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LMH6622: Questions of LMH6622

Jimmy Lai
Expert 6845 points
Part Number: LMH6622

Dear Team,

The requirement is to convert a square wave into a sine wave:
Please help to review whether the sqr2sine circuit is correct, or there are other suggested routes for sqr2sine that you can refer to, thank you!

Many Thanks,

Jimmy

  • 0
    TI__Expert 6050 points

    Hi Jimmy,

    I am looking into the circuit that you provided. Can you provide more information on what the input and the expected output are?

    It looks like you have single supply of 5V. I am also making the following assumptions, can you please correct me if they are incorrect:

    • Input 10MHz square wave centered at 2.5V (can you tell me what the amplitude of the square wave is)
    • Output expected is 10MHz sine wave centered at 2.5V (also unsure of what the expected amplitude is)

    Knowing this information will allow me to verify that the circuit is operating within the input/output limits of the device for this configuration. I will also be able to check the stability of the device and verify the desired output is being achieved.

    Thanks,

    Nick

  • 0 in reply to Nick Nauman
    TI__Expert 6845 points

    Hi Nick,

    We appreciated your great support.

    Thanks for your reply, I am detailing my requirement:
    1. Square wave to sine wave:

    Input 10MHz square wave, Vamplitude=5V, Vmax=5V, Vmin=0V
    Output 10MHz sine wave, Vamplitude=3.3V, centered at 1.65V, Vmax=1.65V, Vmin=-1.65V

    2. Do you have any suggestions on how to design a comparator (TLV3501AIDR) that can support 1.2V and 5.5V 1PPS input swing, thank you very much.

    Jimmy

  • 0 in reply to Jimmy Lai
    TI__Expert 6050 points

    Hi Jimmy,

    Thanks for providing more information about the input and output requirements. I have a few additional questions.

    Are you able to provide more details on what the application or end requirements are for this circuit. It is possible to generate a sine wave from a square wave, but you will face issues such as poor harmonic distortion performance and trying to get a very linear sine wave will also pose some difficulties. If you are able to provide more requirements you are looking to achieve, that would help identify the best solution.

    Also, using a powering using 5V single supply and having an input square wave that matches the supply rails will cause some input/output limitations to the signal. Is there any flexibility in the supply voltage options or input signal amplitude?

    For your second question, please create a separate post for the comparator team as they will be able to provide the best support.

    Thanks,

    Nick