Circuit Cellar Contest - RF Transponder

linnix · 2006-10-11T16:09:32+00:00

I am drafting designer into the Circuit Cellar design contest, ($10,000splits three ways). We will be fitting an RF transponder into a cellphone (with the orginal board removed). So, we need experts in thefollowing area.ISM band FSK RF transceiver TDA5100/5210 TRF6903FPGA/CPLD LCD controller (100x100) Xilinx Spartian/Cool RunnerARM LM3SXXX (required)I recomend the following list of people to head one of the projects.If you are in this list, please indicate if you are willing to committo it. For Ulf, yes, you need to do ARM, even if you work for Atmel.Your challenge is to make it portable to AVR. For everyone else,please vote for one in each team or write in other candidates. Thanks.larweTim WescotPaul CarpenterJoergUlf Samuelsson

Oct 11, 2006 21 Replies

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linnix 19 years ago

Yes, you are right. It's a filter, not a crystal.

Perhaps for noise margins with lower VCC (2.2V to 3.6V for TRF vs. 5V for the TDA). Anyway, I am not going to worry about the physical size, except with the note: "smaller board can be made". The lower VCC is swinging me back into the TRF camp for now.

By the way, what would be good choices for RF Amps? It will be feeding directional antenna if output exceeds FCC limits.

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Joerg 19 years ago

Hello Linnix,

Again, check NordicSemi as well:

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Don't know, I used to do them discrete. Picked a nice transistor and had at it. But this is not cool if you need pre-cert stuff.

Regards, Joerg http://www.analogconsultants.com

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