can we use GSM PA and OSC for our transmitter design ?

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orpheus

Joined: 22 Dec 2001
Posts: 25

18 Jul 2002 2:36 can we use GSM PA and OSC for our transmitter design ?

hi all

can we use GSM PA and OSC for our transmitter design ?
have a idea ? because gsm PAs are very cheap and powerful
2W at 900mhz but i dont know how much db is the gain ans osc
control system is it vco ? if yes it is very easy to use gms pa and
osc ?

jwei363

Joined: 10 Jun 2001
Posts: 36

18 Jul 2002 3:14 you question is not so clear

but you can check www.RFMD.com for RF 3108 (GSM/PCS/DCS)
or other GSM PA.many manufactures use VCO directly drive PA
to get a 2W output.

dd21

Joined: 23 Jun 2002
Posts: 21

18 Jul 2002 3:35 Re: can we use GSM PA and OSC for our transmitter design ?

orpheus wrote:

what is your target platform. The linearity of GSM PA is not very good. You can only use those for GSM or AMPS(FM) modulation. For the other popular applications such as CMDA or TDMA phones, you have no way to use.

shanren

Joined: 12 Oct 2001
Posts: 106

18 Jul 2002 6:00

no,it is not easy to use.you can build your own,many company have rf amp modles,and is very easy to use.try:
http://e-www.motorola.com/webapp/sps/library/prod_lib.jsp
to find what you want.

orpheus

Joined: 22 Dec 2001
Posts: 25

18 Jul 2002 15:22 gsm pa and osc

hi

i want to use because this part are very cheap here and
easly available. i know there are perfect rf components from
motorola mitsubishi hitachi rfm etc... but they are not cheap and
i couldn find they easyly. if there is a vco what is the hard part of
use it for a local osc ?
i think to use PA for digital transmitter like a 433 mhz ism band
remote control or toy control transmitter but more powerful

thanks for the answers

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18 Jul 2002 15:22 Ads

dd21

Joined: 23 Jun 2002
Posts: 21

20 Jul 2002 3:36

You can use GSM PA if you want to. FSK does not require any linearity from PA.

Wilson_yu_chen

Joined: 27 Jan 2005
Posts: 125
Helped: 6

17 May 2005 7:16 Re: can we use GSM PA and OSC for our transmitter design ?

PA is a kind of foot/hands in RF system, osc is a kind of heart power, and transceiver plays a role in connecting them which is also very important.

GSM PA : 1.5$

egemini

Joined: 02 Apr 2002
Posts: 160
Helped: 2
Location: GOC

04 Jun 2005 11:40 Re: can we use GSM PA and OSC for our transmitter design ?

You can build only FM or similer transmitters with GSM PA module, for AM or other linear modulation schemes you have to use a linear or linearised amplifier.