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Attenuation of higher frequencies

Discussion in 'General Electronics Discussion' started by saurabh17g, Apr 17, 2010.

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  1. saurabh17g

    saurabh17g

    72
    0
    Mar 8, 2010
    Hello,
    I am utilizing AD9833 to generate waveform to 10Mhz according to datasheet.
    But after 50KHz, I am getting attenuation. DC level gets added and distortions as well. At 100K, the response is almost DC. I am not able to figure out the reason of such behavior.
    I was expecting that these things would occur after 1MHz. But 50K is too early :(

    Please give me suggestions and possible solutions.
     
  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
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    Jan 21, 2010
    Perhaps a circuit diagram might be helpful?
     
  3. saurabh17g

    saurabh17g

    72
    0
    Mar 8, 2010
    i have attached the circuit diagram.
    it is according to the datasheet of AD9833.
     

    Attached Files:

  4. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,449
    2,809
    Jan 21, 2010
    I hope you're not using C4 in your circuit.
     
  5. saurabh17g

    saurabh17g

    72
    0
    Mar 8, 2010
    I put 100nF as C4.
    There was a problem in PCB and IC was SMD. So, it was desoldered and resoldered. would that be the reason for high frequency attenuation?
     
  6. Mitchekj

    Mitchekj

    288
    0
    Jan 24, 2010
    Try taking C4 out, it's shunting your high frequency to ground. The higher the frequency, the less impedance the cap has to it.
     
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