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February 2010

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Subject:
Re: 40 MHz Oscillator, plated metallization thickness issue
From:
Brian Ellis <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Brian Ellis <[log in to unmask]>
Date:
Fri, 19 Feb 2010 15:04:48 +0200
Content-Type:
text/plain
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text/plain (144 lines) 
As I read it, the plating parts company from the quartz. This is almost 
always a vacuum-deposited silver plating and the adhesion is rarely 100% 
perfect. I have had ultrasonic cleaning cause this problem, even in a 
vacuum tube: the vibration is transmitted by the wires soldered to the 
silver. Nothing to do with resonant frequencies, as the soldering is 
done at a static node.

Brian

Hernefjord Ingemar wrote:
> Victor,
> 
> sorry, I misread, thought you meant 40 GHz. 40 MHz, that's equal to DC for us. At this low frequency plating thickness has  absolutely no impact on any oscillator parameters. With one reservation: if you have extremly long traces, but that use not to be the case. 40 MHz, police radio? 
> I'm not sure what part of the oscillator you discuss. Is it the X-tal itself or other parts of an oscillator? Or do you speak about a PIN oscillator or other semiconductor based VCOs? One use to deposit a wetting layer of e.g. titanium, followed by a micron thick nickel layer and finally gold. In some cases even copper is involved. We've beem designing oscillators for decades, but never heard any issues about plating thickness. 
> Interesting question.
> 
> Inge
> 
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: fredag 19 februari 2010 09:35
> To: [log in to unmask]
> Subject: Re: [TN] 40 MHz Oscillator, plated metallization thickness issue
> 
> Victor,
> 
> Be careful with nickel plating when you travel GHz/ns-signal. The charge transportation will be dependent of the skin effect, and as some nickel plates have a magnitude higher resistivity than copper and gold,  you'll get attenuation losses. Therefore, we have skipped nickel plating and use bare coppar or tinned copper. I recommend Larry Gatewood's paper 'Effects of surface finish on high frequency signal loss....'. Check with some TN guys at Rockwell Collins. Larry used to work at Cedar Rapids.
> 
> Inge 
> 
> -----Original Message-----
> From: [log in to unmask] [mailto:[log in to unmask]]
> Sent: torsdag 18 februari 2010 15:28
> To: [log in to unmask]; Hernefjord Ingemar
> Cc: [log in to unmask]
> Subject: RE: 40 MHz Oscillator, plated metallization thickness issue
> 
> Wayne,
> 
>    The original questions were not answered.   Has anyone else found failures on oscillators related back to the plating metallization thickness.   I too have been involved with the other anomalies mentioned but not plating issues.
> 
> vic,
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Hernefjord Ingemar
> Sent: Wednesday, February 17, 2010 5:26 AM
> To: [log in to unmask]
> Subject: Re: [TN] 40 Mhz Oscillator
> 
> But never seen Granada (Spain)? No ha visto Granada ha visto nada.
> 
> Inge
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Thayer, Wayne - IIW
> Sent: tisdag 16 februari 2010 20:58
> To: [log in to unmask]
> Subject: Re: [TN] 40 Mhz Oscillator
> 
> I've seen all kinds of crystal/oscillator failures.  Usually they have vapor deposited metallization, and often they are laser trimmed.  I've seen too much laser scribing.  I've seen failure of the conductive epoxy gluing on the crystals.  I've seen crystal fracture due to shock--usually when I drop a small board with a crystal oscillator on it, it lands on the crystal package!  Some have windows where you can see the shattered glass.
> 
> Wayne Thayer
> 
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Victor Hernandez
> Sent: Tuesday, February 16, 2010 2:28 PM
> To: [log in to unmask]
> Subject: [TN] 40 Mhz Oscillator
> 
> Fellow TechNetters:
> 
>    Can the electrode plating be too thin resulting in a failure.
>   Can the plating migrate over time, vibration, over to the low spots on the surface of the electrode affecting the ESR?
> 
> Victor,
> 
> 
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