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AWR1843: About Ripple question

yimin bai34
Genius 4755 points
Other Parts Discussed in Thread: IWR6843

Hi Sir 

We saw the spec about Table 5-2. Ripple Specifications in below link

www.ti.com/.../awr1843.pdf

a. what is the test condition for ripple spec

b. what is the test method for ripple spec

c.we used scope with FFT calculation condition. the test condition is full running. Is it correct ? 

d. Does IWR6843 also use the same condition ? 

please advise

BR

Yimin

  • 0
    TI__Guru*** 148514 points
    Hi,

    We have to check with characterization team and get back to you

    Thank you
    Cesar
  • 0
    TI__Mastermind 30065 points
    Hello Yimin,

    I am sorry for the delayed response. I am still looking into this and will get back to you with an answer soon.

    Regards,

    Adrian
  • 0
    TI__Mastermind 30065 points

    Hello Yimin,

    a. The 1.3V (1.0V) and 1.8V power supply ripple specifications are defined to meet a
    target spur level of –105dBc (RF Pin = –15dBm) at the RX. The spur and ripple levels have a dB to dB
    relationship, for example, a 1dB increase in supply ripple leads to a ~1dB increase in spur level. Values
    quoted are rms levels for a sinusoidal input applied at the specified frequency.

    b. The ripple spec is determined by injecting a ripple of a specified frequency on top of the supply voltage by using a summing amplifier. The decoupling caps are removed from the board for the given supply that is being tested. The amplitude of the ripple signal is then measured at the pin of the device to account for any losses across the PCB and amplifier circuit. The spur is then observed on the TX output and RX channels. Based on the amplitude of the spur and the amplitude of the ripple signal at the pin the tolerance for a -105dBc spur is then calculated.

    c. Can you please clarify this questions? I am not exactly sure what you are asking, but we configure the sensor for a continuous wave so the device is operating at 100% duty cycle during testing.

    d. Yes, the same is used for all of our devices.

    Regards,

    Adrian