CC1121: CC1121: Problem with PA burning out when using a high gain exterior whip antenna??

Martin Kutscher

Part Number: CC1121

Is there any possibility of harming the PA if it transmits max power while the antenna is disconnected from the coax cable??

8 months ago

0 Haiatullah Gholami 8 months ago

TI__Intellectual 2960 points

Hi Martin,

No, that is very unlikely. Can you provide more details on why you think that the PA is damaged?

Is this a custom board?

Regards,

0 Martin Kutscher 8 months ago

Prodigy 55 points

We have 2 transceivers on a board both are using the reference design. Xceiver One is using an internal antenna 2dBi, xceiver two is using an external antenna 15dBi whip. The units with failed transceiver chip are all xceiver two. Pin 17 (PA) has a pull-up to 3.3V with a 10 Ohm resistor. A good xceiver measure 3.27V on this pin the bad xceivers measure 1.7V on this pin. Thanks for the help, Martin

0 Haiatullah Gholami 8 months ago in reply to Martin Kutscher

TI__Intellectual 2960 points

Hi Martin,

Did you measure 3.3V on pin 17 on the receiver two before you started the transmission?

Could you upload the schematic and layout of your design so that I can take a look?

Regards,

Sub-1 GHz

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CC1121: CC1121: Problem with PA burning out when using a high gain exterior whip antenna??