[time-nuts] [TekScopes] Fast Rise/Fall Time Pulser

Larry McDavid lmcdavid at lmceng.com
Tue Oct 10 20:11:03 EDT 2017


Mine arrived today. Alas, it uses a USB B connector instead of a more 
common USB mini or micro; I gotta get a cable.

Mine has the comparator IC marked only, "AJK  BAA." Yes, this is an 
Analog Devices ADCMP572 or ADCMP573 Ultrafast SiGe comparator. I'm not 
sure which output configuration is used yet, but likely is the 572 with 
CML output drivers.

The controller IC is a 18F25K50 PIC with integral USB. Level programming 
software is available on the Leo Bodnar website for download.

The board was supplied with a test result data sheet from a Tektronix 
CSA803A (website picture shows a SD30 40 GHz sampling head used) showing 
the pulser rise time as 38.91 ps and the fall time as 33.20 ps with 
about 950 mv P-P.

It's a lovely looking board; lots of thought went into the layout. I 
can't tell if it is multi-layer. Now for that B cable...

Larry


On 10/10/2017 12:19 PM, Larry McDavid lmcdavid at lmceng.com [TekScopes] wrote:
> There has been discussion recently about generating fast rise/fall time
> pulses by various means. Here is a link to a Leo Bodnar device that will
> provide <40 ps rise/fall time, 50% duty cycle, 10 MHz pulses:
> 
> http://www.leobodnar.com/shop/index.php?main_page=product_info&cPath=124&products_id=295
> 
> This is built on a small PWB with integral BNC connector, powered by 5
> vdc through a USB B connector; a trigger output is provided. Price is US$68.
> 
> I've ordered one of these for testing.
> 
> Is anyone here using one of these?
> 
> -- 
> Best wishes,
> 
> Larry McDavid W6FUB
> Anaheim, California (SE of Los Angeles, near Disneyland)
> 
> __._,_.___
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-- 
Best wishes,

Larry McDavid W6FUB
Anaheim, California  (SE of Los Angeles, near Disneyland)


-- 
Best wishes,

Larry McDavid W6FUB
Anaheim, California  (SE of Los Angeles, near Disneyland)



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