BGT24MTR11 LNA characteristics

[ielopez]

Dear Infineon Community,

I am currently using the radar MMIC BGT24MTR11. To increase the SNR at reception I am considering introducing an LNA before the receiver. I wanted to known whether this made sense.

I have seen in the datasheet (pag 13 of https://www.infineon.com/dgdl/Infineon-BGT24MTR11-DS-v03_01-EN.pdf?fileId=db3a304339dcf4b10139def491...) that the noise figure ("SSB noise figure") typically is 12 dB. Does this noise figure refer to the noise figure of the LNA?

I also wanted to know in the "Voltage Conversion Gain" (pag 13 of the datasheet) refers to the gain fof the LNA.

I am grateful for your help.

Best regards,

[Deepa_V · Accepted solution]

Hi @ielopez ,

There is already an LNA present internally in BGT24MTR11 as you must have seen in the block diagram for the same. You can place an LNA externally as well, if you feel it's required as per your end application. 

Additionally, for clarification, the receiver section, on the whole, has a single-sideband Noise Figure of 12 dB and a voltage conversion gain of 26 dB. The gain of the LNA can be reduced by a typical gain-step of 5 dB. Please refer section 4.5.2 of https://www.infineon.com/dgdl/Infineon-D2G_Application_Note_AN543_v1.5-ApplicationNotes-v01_05-EN.pd... for further details. 

Hope this helps ! 

Best regards,

Deepa