HP 5180A Digitizing Waveform Recorder Sample and Hold Circuit board
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- čas přidán 7. 06. 2024
- This circuit board was sent to me from the seller isaactheodore on eBay. I had purchased some circuit boards from him previously, and showed him that I enjoyed taking electronics apart and photographing the silicon chips inside. He showed me this interesting board that he had and asked if I wanted to open it. Of course I said yes!
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This is the Sample and Hold circuit board from an HP 5180A, which is a Digitizing Waveform Recorder. Their function is to capture analog waveforms on their inputs and convert them into digital waveforms that can be stored in memory. These waveforms could then be displayed on an external monitor. The HP5180A was capable of sampling at a rate of 20MHz, or 1 sample every 50ns.
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Here is an excerpt from the Hewlett Packard Journal November 1982 edition describing how the Sample and hold circuit worked. You can also click the link to the PDF below and read the entire document.
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“The S/H is directed to acquire a point on the S/H input waveform by a positive pulse on the sample line. This pulse forces the sampling switch to close, causing the hold capacitor to charge to the voltage at the input to the switch and then follow or track it. This voltage is a buffered attenuated version of the S/H input. When the pulse returns low, the switch opens and the voltage on the capacitor is held because of the high impedance at this node. The post-amplifier buffers the hold capacitor voltage from the digitizer and amplifies it by a factor of two to compensate for the resistive attenuator at the preamplifier output. The function of the attenuator will be explained later.” - Hewlett Packard Journal, November 1982 Volume
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The above document also mentions that four custom ICs were designed specifically for this circuit. Three of them can be viewed in this video, along with all of the other support chips that are on the hybrid ceramic circuit board.
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There are more things that I’d like to look at in the HP 5180A. If anyone happens to have one that they are looking to part with, even if it's broken, I’d definitely be interested in taking it off your hands. 😁
Video Chapters:
0:00 - Unboxing & Inspection
3:09 - Opening the device
4:20 - First Look
5:22 - Chips under the microscope
References used in video:
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Link to Hewlett Packard Journal PDF:
hparchive.com/Journals/HPJ-198...
All Journals:
hparchive.com/hp_journals
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HP Memory Project link (photo)
www.hpmemoryproject.org/wc_pa...
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All music used in this video is AI generated and licensed through a Soundful Premium Subscription. - Věda a technologie
Absolutely fascinating! We used this HP Unit at Hughes Aircraft Support Systems group in Long Beach in 1986.
I think you might have just made Curious Marc cry.
I'm sure he's fine 😁
Being an 80's kid, I am especially fascinated at some of this older tech. Great fun to watch.
I love this channel and plan on making this my new hobby. Thanks for the wealth of knowledge you share.
this must have been super high tech back in 1983.. I can somehow not imagine they had laser trimming back then
Brilliant video again and a very cool ceramic package/hybrid. I have some gold square metal cans from hp out of some old test equipment I need to pop open and photograph.
as a part time e-waste scrapper this is the reason to become a hoarder! like who on earth wants to scrap all those amazing pieces of technology! i put so many things aside that i have no space left, and when i start scrapping some of the tech i put aside, i feel bad afterwards 😂 ps: i was thinking about creating a channel where i dive into the tech, just ordered a microscope. 1 day later i discover this channel, its like you beat me to it. so i have to go on another route!🤔
way to less channels like yours. nornally i dont sub to channels while watching the first short... keep up man!
Hey Just do it, But just do it with your own "spin" ya know. Explain how ya got it, Then delve into it etc. Just all with ur own personal thing. 👍 with how many viewers there are on CZcams, there are pleeeeenty to go around
Great work. Thanks.
Great video! And a nice golden doodle!
I know it’s probably not as interesting, but can we open up something that’s actually new and see how little precious metals or gold is inside of them anymore. For example, gold bonding wires do any of these new ICs have any gold bonding wires or no?
Yes most IC's still have bonding wires to the lead frame. For higher speed parts we get the bare chips with solder bumps that we put directly on the PCB, thereby eliminating the bonding wire inductance.
What model is your microscope, great video.
The first hidden secret will be a mouse. Cats are usually drawn with triangular ears and mice get drawn with round ones
7:17 some kind of current source? There are 4 different sized pads that looks like they tested 2 other parts before selection the 3rd.
Wait, that middle circuit, did I see a FULL BRIDGE RECTIFIER on this diamgram? ElectroBoom would love this stuff
4 diodes used as a switch - drive the upper and power connection points and the input and output are L and R respectively (or vice versa).
7:17 I think this is a capacitor, and perhaps used to tune some high speed ish stuff (and perhaps in combination with the relatively long bondwire to it makes a specific series LC circuit, could it be to suppress a certain frequency? Or smoothen some nasty square wave flanks?)
Nope - the transformer/ferrite ring is used to develop a signal to differentially gate the diodes ... this is the heart of the sample and hold.
Wow. It looks expensive. I have never seen so many miniature circuits in one device before. I think it's a cat. No a mouse. Lol.
yahoo! Thanks!
Not sure what 100k test equipment You're looking at but 100k buys you a LOT nowdays, which makes sense considering the progression of technology.
But for something to be 100k its gotta be either super niche or super comprehensive in its field.
We used 100k test gear as the Spectrum analyzers in cellular tower radio repair. Doing QAM analysis, doing frequency, bandwidth, power measurements, all of it. It really was a great little workhorse.
The 5G stuff we had was even crazier. Probably about 250k, fully automated test gear for the Verizon 5G home boxes, those white ones you've seen ads for.
For the cutting edge stuff of the modern era, 100k range isn't too far off. The real crazy thing is that a 20 meg sample storage oscilloscope was cutting edge in 1982, worthy of 100k and a feature in the HP Journal, and now, it's a 60 gig samples per second beast, that runs windows, and can do digital Fourier analysis, convolutions, etc, all programmed in software to the user's use case.
re: :Not sure what 100k test equipment You're looking at but 100k buys you a LOT nowdays"
Then was then and now is now; we have come a long ways, and we built it with gear like this as we moved forward ... que?
This was state of the art in 1980 - hence the state of the art cost. Today you can buy something similar for less than $1000 (20 MSPS Oscilloscope, like a Picoscope). But a state of the art oscilloscope today costs upwards of $500,000.
i only see gold to recover. Nothing else
❤️❤️ I love this stuff! Moar legacy analog plz 😁