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About RF Front End

sboyer
Prodigy 20 points
Other Parts Discussed in Thread: CC2591, CC2430

In cc2591 Datasheet, cc2591 and cc243x are connected. I am very confused that why a cc2591 is used here. In cc2430 design specification, cc2430 could connected to a antena directly, but cc2591 is added here, why? What is the differences between the two design? Thanks.

  • TI__Intellectual 2795 points

    Hello,

    CC2591 is a RF front end and can as you state be connected directly to the CC2430 as a range extender.  CC2430 is on the other hand a system on chip solution for 2.4 GHz IEEE 802.15.4 / ZigBee. So the difference is that the CC2430-CC2591 solution would give you better link budget by providing a power amplifier for increased output power, and a Low Noise Amplifier with low noise figure for improved receiver sensitivity compared to the CC2430 stand alone solution.

    /delete

  • in reply to delete
    Prodigy 20 points

    Your answer really help me, I'm grateful.

  • Prodigy 190 points

    The CC2430 has a balanced (differential) output and can only be connected to a balanced antenna. However it still requires a matching circuit to match the output impedance of the CC2430 with the impedance of the PCB traces (transmission lines) and the antenna (usually 100 ohms). In  most designs, you will see that it is connected to an unbalanced antenna (single-ended). In order to do this, you need to connect it to a balun (balance/unbalance) circuit to make the signal single-ended and then a matching circuit to match the single ended impedance to the impedance of the antenna (usually 50 ohms).

    Most people that use the CC2591 also want increased range and the CC2591 splits the singal path into a transmit path and a receive path. On the transmit path, it adds an RF power amplifier to increase the range and the receive path it has a low noise amplifier to improve the sensitivity. In addition to this, it also has the balun and an internal configurable matching circuit.

    Hope that helps.