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  1. #1
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    Pls recommend a PA for 2W/450M/LTE application

    Hi, All,
    Pls recommend a PA for 2W/LTE/450M, which use in railway telecomm.
    The input of the PA is +23dBm, but the output should be +33dBm,
    Which parameters should be consider when select a device for such application?
    Many thanks.
    Best,
    Tony Liu

    •   Alt6th January 2017, 06:31

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    Re: Pls recommend a PA for 2W/450M/LTE application

    LTE @450 MHz ? Is there such band ??



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    Re: Pls recommend a PA for 2W/450M/LTE application

    Hi, Bigboss,
    It's a special band for railway telecomm.

    - - - Updated - - -

    Because it is not a standard band, so I may not find suitable PA in popular vendor, and it's power level is higher than standard, it become harder.
    So I want to find a device to amplify LTE signal and I want to know which parameters should I care, such as what OIP3, or do I need to simulate EVM for it with S-params?
    And old topic, S-params is small signal, now it's high power signal, what params should I use? etc.



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    Re: Pls recommend a PA for 2W/450M/LTE application



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    •   Alt7th January 2017, 13:12

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    Re: Pls recommend a PA for 2W/450M/LTE application

    Hi, Bigboss,
    Are you sure that this device can reach 2W for LTE signal?
    I checked its power at WCDMA, its only +23dBm, so I doubt whether it can reach 2W for LTE signal?
    Best,
    Tony Liu



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    Re: Pls recommend a PA for 2W/450M/LTE application

    Quote Originally Posted by tony_lth View Post
    Hi, Bigboss,
    Are you sure that this device can reach 2W for LTE signal?
    I checked its power at WCDMA, its only +23dBm, so I doubt whether it can reach 2W for LTE signal?
    Best,
    Tony Liu
    It's not been marked for LTE with ACPR condition.I do frankly not know how much power it can supply for LTE signal but it may be around for WCDMA.
    In fact, 2W Output Power @450MHz can be obtained easily by using discrete transistors.You don't have to stick to Integrated solutions.A highly linear 35-36dBm@P1dB Power Amplifier will give you a good response.Class A-( Pushpull AB ) Power Amplifier using with standard LDMOS or GaN transistors can easily be implemented.


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    •   Alt9th January 2017, 16:10

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    Re: Pls recommend a PA for 2W/450M/LTE application

    It's Band 31. Uplink from 452.5 to 457.5MHz, Downlink from 462.5 to 467.5MHz. It was developed to attend fixed termianls in rural areas in Brazil.


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    Re: Pls recommend a PA for 2W/450M/LTE application

    I have used PD55015 from SG to deliver 4W mean or 12W peak in class B. There is also a smaller version PD55008.


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    Re: Pls recommend a PA for 2W/450M/LTE application

    What about RA03M4547MD from Mitsubishi. You have nice margins at input and output, gain is regulated, it's mismach-load protected. Disadvantages? Price.


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    Re: Pls recommend a PA for 2W/450M/LTE application

    Thank you all, all my brothers.
    Best,
    Tony Liu

    - - - Updated - - -

    Filip,
    You recommend RA03M4547MD, but its OIP3 is only about 48dBm, (IMD3=-25dBc@Pout=35dBm), I think it's too low for 2W LTE.



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