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Original question:

AWR1843AOP: Why is the Tx EIRP and Noise Figure different for 1843Boost vs 1843AOP

AWR1843AOP: The Loss of Receiver is 8dB from the calculation of EINF?

Wayne Tsao
Prodigy 50 points
Part Number: AWR1843AOP
Other Parts Discussed in Thread: AWR6843AOP, , AWR6843

Hello TI,

According to the reply of aozer, the EINF=Receiver Noise Figure Figure + Antenna Gain - Loss.

If insert the numbers of AWR6843AOP into the equation above, EINF(9dB)=Receiver Noise Figure Figure(12dB)+Antenna Gain(5dBi)-Loss(?), can we say the loss of receiver is 8dB?

  • 0
    TI__Expert 5170 points

    Dear Wayne,
    Thank you for contacting us at E2E. We sincerely value your connection with our team.

    I regret to inform you that our expert is currently away from the office. We understand the importance of your query and would like to assure you that it will receive the attention it deserves as soon as possible.

    Please anticipate a comprehensive response by next week. We are grateful for your patience and understanding during this time.

    Kind regards,
    Anirban

  • 0
    TI__Mastermind 27085 points

    Hello,

    Can you please confirm if you are asking in regards to AWR6843AoP or AWR1843AoP? Your title mentions AWR1843AoP but your post is discussing AWR6843AoP.

    Regards,

    Adrian

  • 0 in reply to aozer
    Prodigy 50 points

    Hello Aozer,

    I am asking in regards to AWR6843AOP.

  • +1 in reply to Wayne Tsao
    TI__Mastermind 27085 points

    Hello,

    For the AoP device, the 5dBi gain is already including the losses. This is also the typical gain, however gain will not be constant across PVT. Similarly, the 12dB noise figure is typical, so there will be variation across frequency/temperature/process corner. 

    The correct way to compute EINF is 12dB NF - 5dBi antenna gain = 7dB EINF, but this number does not necessarily match the datasheet. It seems like there must have been some averaging across temperature/frequency/process corner variation to obtain the value of 9dB EINF.


    Regards,

    Adrian 

  • 0 in reply to aozer
    Prodigy 50 points

    Thanks Adrian for your reply.

    From your answer I plot following link-budget equation with the values from data sheet of AWR6843AOP and AWR6843. The numbers seems quite good in the equation but maybe the equation is wrong. Please correct me if I am understanding wrong.

    • For Transmitter, .EIRP(15dBm) = Tx Power (12dBm) - loss(2dB) + Antenna Gain (5dBi)
    • For Receiver, Noise Figure(12dB) = EINF(9dB) –loss(2dB) + Antenna Gain (5dBi)
  • +1 in reply to Wayne Tsao
    TI__Mastermind 27085 points

    Hello,

    Yes, your calculations are correct.

    Regards,

    Adrian

  • 0 in reply to aozer
    Prodigy 50 points

    Dear Adrian,

    Thank you so much, I really appreciate your help. Have a nice day.

    Wayne