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how to improve the phase noise of AD9912

Question asked by fenfei on Nov 19, 2010
Latest reply on Dec 9, 2010 by DSB

    what's the residual phase noise of DAC in AD9912? The datasheet doesn't have this specification. I use a signal generator outputing 1GHz to drive the AD9912. The phase noise of 1GHz is lower than -119dBc/Hz @10kHz offset.The DDS output is 40MHz,according to 20logN ,the phase noise of 40MHz should be about -146dBc/Hz @10kHz offset.But the test shows  output phase noise is only -135dBc/Hz @10kHz offset.

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