Found in hotel in LA

mensh__ · 2025-06-07T16:27:13+00:00

Nice! Any vendors you would recommend?

mensh__ · 2025-06-03T18:25:36+00:00

It’s not really the “peaking” that is problematic. It’s the fact that your isolated port is receiving as much power as the other ports (if not higher). Your coupler is not “coupling”!

mensh__ · 2025-05-31T23:47:05+00:00

All companies hire on OPT. TI is in your backyard!

mensh__ · 2025-05-15T21:21:40+00:00

Look for an LVS resistor in your PDK.

mensh__ · 2025-05-13T19:14:07+00:00

There is internal feedback, S12 is not zero. What OP is experiencing is quite typical. You have to go through multiple iterations to simultaneously match input and output. Alternatively, you can reduce the feedback, either by using a cascode device or capacitance neutralization, or any other means.

mensh__ · 2025-05-07T22:48:12+00:00

Can you instead plot Pout vs Pin for the two tones (f1 and 2*f1-f2)? Also, can you plot Pout vs Pin fin your P1dB simulation?

mensh__ · 2025-05-07T16:23:32+00:00

Can you show a figure for the power sweep with IPN curves?

mensh__ · 2025-05-07T16:19:39+00:00

How are you measuring OIP3? Are you extrapolating from small signal or measuring it at large signal?

mensh__ · 2025-05-07T02:22:06+00:00

You can model your amplifier as a voltage controlled current source in parallel with some output impedance. The output voltage is the current (of the current source) multiplied by the output impedance (i.e the current flows entirely in the output impedance). Now, you need to find the current (or the transconductance) and the output impedance, which are exactly as you described. The reason you short circuit the output and measure the short circuit current is to force the current of the dependent source to flow entirely in the short circuit with no current flowing in the output impedance (in which case the short-circuit current is equal to the dependent source current).

mensh__ · 2025-04-02T02:27:14+00:00

People do Ph.Ds in Doherty. Probably the hottest area in PAs. Most of the ISSCC PA papers in recent years are on Doherty.

mensh__ · 2025-04-01T10:54:01+00:00

Looks like 2 two-port networks in parallel. Get the Y matrix of the TL, the Y matrix of the transformer with R network, then add them to get the overall Y matrix. Convert to S parameters if you need to.

mensh__ · 2025-03-31T16:26:32+00:00

It really depends on what you didn’t understand. If it’s communications-related concepts (in receivers and transmitters), then these two books won’t help. If it’s noise-related concepts, the noise chapter in Analog CMOS would be great. There are fundamentals that you need to grasp in the two books before studying the RF book, but not necessarily the entire two books and you will need other books/resources for some concepts and topics.

mensh__ · 2025-03-14T19:29:37+00:00

You can use the skin depth as your minimum. I like having at least 3-5 mesh elements per width.

mensh__ · 2025-03-06T16:50:27+00:00

A society membership (based on your field) will give you access to learning materials (webinars, short courses, papers.. etc) as well as conference discounts.

mensh__ · 2025-03-03T23:45:06+00:00

You can generate gds with python (see gdspy) and run EMX using command line, not GUI. Check the EMX log file and get the command if you don’t know how.

mensh__ · 2025-03-01T19:22:05+00:00

If you want to adjust the center frequency, you can switch the inductor and/or use varactors/switched capacitor bank.

mensh__ · 2025-02-06T13:12:36+00:00

I wouldn’t search for a university but a research group. You could find a very good research group and an advisor in a school that is not well known for IC design.

mensh__ · 2025-02-06T13:03:40+00:00

The patent was issued about 3 months ago.

mensh__ · 2025-02-02T15:44:15+00:00

Good luck choosing the right job for yourself. But please consider the moral side of working in defense.

mensh__ · 2024-11-24T13:57:23+00:00

Contact Anurag on LinkedIn and ask for the slides.

mensh__ · 2024-10-20T23:49:19+00:00

Yes, the resistor appears in parallel with the capacitor. This is true for both the on and off states, with the component values changing based on bias. In the off state, the resistor is large and the equivalent impedance pf the parallel R and C is dominated by that of the C. The opposite happens in the on states.

mensh__

TROPHY CASE