4 ms·
How does one speed-test a device that switches significantly faster than the available electronics?
by danparsonson 12y ago
How does one speed-test a device that switches significantly faster than the available electronics?
- DigitalJack 12y agodrive a periodic waveform and sample repeatedly. Assuming you don't somehow sample the same point in the periodic waveform each time, you'll eventually get the complete waveform.
- jpmattia 12y ago> Assuming you don't somehow sample the same point in the periodic waveform each time, you'll eventually get the complete waveform. To add an example of a real technique: You can use a short laser pulse and change the time-of-flight (mirrored path on a stepper motor, for instance). This technique will get you to the terahertz region, which is pretty much state of the art for where electronic devices still have gain. http://en.wikipedia.org/wiki/Terahertz_time-domain_spectroscopy#Electro-optical_sampling http://en.wikipedia.org/wiki/Terahertz_time-domain_spectrosc...
- typon 12y agoIt is not even the fastest. This article did well to leave out actually fast transistors, only comparing to graphene transistors which most people don't really consider fast in the first place. Checkout Indium Phosphide HEMTs (High electron mobility transistors): http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4419013 http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=4419013 Mark Rodwell's group in UCSB (http://www.ece.ucsb.edu/Faculty/rodwell/rodwell_info/rodwell.html http://www.ece.ucsb.edu/Faculty/rodwell/rodwell_info/rodwell...) has been working on these transistors for a while. I think they're pushing 2 THz currently.