AWR2243: How to decide Rx Gain and RF_Target_Gain

Ken Zhang

Part Number: AWR2243

Hi Experts

When we set the Rx gain, RF_Target_Gain also needed to be considered.

"RX gain is achieved as a sum of RF gain and IF amplifiers gain, Recommended value for AWR2243 is 36dB ", The RF Gain Target allows the user to control the RF gain independently from the total RX gain, thus giving flexibility to the user to trade-off linearity vs. noise figure"

My questions are as follows:

1. Should we always set RF_Target_Gain as 36dB for AWR2243, unless some saturation behavior is observed?

2. Will different RF_Target_Gain affects the noise figure? in my understanding noise figure is decided by Rx Gain as the datasheet shows.

Thanks

Ken

over 2 years ago

+1 Vivek Dham over 2 years ago

TI__Guru 58035 points

Hello Ken,

For RF gain target, its recommended to always use max 36dB setting to get the best noise figure. The RX gain needs to be set based on the highest signal level expected at the RX input.

regards,
vivek

0 Ken Zhang over 2 years ago in reply to Vivek Dham

TI__Expert 3395 points

Hi Vivek

According to the pic, if we set Rx gain as 40dB, the NF is 12dB. Will NF drops if RF gain target is not set as 36dB?

Vivek Dham said:
For RF gain target, its recommended to always use max 36dB setting to get the best noise figure.

+1 Vivek Dham over 2 years ago in reply to Ken Zhang

TI__Guru 58035 points

Hello Ken,

That is correct. The plot assumes 36dB RF gain target setting. reducing the RF gain target could degrade the NF.

Regards,

vivek

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AWR2243: How to decide Rx Gain and RF_Target_Gain