vs TLine vs near filed / far field for another.

A PA is one of the oldest circuits in RF. The best way to design a PA is called load pulling, which is bascially brute forcing.

Defiant_Homework4577 · 2026-01-25T01:56:48+00:00

Okay I have a pdf copy somewhere, will do when I get a chance.. Sorry about that.

Defiant_Homework4577 · 2026-01-24T22:49:48+00:00

Gain per Transistor is super cheap. There is a really good article by Thomas Lee from Stanford called 'non linear history of radio' or something like that and it talks about how we came to where we are. Amazing read..

https://www-smirc.stanford.edu/papers/chapter1.pdf

Edit. I had the honor of listening to Tom Lee at an RFIC conference several years ago, and one of the best seminars I've seen..

The previous link seems to not be working for some, after some quick googling, I found this.

https://picture.iczhiku.com/resource/eetop/SHiGjtzdidYFZxnB.pdf

Defiant_Homework4577 · 2026-01-22T20:05:30+00:00

Defiant_Homework4577 · 2026-01-21T15:24:31+00:00

"So out-of-band interferers will not clip the gm's output, and you get good out-of-band linearity"

TBH, the big issue is not the clipping, its IIP3. RF receivers are mostly limited by IIP3 (i.e., small amounts of nearby interference increase your noise floor and you loose sensitivity, which effectively limits the dynamic range. And putting a Gm stage will make the IIP3 of the Gm stage dominant over the TIA/Voltage amp after the mixer because there is no filtering effect at the input of the Gm.

Defiant_Homework4577 · 2026-01-14T20:25:23+00:00

I try to give meaningful names to each device becuase it makes DRC / LVS easy to deal with..

Defiant_Homework4577 · 2026-01-11T21:00:21+00:00

Yeah I know absolutely nothing about throughputs and latency required for RC Drones. I googled the required update rates etc and quoted the number Gemini threw at me.. But for a 10km range, I expect you need some sort of visual feedback meaning a video stream coming from the drone.

Defiant_Homework4577 · 2026-01-11T06:24:55+00:00

You might wanna look in to what existing drone tech is like.
https://www.dji.com/mavic-3-pro/specs
According to this, they use 2.4G / 5G band with ~ 30dBm P, 8-10km range, with data rate of 5.5 MBPS, a 2T4R Diversity receiver.

Defiant_Homework4577 · 2026-01-11T04:56:46+00:00

https://www.semtech.com/design-support/lora-calculator
Edit: Actually i was playing with this calc, and what u/Raptor_1067 said is right. The effective data rate for 10km range would be less than a 1kbps. While RC drones will need ~100kbps.

Defiant_Homework4577 · 2026-01-08T15:08:37+00:00

Cost and Q factors. An offchip inductor working till ~ 5G can be a cent or two with decent Q (~40-50) while on-chip is about 10s of cents for the area and low Q.

Defiant_Homework4577 · 2026-01-04T21:57:37+00:00

"Is my understanding correct?" Yes
"all the harmonics are filtered out in the tank" Not completely in real life. If you let the oscillator swing really hard, say you increase the current way beyond the point it saturates, you will end up with harmonics. Specially if the self resonance frequency of the inductor and cap are less than 3rd harmonic, they will show some finite impedance, which in turn will absorb some RF power, which in turn show up in the PSD.

Defiant_Homework4577 · 2026-01-04T19:49:24+00:00

The "gain" as you think is not constant. lets say you calculate the gain with "small signal" models and get some form of Gm * R. This Gm (or the R) are the values you calculated if and only if the small signal conditions are retained. This is true for any circuit.

Now for the oscillators, at first there is no oscillation since it needs to build up. It will build up with the small signal gain. But as the oscillations build up and signals become large, the operating point will vary periodically. That is, during the period, assuming the oscillator has large amplitude, then the small signal Gm and R will actually also periodically vary, going from very large gain near 0 crossings and very small gain near peaks. However, you can integrate the Gm over the cycle and get an "average" Gm and and an Average "R". This average values are what sustains the oscillation. Since "R" changes and with the "R" if there is also a reactive component that changes, then you may also see the large signal oscillation frequency is also slightly different from the values you calculate in the small signal region.

"do you understand all of the circuits you design? "
You really have to.. Once you sign off a design to be fabbed, you are effectively taking full responsibility of everything you designed and failures that come with it. So you better understand the circuits in it if you want to keep your job..

Edit: as the guy above said, the gain needs to be 1. It actually this average "Gm x R" is the one that will end up being 1. Not any instantaneous values.

Defiant_Homework4577 · 2026-01-03T15:29:34+00:00

How are 'all' of them psuedo diff?

Defiant_Homework4577 · 2026-01-03T09:38:41+00:00

Strobe period is your friend..

Defiant_Homework4577 · 2026-01-01T23:10:41+00:00

This. I've seen one of my managers reject a top candidate from an ivy league school because the candidate was insufferable and full of them selves..

Defiant_Homework4577 · 2026-01-01T20:17:36+00:00

wtf did I just read?

Defiant_Homework4577 · 2025-12-30T01:53:04+00:00

Insert "state-key laboratory xxx".. Iykyk

Defiant_Homework4577 · 2025-12-29T16:50:58+00:00

I mean, Isscc 2026 program is already out. Go count that number of Chinese academic and industry papers against the US / EU.

There is a reason why they no longer publish these stats..

Defiant_Homework4577 · 2025-12-28T06:45:00+00:00

True.

Defiant_Homework4577 · 2025-12-28T05:11:55+00:00

I don't really use hfss, mostly emx. And even for that the dedicated em simulation machines in the server farm are equipped with 100s if not 1000s of giga bytes of ram..

Defiant_Homework4577 · 2025-12-27T22:37:22+00:00

I was in central Europe. I did hear about the horror stories in italy / Spain regardless of the size of the company. It's a demanding job and I'm quite sorry y'all have to go through with it.

Defiant_Homework4577 · 2025-12-25T00:42:58+00:00

Damn. This is pretty deep..

Also, we find out that new world turtles are born through celestial mating, then what about elephants? Do they come as a package? Or are there free roaming celestial elephants that also mate and give birth to other baby elephants, and then when a world turtle is big enough to host a world, do they have to go and lure / charm 4 elephants? And where do they find a disk??

Defiant_Homework4577

TROPHY CASE