Will it be possible to feed in a reference clock to the ADALM-PLUTO?

I'm interested in whether it would be possible to use the ADALM-PLUTO time-of-arrival localization. This requires a very stable clock. I wonder whether it will be possible to feed in an external reference clock? In the revision-B schematics, it looks like there is no connector or jumper to switch from the built-in 40MHz oscillator to an external clock.

Also, if I do feed the clock from an external source (even if this involves removing the 40MHz oscillator), how difficult will it be to switch from 40MHz to 10Mhz? I see that the AD9363 does support 10MHz clocks, but will it is reasonably easy to configure the firmware for this clock frequency?

Thanks, Sivan Toledo, Tel-Aviv University

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  • Thanks for rapid answer, Michael.

    I have used square wave, may be this was a problem.

    I have assembled oscillator back now.

    I'll remove it and try sine now.

    1. cat /sys/kernel/debug/clk_summary did not work for me.

    See teraterm output below:

    1. cat /sys/kernel/debug/clk_summary

    cat: can't open '/sys/kernel/debug/clk_summary': No such file or directory

    1. cd /sys/kernel/debug

    2. ls

    bdi                 hid                 pm_qos              suspend_stats

    ci_hdrc.0           ieee80211           ras                 usb

    clk                 iio                 regmap              wakeup_sources

    fault_around_bytes  memblock            regulator           zynq_rst

    gpio                pinctrl             sleep_time

    #

    Boris.

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  • Thanks for rapid answer, Michael.

    I have used square wave, may be this was a problem.

    I have assembled oscillator back now.

    I'll remove it and try sine now.

    1. cat /sys/kernel/debug/clk_summary did not work for me.

    See teraterm output below:

    1. cat /sys/kernel/debug/clk_summary

    cat: can't open '/sys/kernel/debug/clk_summary': No such file or directory

    1. cd /sys/kernel/debug

    2. ls

    bdi                 hid                 pm_qos              suspend_stats

    ci_hdrc.0           ieee80211           ras                 usb

    clk                 iio                 regmap              wakeup_sources

    fault_around_bytes  memblock            regulator           zynq_rst

    gpio                pinctrl             sleep_time

    #

    Boris.

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