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Looking for info about GSM switching/debugging

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xdlou

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gsm ramp profile

please help!
who has source about cell phone GSM switching or debug experience?
what are related to switching?
thank you!!
 

orfs due to switching

There was book uploaded "GSM architecture" (not sure about name ) it can help you .
 

you must use cell phone with modem.When turn on modem function,you can data transmission.
 

relate to swtich spectrum or other?
 

Re: GSM switching

If you mean the ORFS due to switching fail.
check your burst ramp up and ramp down curve.
The curve should be smooth, if not, ORFS due to switching may fail.
Try to calibrate your ramps.
 

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artem said:
There was book uploaded "GSM architecture" (not sure about name ) it can help you .
Click to expand...

can you tell me where to find the book?
thanks!!
 

xinxin said:
relate to swtich spectrum or other?
Click to expand...

yeah! has some resource?
 

Re: GSM switching

rhjang said:
If you mean the ORFS due to switching fail.
check your burst ramp up and ramp down curve.
The curve should be smooth, if not, ORFS due to switching may fail.
Try to calibrate your ramps.
Click to expand...

had checked ramp!
but no good effcet
 

Re: GSM switching

check the shape of power versus time,especially the rise and fall part.
 

Re: GSM switching

the due to switch is PA on/off side efficent
so check you ramp profile
and PA power de-coupe capacitance
maybe too small
 

Re: GSM switching

are you sure no problem for your pcb design?
 

Re: GSM switching

northguy said:
are you sure no problem for your pcb design?
Click to expand...

yes,when the temperature of the pcb board is higher than ambient ,the performance improved.
so can eliminate pcb factor.
 

Re: GSM switching

K'unI said:
the due to switch is PA on/off side efficent
so check you ramp profile
and PA power de-coupe capacitance
maybe too small
Click to expand...

changed ramp table has no effecient.

and which is the de-couple capacitor?

we had adjusted the pll loop filter ,Poutlevel,the maching network of tranciever out ,there are some efficient,but no distinct improved.
 

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