[time-nuts] Re: *** SPAM *** Re: [OT] MB506 pre-scaler module ??

[ghf at hoffmann-hochfrequenz.de]

Am 2023-05-13 3:00, schrieb ed breya via time-nuts:

> "The  HMC493LP3  &  HMC493LP3E  are  low  noise
> Divide-by-4 Static Dividers utilizing InGaP GaAs HBT

I have built a 1/8 prescaler using the HMC363 to extend the trigger
bandwidth of my 54750A scope from 2.5 to 12 GHz (or the SR620).

It was necessary to have a gain block in front of the prescaler
since the HMC363 pumped some of the divided signal back into its input
which contaminated the measured channel with some jitter.
A second gain block at the output makes sure that there is enough
signal left even after a power divider.

The home-etched board is still without the preamplifier.
Oscillation tendency is most easily cured by a small DC offset.
That costs some sensitivity, another reason for the preamp.

The design has been published in DUBUS last year. I'll put it
on my web site when the FTP access works again. Gerbers are available.

Cheers,  Gerhard   DK4XP
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