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Original question:

DAC3283: phase noise detail of the part-Reg

DAC3283: DAC Fundamentals: NSD to Phase noise Reg.

Deva Guru
Prodigy 205 points
Part Number: DAC3283

HI TI Team,

In the thread "">e2e.ti.com/.../dac3283-phase-noise-detail-of-the-part-reg" , I enquired about the close in phase noise data (from 10Hz of fundamental) of DAC.

NSD plots of the part was shared as reference.

1)Isn't NSD used as a metric to characterize wide band phase noise/ Noise floor?

2)I was wondering, is there a way to calculate the below needed Close in phase noise from NSD data?

Offset          Phase noise(dBc/Hz)

100Hz

1KHz

100KHz

Thanks in advance,

Deva

  • 0
    TI__Guru 70254 points

    Hi,

    Deva Guru said:
    )Isn't NSD used as a metric to characterize wide band phase noise/ Noise floor?

    Correct. NSD was measured in dBm/Hz. It is measured 20MHz away from the fundamental tone so the impact of close-in phase noise is not contributing to the measurement. We use in lab signal generator as clock source to minimize the noise of the clock to the DAC itself.

    Deva Guru said:

    2)I was wondering, is there a way to calculate the below needed Close in phase noise from NSD data?

    Offset          Phase noise(dBc/Hz)

    100Hz

    1KHz

    100KHz

    Unfortunately, no. the close in phase noise will need to be measured. The close-in phase noise will be dependent on:

    1. clock source to the DAC

    2. power supply source to the DAC.