Draper Fellow

Short version: I’m going to be a Draper Fellow. Doing ridiculous things with high-efficiency RF power amplifiers and trying to cram them into as small a package as possible. And maybe figure out why they’re sometimes unstable. Yaay.

More details: My trip into Draper Laboratory was awesome. For those of you unfamiliar with the lab, it’s essentially a Department of Defense laboratory (with some commercial contracts) that was spun off from MIT during the Vietnam War. Just a few notes about my visit:

  1. Security at Draper is tight. Really tight. My camera phone was confiscated at the desk and if I had brought my laptop with me, it would have been confiscated as well. And if I weren’t a U.S. citizen, apparently it would have been significantly more difficult to get in, never mind actually working there.
  2. I thought I was going in just to learn more about the RF power amplifier project that I was contacted about. Turns out it was a full-blown interview for a Draper Fellow position. Whoops.
  3. The current design of the “Class E” amplifier that I’m going to be looking at apparently incorporates a bunch of transmission line structure tricks that have to do with shunting harmonics away from the amplifier input and output. Highly awesome.
  4. Doug (my new Draper adviser) and his boss both went to MIT as undergraduates. They both took 6.301, 6.302, 6.331, and 6.334, which made for a bunch of interesting conversations. Especially when I mentioned that Kassakian was now back teaching 6.334. Good times.
  5. Doug’s also the guy that designed the 3562A dynamic analyzer at HP, which I used extensively during my 6.302 final lab. Another great conversation.
  6. Doug’s boss is willing to pay for me to get a security clearance. Absolutely sweet.

Anyways, being a Draper Fellow has some other nice perks, including full funding, a fairly generous stipend (or so I’m told), and an incredible technical staff (no need to call Advanced Circuits to get a board fabricated). On the flip side, I need to work there this summer, which rules out a possible internship at ADI.

It’s nice to be able to finally figure out what I’m doing next year. And I now also have an exit plan for getting out of here. I can see the light at the end of the tunnel…

Or maybe not.

4 Responses to “Draper Fellow”

  1. JW Holloway Says:

    Congrats on the grad school deal.

    -JW

  2. gva Says:

    Thanks dude.

  3. rsw Says:

    Hot! my thesis was on class E stuff too. Those crazy Sokal brothers…

    LMK if you want pointers towards books. Also, Dave Perreault knows everything there is to know about class E, and then some, as does Juan Rivas (the Ph. D. student I worked with).

    A nit to pick: usually if you’re using transmission lines in the way you’ve described it’s class F; generally class E just has one resonance.

    Oh, yeah, if you’re actually doing class F, get Guilleman’s book, Synthesis of Passive Networks (or something along those lines… I’ll look it up when I get to my office tomorrow).

    Also, when are you available to move to Austin?

    -rsw

  4. gva Says:

    The reason why they had to use the transmission line structures in the Class E is because the GaAs FETs they’re using have non-linear parasitic capacitances, which apparently means second harmonics get all over the place. Although Doug did mention they were using a Class F at lower frequencies…

    Austin? Probably summer of 2007. No clue. I’m definitely not going for my Ph.D., so it’s whenever I get done with my M.Eng. Although I’m not sure where exactly in the country I want to be yet…

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