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CC2745R10-Q1: CC2745R10-Q1

zheng xiaoke
Prodigy 10 points
Part Number: CC2745R10-Q1

Tool/software:

你好，咨询一下问题：

1、蓝牙射频匹配，芯片ANT引脚端是50Ω设计吗，阻抗匹配时芯片是否需要上电处于某个状态。

2、芯片与天线之间是否需要隔离，我看参考设计上没有。都是匹配器件。

3、阻抗匹配时需要注意哪些。

麻烦解答，感谢！

  • 0
    TI__Genius 14785 points

    Hello,

    I believe I was able to translate the question:

    1, Bluetooth radio frequency matching, chip ANT pin end is 50 Ω design, impedance matching the chip need to power up in a certain state.

    2, the chip and antenna need to be isolated, I see reference design does not. Are all matching devices.

    3, the impedance matching needs to be aware of what.

    If possible, do you mind translating your questions to English, or confirming the translation above is correct? 

    Best,

    Nima Behmanesh

  • 0 in reply to Nima
    Prodigy 10 points

    没错，问题翻译的没问题

  • 0 in reply to zheng xiaoke
    TI__Genius 14785 points

    Hello,

    I've assigned this thread to an expert. They should respond next week.

    Best,

    Nima Behmanesh

  • 0 in reply to Nima
    TI__Intellectual 2520 points

    Hello,

    1. The antenna pin of the IC has an input impedance of 50ohms. So the entire RF circuit it designed for system impedance of 50ohms. I don't understand your question about powering up the IC in a specific state. The input impedance of the ANT pin is always 50ohms no matter what state the device is in.

    2. CA2 in the reference design schematic you attached is a DC blocking cap and ensures there is no DC path from the ANT pin of the IC to GND through the PCB antenna. This keeps the IC and antenna DC isolated. 

    3. I'm not sure what you're asking with this question, but the entire RF circuit is impedance matched to 50ohms. 

    Regards,

    Andrew