Map an RF input power to specific value

[John_Jin_Sin]

Hello,

 I am working on a project to protect our receiver part from unwanted input power and have some amplification on the received signal.

To clarify my question, I want to convert -60dbm to 20dbm to -40 to 0dbm.

I design a system with two SP4T RF switches, but it uses many components and needs a prominent space on a PCB.

I would be grateful if you could kindly let me know your suggestion to convert (-60 up to 20) dBm to (-40 up to 0) dBm.

Best regards,

John

[Honey_D]

Hello @John_Jin_Sin ,

Please go through the product portfolio page and application guide for RF Solution and Wireless Communication suitable package.

According to the question it seems you need a LNA which you may also get the information in product page.

If this is not what you are looking for, then please do clarify?

Best Regards,

Honey

[Mathias]

Hello John,

amplifying a signal from -60dBm to 20dBm is a 80dB gain requirement. This is not a simple answer to give, as this will not be a single stage amplification. Our LNA portfolio could be a first stage option for you. Which one, will for sure depend on the frequency range you need to operate.  The output power of 20dBm need another amplification stage and here the calculation will be more complicated. check the linearity requirement of your signal, keep sufficient margin to the compression point and check intermodulation requirement of your system.

For the switch,  I would assume that you separate the input signal to 4 different amplification pathes that match your range criteria. Not fully sure how you implemented it to be clear on a comment to make it with less components. You could use the switch between the amplification stages for different power reduction or else. 

So point is, to help you further it is important to have more information.

best regards

Mathias

[John_Jin_Sin]

Dear Mathias and Honey,

I really appreciate your swift responses and your explanations.

Sorry if I explained my question not very well. I am curious to find a circuit which can convert input signals ranging from -60dbm to 20dbm (input signal is between -60dbm to 20dbm) to output signals from -40dbm to 0dbm. It means -60dbm at input needs an amplification of 20dbm to become -40dbm, and 20db at the input needs -20db attenuation.

Frequency: 7-8Ghz

So I want to know what is your idea to design a system that can do the above procedure.

I am thankful for your time to read and think about my problem.

Best regards,

John

[Honey_D · Accepted solution]

Hello John,

For the conversion of input signal we would suggest you to use either LNA or Ultra low noise RF Transistors from the portfolio. Check the devices with higher ft value which are suitable for your frequency range and gain requirement.

Please go through these link and select the appropriate product for your application:

https://www.infineon.com/cms/en/product/rf/low-noise-amplifier-lna-ics/general-purpose-lnas/bga614/

https://www.infineon.com/cms/en/product/rf/low-noise-amplifier-lna-ics/general-purpose-lnas/bga616/

https://www.infineon.com/cms/en/product/rf/rf-transistor/low-noise-rf-transistors/bfp843f/ 

https://www.infineon.com/cms/en/product/rf/rf-transistor/low-noise-rf-transistors/bfp640fesd/ 

Refer to RF Transistor- Product Portfolio in the following document

https://www.infineon.com/dgdl/Infineon-Infineon-RF_Discretes_Selection_Guide-BC-v02_01-EN(1)-Product...

Hope this helps!

Best Regards,

Honey