[time-nuts] Low cost 6+ GHz Prescaler

Sat Mar 27 12:21:57 UTC 2010

What sort of inductance?  For a 68nH part in 0603 size I struggled to find one with an SRF of 2700MHz, let alone above
8GHz.

Regards,
David Partridge

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On Behalf Of Samuel DEMEULEMEESTER
Sent: 27 March 2010 11:57
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Low cost 6+ GHz Prescaler

Some updates.

I finally decided to add some features in order to use the board as a "generic" prescaler. First, I will include a
standard SMA footprint in the output stage and a way to power the board externally. Then I will change the original PIC
UP for a better one, with more memory, and add a 4-way selectable ratio feature by onboard solder jumper. The board will
be able to act as a /100, /128, /512, /1000 generic prescaler. I wonder about the needs for /256 and /500 options. If
someone have some interest for those ratios, let me know. Finally, the PCB size will be approx. 100 x 50 mm. I know it
could be smaller, but I have to do with the counter's mounting holes.

PS : I'm looking for a source for RF chokes (MMIC Power stage) useable from DC to 8+ GHz. 

-----Message d'origine-----
De : time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] De la part de Grant Hodgson Envoyé : vendredi 26
mars 2010 20:10 À : time-nuts at febo.com Objet : Re: [time-nuts] Low cost 6+ GHz Prescaler

I've used the RFMD NBB300/310 and they are excellent up to 14GHz.

The NLB300 and NLB310 are in plastic packages and are somewhat cheaper than the NBBs, but have similar gain
characteristics.  They don't do strange things when compressed; I've driven them right up to the abs. 
max i/p power level and they survive, and I don't see any evidence of harmonic problems when driving a Hittite HMC364 /2
prescaler.

They do exactly what it says on the datasheet.

regards

Grant Hodgson

> 
> RFMD seems to produce some nice MMIC, for example the NBB-300 
> (http://www.rfmd.com/CS/Documents/Nbb-300.pdf), but I never used a 
> RFMD amplifier. I used Agilent/Avago MMIC since years with great 
> results, but always with frequencies no more than 3 GHz.
> 
> Anyone have some experience with DC-8/12 GHz MMIC and which's the best ?
> 
>

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