On 12/12/2012 12:28 AM, Azelio Boriani wrote:
Magnus, you said it:
The GPS front-end chip I haven't been able to find a datasheet for
the CPU/GPS-baseband chip seems to be an ASIC
Quest for the HolyGrail...
On the other hand, it's not all that many pins, so a bit of advanced
guessing should not be too hard to do.
Tossing a sine in I bet you will find mixed-down versions occuring in
one or two IF-filtered versions before breaking free as digitized
version. Most probably as 2 bits and clock going to the GPS baseband chip.
This is what a typical GPS front-end chip does. You toss it a reference
frequency, and it steps it up, amplifies the GPS signal, mixes it down.
It will be one or two SAW filters with balanced outputs and inputs.
Fairly trivial stuff.
Cheers,
Magnus
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