Recent content by analogdesign

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    Capacitor Extraction: Charging & Isolating Electrons

    Surprised no one mentioned this explicitly, but this exact procedure is the basis of Dynamic Random Access Memory (DRAM). The bit you are storing is represented by a presence or absence of charge on an isolated capacitor. The technique also underpins most practical analog to digital conversion...
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    Job Skills What to do as a scientist between jobs

    This is a good article and highlights some of the real challenges in having a relationship between two academics. The jobs are few and far between and become more so the more specialized you are. The author made the right call moving back to the US if the ultimate goal was to continue his...
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    Purely passive RC Phase Shift Oscillator?

    You've mentioned a couple of times you would have a "boost converter" and that would indeed have active components. A truly passive oscillator is only possible using ideal components. Imagine you magically have a working oscillation. In your proposed circuit, the amplitude of the oscillations...
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    Purely passive RC Phase Shift Oscillator?

    If there is gain, then the circuit it is not passive (this is how you confused a lot of folks). Instead of the mythical gain at the +20V node (you don't want a boost converter, btw, those are DC devices and you want an AC gain) why not use a transistor? That's what they are for. In fact, the...
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    Programs Is doing a PhD in Engineering Part Time in 8 Years Possible?

    https://oge.mit.edu/gpp/degrees/masters/engineers-degree/
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    Programs Is doing a PhD in Engineering Part Time in 8 Years Possible?

    Sure it's possible, not one said otherwise. It would be very difficult, with a high chance of failure, and dubious benefits if successful. Citation seriously needed. I work closely with about 15 and know at least 50 engineering PhDs. As far as I am aware, not a single one didn't publish papers...
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    Engineering Many rejections - Not knowing why

    Because they've never worked out. It isn't that I have anything against anyone who applies out of the blue, but most PhDs work in rather niche fields. I'm in the semiconductor area but I work in a niche. So, I know a good portion of the people who do what I do. So, if I don't know your advisor...
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    Programs Is doing a PhD in Engineering Part Time in 8 Years Possible?

    Not really, to be honest. Where I went to school (at least) there weren't really any "PhD courses". You just took more of them. An MS student would take the main course sequence for their focus and then graduate. I took those same courses, plus a bunch of courses in related areas. I also took a...
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    Engineering Many rejections - Not knowing why

    You're in a tough spot. Being years away from your research with no work experience is hard. Typically a PhD finds work through his or her network. I've never hired a PhD who wasn't either referred to me or who I was already aware of their group or advisor (at least). It could happen, but it...
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    Programs Is doing a PhD in Engineering Part Time in 8 Years Possible?

    The coursework is the least important part of the PhD, the research is what adds value. An MS is a solid degree. I don't think taking more courses beyond that will enhance your employability in any meaningful way.
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    Baseline Recovery time of Shaper Amplifier output

    I take it this is for a detector readout application. Baseline recovery and restoration is covered in Knoll (the standard text for this area). Basically you have to define how close to the "final value" you need to get and measure that. What Tom G. said is exactly right, but for you, a simpler...
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    Math Job search ideas for an applied math major?

    I have a friend with a Master's in Math. She now works at Google developing algorithms to detect and counteract people trying to game Google's search metrics. It sounds super interesting and she makes a very good living. This could be right up your alley given your combination of software and...
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    My Chances for these Physics PhD schools

    They do receive a lot of emails, and i agree not to come across as a pest. In my latest hire I had one applicant email me every few days while we were going through the process. This did not help him. If you are going to contact a professor I would recommend a very brief focused email that is...
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    B Conduction Band Filled: Can Semiconductor Act as Insulator?

    You can’t fill the conduction band because if you increase the energy of a charge carrier in the conduction band it leaves space for a new carrier but remains in the conduction band.
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    Circuit design question -- 100% transistor functionality needed?

    If you're asking about ADC sampling rate that would be determined by a frequency synthesizer, not the ADC itself. There are designs with excellent temperature stability but there is always a limit to how fast it can track temperature change. 10C a minute seems fast. If you specify that the PLL...
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