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Ahmed Alfadhel

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Posts posted by Ahmed Alfadhel

  1. I am beginner to Neural Network (NN) design,

    could you instruct me about how to implement a linear activation function by VHDL ?

    I need a simple example of implementation a linear activation function by VHDL.

    Thanks

  2. On 5/25/2021 at 8:45 PM, user3416 said:

    Could you please provide the code to operate the DDS core and Pmod or provide some guidance on how I can achieve my goal.

    @user3416 Hi,

    You need to create your block diagram (DDS IP, PmodDA3 IP, GPIO IP, Microblaze,....) , then you have to embed C code using XSDK (the C code for instructing the IPs how to interact with each other).

    Yon can benefit from my project resources here:

    https://www.hackster.io/ahmed-alfadhel/frequency-hopping-spread-spectrum-fhss-system-c72dde 

  3. Hi @D@n

    Thank you for your perfect analyzing and solution to my issue .

    I just toggled the MSB in each written Byte and I got the sinewave finally.

    However, I wondered , since in the data sheets (AD5541A , AD7303) is mentioned I have to use operation amplifier in order to get a bipolar signal ! 

    Thanks again. 

      

     

     

     

     

    5kHz.jpg

    5kHz_smoother.jpg

    DA1_Bipolar.JPG

    DA3_bipolar.JPG

  4. Hi ,

    I am using DDS IP core to visualize a 5 kHz sine wave signal. 

    At first I simulated the IP core using Vivado simulator . I used 25 MHz clock signal. I got a sine wave signal as shown in the first attached picture. 

    When I changed the Radix from "signed data type" to "unsigned data type" the sine wave will be like in the second attached picture.

    And when I implemented my design on my ARTY 7 , and connected the output of Pmod DA3 to the oscilloscope , I got a signal similar to that in the second attached picture ! As shown in the third attached picture . 

    I changed all the intended data types in my program from u16 to s16 but the no thing is changed ! 

    Pls , I am looking forward your help. How to visualize a DDS sine wave properly using Pmod DA3 ?

    Thanks.

    s1.JPG

    s2.JPG

    photo_2019-04-18_00-59-57.jpg

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