CC1120: 940 to 960 MHz operation

Darren Jenkins

Part Number: CC1120

Hi Sub 1 Ghz team,

A customer is designing two boards. One will be Rx only, and the other will be Tx only. The frequency range is 940 to 960 MHz.

I'm expecting the CC1120EM-868-915-RD is a good starting point for the Rx.

On the Rx only board, can you give any guidance on how they should modify the components on the RF path to get the best performance at this frequency range? Are there passive components on the PA and TRX_SW pins that can be left off the board since it is Rx only?

Thanks,

Darren

over 2 years ago

+1 RGW over 2 years ago

TI__Mastermind 29560 points

Hi,

I would not expect to much degradation from 915 MHz to 960 MHz so I would use the base design as a starting point. I would measure the output power and sensitivity at 915 MHz and compare it to 960 MHz. Rx is normally quite wide band so I would only expect a small degradation on the Tx side of 0.5 - 1.0 dB.

For a pure Rx design, the Tx and Rx paths can be divided and the Rx path can be configured as shown below in yellow: