Output power issue in CC2500 RF Transceiver

Sadagopal,

To be able to comment on this we would need to see a picture of your PCB layout and a detailed BOM of the RF section. The issue is that the layout of your particular PCB could significantly influence the results.

Regards,

/TA

7002.RF_CC2500_Schematic.pdf4718.RF_CC2500_BOM.xls4135.RF_CC2500_Layout.pdf.

Hi,

  I have attached the schematics, Layout and BOM for CC2500 RF Transceiver. Kindly have a look on them and suggest us to improve RF output power of CC2500.

Thanks & Regards,

sadagopal

 

 

Sadagopal

There are some layout differences between yours and our rerference design, however I do not think that it would change the performance by more that 1-2dB.

/TA

 

Sadagopal,

You cannot probe at these points and read voltages directly.   You can take s-parameter measurements but it makes no sense what you are doing.  Your measurement circuit will add phase shifts in a circuit which is trying to sum two signal that our out of phase at a common summing point.  Even trying to measure at the summing point will not provide an accurate reading,  since you are not matching to the impedance therefore a reflection will occur.  The safest place to measure is out the connection between the traces and antenna assuming both are 50 ohms.     Thix is done usually by connecting an open ended piece of coax to this point and measuring with power meter or with spectrum analyzer. 

RRS

Low Power Wireless Group.

Sadagopal,

As Suggested by TA, looking at your PCB layout and TI's Ref design, a power difference of 1-2db is what is the best loss expected. Since you are looking for more power and range, I would recommend you to check out Anaren's A2500R24A modules  (http://www.anaren.com/content/File/100827b_20_20A2500R24A_EM1_20Prod_20Brief_20STD_20RES.pdf). These modules combine Ti's CC2500 and its matching network and are also FCC and ETSI compliance. Hence you will not have to worry for any "intentional radiation" with Anaren AIR modules.

Moreover, Every AIr module is Completely RF tested to provide the correct RF power output at the corresponding configuration values in the PA Table. 

For more details on AIr modules, Please check : http://www.anaren.com/content/File/AIR/AIRoverview.cfm

-The AIR team @ Anaren

Anaren is a third party Developer Network Member for Low Power RF and MCUs.

Hi Yikai Sir,

Greetings for the day !!!

Sir we have developed our custom Zigbee Hardware, And I have tested it with GE Dimmer Bulb, Case of testing was

My Cutom Zigbee (Hardware Board that we have designed) as Co-Ordinator and GE Dimmer as End Device.

For Some distance it is working fine but after some distance as I can See, My GE Dimmer Bulb is Continue to Operate from My Custom Zigbee working as Coordinator but I am not getting the Acknowledge command from GE . But GE is Continue to operate Dim Up and Down along with On-Off.

I thought it is because Command sent Data rate is 40kbps and Ack is 9.6 kbps.

So in order to follow that I have tested my Code (Coordinator ) on development Board of Zigbee and I am getting the response now.

So, My question is , Is it a hardware issue?? or Its an Antenna design issue or its a software Issue

It Might not be a Software Issue , because I have test the Code on development Board and it is working.

So could you please let me know what may be the cause of not getting response .


thanks and regards
Manish

In the excel sheet found here: e2e.ti.com/.../375556 you will find a tab called "Range Debug Check List"

Are you able to go through this and do the required measurements?