i want implantable RF transceiver??

i want implantable RF transceiver. Min freq is 400MHz . its should be low power.Modulation type for Rx-ASK and Tx-FSK is preferable .....
Can anyone suggest some vendors? I need it ASAP.
Thanks in advance
~niks~

Lots of companies have very simple (& Cheap) chips to implement this ASK demodulation can be implemented off of the RSSI pin (Received Signal Strength Indicator) as long as the frequency of the data coming back is not too high, Most chips will allow you do do FSK by 'Crystal Pulling'

I guess your looking at 433MHz, most large companies offer solutions in this range, I'd sugest looking at www.micrel.com / www.melexis.com or www.rfmd.com.

Atmel even have some solutions, though a lot nastier to implement. One thing you need to consider is what you mean by a tranceiver, Nearly every tranceiver has a T/R switch before the antenna contacts that will stop you from working in a full duplex situation.

I also seem to remeber TI putting out a good set of chips a while back that have FM/AM transmit reseive capabilities, Try www.ti.com the TRF 5901 is the 900MHz varient but I'm sure they had some 400MHz stuff..

Sorry, just re-read your original message and saw the implantable bit, now I'm thinking you may be looking for a completely different technology such as a RFID transponder??

If you could post any more detail about what you are intending to do it may help.

Also I've included a datasheet on tranceiver archeitectures from a company called MicroLinear, there products start at 900MHz band which may be too high for you, but it is some usefull general background...

Hi
Thanx for the help. Im very particular about the
1. Freq - 400KHz min(402-405KHz preferred)
2. Vcc <= 3 V
3. Low Tx/Rx ct consumption
4. Output power programmable/uC interface then it well n good.
5. min 20kbps
~niks~

Hi Niks,

My apologies for not replying sooner, work is a little crazy at the moment.

I am unsure as to what you are asking for now, original post said 400MHz, there are IC's around that will let you do 20kbps and above due to 433MHz being a popular ISM band, and 3.3V supply but would run off less for decreased range

The last post said 400KHz, this wouldn't be found in a IC solution but wouldn't be too difficult to design from passive components, it would essentially be simular to a leaky transformer, but would need you to check the legal requirements for radiation in this band.

Regards.

Hi GlamZ,
Thanks for your reply. Actually im not totally aware of medical standards and other stuff required to follow for implantable RF design. Do u have any idea about it ? mine operating freq is 402/405MHz , so what i asked in range >= 400MHz.
for me current consumption is very critical . just now i got one IC CC1000.
Im something better than that.
Regards
~niks~

OK.

I've done something similar to this in a previous life, couple of general points about it.

You will lose a lot of your transmit power through the skin & muscle, If you do a web search on S.A.R (Specific Absorbtion Rate, not the virus!) you should be able to get an idea of your transmit/receive distances - a lot of work on this has been done due to mobile phones.

2nd, There are no specific european requirements for implantable radio tranceivers, at least there wasn't -there might be now, there is however a lot of standards about implantable electronics and general electronics in medical usage - These are very strict

3rd, Be warned about how you implant this, infections, etc, in an project I did before we had lots of problems with metal electrodes, corosion and solder problems

4th, if you use 433-4MHz you don't need to worry about radio approvals, as long as your within the specified limits (Sidebands Tx power, etc), if you stray from this you will need to get a radio transmission license, go through approvals, etc

Current consumption will depend on your specific application, for example if your only transmitting rarely, using a high Tx current consumption can work very favourably if you use a scheme such as Pulse Position Coding you can really extend the battery life.

I've included a PDF of a chip that may be of use, it has a very *neat* sniff mode that again depending on how you use it will save power consumption.

To be honest I think you will struggle to find a chip with a much lower power consumption than the CC1000, Transmit and Receive currents are 4-5mA as I remember. it may be a lot easier to look at how you use it slowing data rates if possible, etc

the website is : www.amis.com

Hi GlamZ,
Thanks for information. SAR information is new to me . thanks a lot. yes its diff to find out device better than CC1000. you worked on implantable medical device? then u can gimme some tips regarding that. Or abt low power designs. u designed RF ckt for that.
If u find any good device pleas inform me. I mailed long back to amis for detailed data sheet but didnt receive any reply yet
anyway thanks
regards
~niks~

Can anyone suggest some other RF transceivers like Melix,Chipcon or Xemics. ??? I need them very urgently.
thanks
~niks~