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3,140 Views
Registered: ‎02-18-2010

programmable dds core

Hello,

   I am able to generate desired sine wave  of 2mhz using programmable dds core.but  when i am trying to make it program for 1999500, ie after some time it should produce 1999500 hz,i found it difficult.sample values  are same.plz tell.I want to process  those sample values.

thanks.

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Explorer
Explorer
3,133 Views
Registered: ‎02-27-2010

Re: programmable dds core

You say the samples are the same.  Is this through simulation or a frequency meter?

 

Also, you say you're programming for a frequency yet most DDS cores use a phase increment.  What are the two values you use for the phase increment?  If there are fewer than 12 bits of "actual value" in your value (such as 16'd4095) you won't have better accuracy because of the limited precision of the value you're accumulating.

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