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CC2595: Question of CC2595 spec.

na na78
Guru 16770 points
Part Number: CC2595

Hi

We are considering a circuit like the following image.


TI's CC2595 would be used to improve output level attenuation.
The band requirement is 2.4GHz.

RF_TRX, RX switch and filter are already implemetend, so it is difficult to select other solution
(like a one chip solution), instead of existing circuit.

Questions:

1. What is the input/output impedance of CC2595?
Do you have information?

2. I think it should be needed impedance matching circuit at input/output stage of CC2595.
Is this understanding correct?

3. What is the value of RBIAS1/2?

If you have any notice, please tell us.

BestRegards

  • 0
    TI__Genius 15975 points

    Hi,

    1. The input/output impedance of CC2595 is 50-ohms.

    2. Yes, there is a need for impedance matching at input/output stage of CC2595. You could take a look at the CC2595 evaluation module http://www.ti.com/lit/ug/swru362/swru362.pdf for the input/output matching circuitry.

    3. The value of RBIAS1/2 seems to be 20kohms. You could take a look the circuit in the evaluation module.

    Best Regards,

    Rohit

  • 0 in reply to Rohit Bhat
    Guru 16770 points

    Hi

    Thank you for your reply.

    According to the datasheet and user guide, there exists AVDD_PA2 path from VDD to the output like following.

    What is the purpose of it?  Do we need to make 50ohm impedance matching?

    And its current consumption seems to be about 95mA at Pin=0dB.  Is my understanding correct?

    BestRegards

  • 0 in reply to na na78
    TI__Genius 15975 points

    Hi,

    The purpose of the 12nH inductor between the VDD and RF_out is to provide proper biasing in Class-A output operation. I think it is optimized already for 50-ohm impedance matching at the output.

    Yes, the current consumption is about 95mA at Pin=0dBm.

    Best Regards,

    Rohit