u/electrolitica

Hi! In the context of modern/future RF-sampling systems (6G, SatCom, etc), how important is the flatness of the STF? Could it be reasonably sacrificed in the name of more bandwidth, by using e.g. inductive peaking?

For example, imagine I could extend the bandwidth of this paper from 38GHz to ~60GHz by adding more peaking, like sketched in the figure below ... would a STF like this still be acceptable?

Thanks in advance for any advice!

https://preview.redd.it/h3qrgwa9mlbh1.png?width=2267&format=png&auto=webp&s=dd0f67297f503a6bb56be239c6362f9bd13aa5f0

Ran into the profile below on LinkedIn... does anyone know what sort of IC design is done at Qualcomm Ventures?

https://preview.redd.it/eqlgzpx33ibh1.png?width=494&format=png&auto=webp&s=e6927097e8f576756be33adca9705150c3acfb55

https://preview.redd.it/bbgc5a1s3ibh1.png?width=1035&format=png&auto=webp&s=ed93c6df8e7ca19d500d787e4ebc42fc0a28fbbd

Hi! I am trying to use core MOS devices as a varactors, and read about needing to take non-quasi-static (NQS) effects into account in simulation when using large L values (to maximize cap/area ratio), when operating at tens of GHz.

I tried to search in my PDK documentation and found no mention whatsoever to NQS effects and their modelling. Is this enabled/disabled by default in Taiwanese PDKs? How do you normally deal with this in your simulations (if at all)?

Thanks in advance for any help!

P.S. I know from Google about the "NQSMOD" parameter in BSIM-CMG models, but, as I mentioned, I couldn't find any information in my PDK documentation about how this is handled in my foundry models.

Edit: I'm talking about getting the LLM do the math for papers like this one or this one.

Hi! There are a few papers whose nuts-and-bolts I would like to understand to the finest level of detail with the help of LLMs. Ideally I would like to feed an LLM a journal paper, and have it derive de math behind the equations reported in the paper. With this in mind,

1. Which LLMs would you recommend for trying this?
2. Should I expect significantly better results with paid versions of LLMs (I've never tried one myself!)

Thanks in advance for any help!

P.S. Some context:

1. I'm mostly interested in analog/RF type of papers (for example: on the topic of dynamic distortion of CMOS Tx & Rx circuits).
2. In the past I've asked LLMs specific circuit-related questions, and some of them were able to derive analytical expressions and even generate models/code for deeper insight on the results. Now I'd like to go one step forward and use it to derive all the math in papers.
3. I know the great didactic value of deriving these things yourself, but I'm not a student anymore and I want to apply this to some papers that I'm very interested in, but have no time to do it myself anymore.

Hi! I recently came across an ISSCC ADC paper where they sample the signal in a "truly" differential way (that is, *not* 2 sampling caps referred to a common-mode reference voltage, but just 1 cap between Vin+ and Vin- with 2 sampling switches at both plates).

I never saw this way of sampling discussed in any book/paper, and I suspect there must be a reason... is it practical in real-life, mass production scenarios? Like, does it behave well in the presence of mismatches in devices, timing, parasitics, etc?

Thanks in advance for any ideas!

P.S. I'm speaking in the context of mid resolution, high-speed designs, say: >=10ENOB, >1GS/s.

(Edit: schematic shown is a simplified version of Fig. 18 in this paper.)

Today I ran into the circuit below for biasing cascodes, which I never saw before. What would be the advantage(s) of generating the cascode bias voltages (Vcp, Vcn) in this way? (I mean, compared to classic approaches like the ones in this post)?

Since in the circuit below the generation is achieved through both NMOS and PMOS diodes, is it perhaps better across corners due to some weird NMOS/PMOS cancellation effect?

Thanks in advance for any ideas!

P.S. Or if anyone knows an early reference proposing this type of biasing, that would also be great!

https://preview.redd.it/juep41ac8y1h1.png?width=947&format=png&auto=webp&s=ba571bfc837af6eb39c72d346ba2c8ab0fe189bb

Edit: thanks for the replies, it's been identified.

Found the pic below in an ISSCC presentation (Tx and Rx chips side-by-side); seems some sort of socket for a packaged chip. Does any body know what is called?
Thanks in advance for any help!

https://preview.redd.it/grhuhpczqyzg1.png?width=565&format=png&auto=webp&s=8e0848108c968401b7b68cb4151d60c85e7216aa

Hi! I need to travel to Timisoara and then drive to a town 1hr away to pick up a friend. I want to rent a car for this.
What car rental do you recommend at the Timisoara airport? There seems to be some options on the airport website... are they pretty much the same?
Thanks in advance for any advice!

Edit: Thanks to everyone for your replies! Apparently it's not an issue of Notepad++, but of my laptop (Dell Latitude 5430) not having an equivalent to the "numeric keypad +" key.
I nevertheless was able to suit my needs by redefining the zoom-in / zoom-out shortcuts as per u/J-G-Froejk's advice.
---

As per the title. I tried CTRL + "+", but it does nothing on my laptop.
(CTRL + "mouse wheel" works fine, but I rarely have a mouse connected to my laptop nowadays!)
Thanks for any help!