unit style changes and ECN0017 (BT to main PCB) -> Done

[Werner Almesberger]

BT is good, too. Having me as author and reviewer on ECN0017 may look
a little incestous, but there's an invisible commit by Dave between
the two that makes it alright.

Then I changed a number of inconsistent units:

- capitalization (100N -> 100n, etc.) mainly in wlan.sch, but also a
  few in modem.sch and one one in pmu.sch
- SI prefix replaces decimal point: bt.sch

- Werner

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[Rene Harder]

Btw, I had an idea the other day.
Why we don't we remove the output filter (C2, C1 and L1) completely and
use the same filter as for WLAN (BF2520) which has probably a better
filter characteristics anyway. So we don't have to worry about impedance
match or EMI compliance.

What do you think?


Rene

Werner Almesberger wrote:

> BT is good, too. Having me as author and reviewer on ECN0017 may look
> a little incestous, but there's an invisible commit by Dave between
> the two that makes it alright.
>
> Then I changed a number of inconsistent units:
>
> - capitalization (100N -> 100n, etc.) mainly in wlan.sch, but also a
>   few in modem.sch and one one in pmu.sch
> - SI prefix replaces decimal point: bt.sch
>
> - Werner
>
>  

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[Werner Almesberger]

Rene Harder wrote:
> Why we don't we remove the output filter (C2, C1 and L1) completely and
> use the same filter as for WLAN (BF2520) which has probably a better
> filter characteristics anyway. So we don't have to worry about impedance
> match or EMI compliance.
>
> What do you think?

I like the idea, but ... where do we get the BF2520 from ? I checked
the usual suspects (Digi-Key, Mouser, Farnell, Arrow), and none of
them seems to have it.

Or would you know a suitable replacement part that's easier to source ?

- Werner

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[Rene Harder]

Werner Almesberger wrote:

> Rene Harder wrote:
>  
>> Why we don't we remove the output filter (C2, C1 and L1) completely and
>> use the same filter as for WLAN (BF2520) which has probably a better
>> filter characteristics anyway. So we don't have to worry about impedance
>> match or EMI compliance.
>>
>> What do you think?
>>    
>
> I like the idea, but ... where do we get the BF2520 from ? I checked
> the usual suspects (Digi-Key, Mouser, Farnell, Arrow), and none of
> them seems to have it.
>
> Or would you know a suitable replacement part that's easier to source ?
>  

We could use this one
http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=712-1092-1-ND
.
It has exactly the same specs, dimensions and  pcb pattern as the BF2520.

Rene

> - Werner
>  


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[Werner Almesberger]

Rene Harder wrote:
> We could use this one
> http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=712-1092-1-ND
> .
> It has exactly the same specs, dimensions and  pcb pattern as the BF2520.

No stock and 2 months lead time :-( But there is hope: the
2450BP39C100C is available. The main difference seems to be
        ^
the insertion loss, which is 1.5 dB instead of 1.2 dB.

There are actually WLAN & BT filters from several companies with
more or less the same characteristics and footprint, so this is a
safe choice.

- Werner

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