Tektronix Common Design Parts Volumes 1 to 4 - Page 1
Forum section: electronics / testgear

author: perdrix
author_rank: Frequent Contributor
timestamp: August 23, 2018, 10:04:55 am
content: I've just uploaded these to ko4bb.com:http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=07_Recent_UploadsThanks to Pete Lancashire for the scansDave Partridge

author: LapTop006
author_rank: Unknown
timestamp: August 24, 2018, 02:08:06 am
content: They don't show download links for me?

author: iainwhite
author_rank: Unknown
timestamp: August 24, 2018, 02:19:15 am
content: Quote from: LapTop006 on August 24, 2018, 02:08:06 amThere is a comment in the header:"These files cannot be downloaded yet.They will be moved to their respective directories after being checked out."I guess they are awaiting some sort of admin review/approval

author: perdrix
author_rank: Frequent Contributor
timestamp: August 24, 2018, 08:58:39 am
content: Didier has now moved them to:http://www.ko4bb.com/getsimple/index.php?id=manuals&dir=TektronixI've since uploaded two more ...CheersDave

author: PartialDischarge
author_rank: Super Contributor
timestamp: October 22, 2018, 05:52:27 am
content: I wish Tektronix finally released the handbook on design and construction onbridged T coilsthat they must have somewhere

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 22, 2018, 02:15:09 pm
content: Quote from: MasterTech on October 22, 2018, 05:52:27 amI found a better one somewhere, it covers series, shunt and tapped coil peaking with M-derived prototypes. If I remember when I get home, I'll find a link for it...Tim

author: duak
author_rank: Super Contributor
timestamp: October 22, 2018, 07:38:51 pm
content: Tim, I recall that Tek had some sort of legal protection for T network IP. I can't imagine they patented it because that would have brought the IP into the public domain. Mind you, I didn't try a patent search. Do you know more about this?Cheers,

author: PartialDischarge
author_rank: Super Contributor
timestamp: October 23, 2018, 02:39:08 am
content: The only patent I know of regarding this is US3155927. Patents back there were so to the point and lacking all the bs of modern ones.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 24, 2018, 01:51:43 am
content: Oh yeah, I remembered!Wideband Amplifiers, Starič and Margan, Springer (2006).http://www-f9.ijs.si/~margan/WBA3_4web/Wideband_Amplifiers_FPRL.pdfThis link, actually, is probably pretty reliable... that's the author's website, not a copyright violation!They acknowledge former Tek employees, so this is probably as thorough as anything else.Tim

author: capt bullshot
author_rank: Super Contributor
timestamp: October 24, 2018, 06:46:09 am
content: Quote from: T3sl4co1l on October 24, 2018, 01:51:43 amThanks, really interesting. Now the T-coil is demystified, at least for me. In very terse form: They just turn a single order lowpass filter formed by circuit parasitics into a higher order filter, which has a steeper roll-off and in turn a higher -3dB frequency. Beautiful and simple, though some complex math required for full analysis.

author: T3sl4co1l
author_rank: Super Contributor
timestamp: October 24, 2018, 02:08:48 pm
content: Yup!It follows that, any system you can increase the order of, while maintaining control of the poles, can be improved in identical fashion. Take the voltage mode SMPS for example: it has a two pole output filter, plus one more for the controller (assuming a traditional dominant-pole or pole-zero controller). Downside, the filter pole depends on the attached load, so you can only adjust it to, say, a 3rd order Bessel or Butterworth or whatever, for a given load.I forget if you can do that with higher order compensators (i.e., more than one integral term), or if the poles stack rather than split, so you have no control over them (integrators at least must, because you only have one degree of freedom per integrator -- its gain -- and the product of any number of integrators still only has one gain term).It might be doable with a chain of error amps (i.e., one loop is the "plant" of the next loop, and so on), where pole splitting does occur; but it need not be straightforward what the trajectory of all those poles is, and if you can coax them onto a circle or ellipse for anything, as needed for a known filter type. Or if the result is any less sensitive to source/load conditions. (In other words: you can try playing with your piezo stack and compensating it in this way, but you're much more likely to be fruitful, using a more conventional method like cancelling the dominant resonance in the loop.)Tim