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HMC430 or similar VCO output DC-block voltage rating

I wonder what is the maximum voltage rating of the integrated DC-block capacitor of the HMC430 oscillator https://www.analog.com/media/en/technical-documentation/data-sheets/hmc430.pdf or generally HMC Oscillators. The datasheet does not give any details on that unfortunately.

I intent to operate the VCO on a different DC-level, so the output would see approximately 7V DC component., DC-blocked via the internal capacitor.

If possible I want to avoid placing an additional, external series capacitor in the signal line. However, if you tell me I´m on the cutting edge already I would place one for safety reasons, of course.

I would appreciate any hint or ressource. Thanks in advance!

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  • Hi,

    Configuring the RF Output with 7v DC externally applied is not recommended for any of our VCOs as this is known to cause time dependent dielectric breakdown (TDDB). The integrated cap is more sensitive to this effect. A better solution would be to use an external suitably rated cap as the DC blocking cap.

    This would be more a more robust solution and if the external cap failed, the part would not be compromised. 

    Regards,

    Kieran

Reply
  • Hi,

    Configuring the RF Output with 7v DC externally applied is not recommended for any of our VCOs as this is known to cause time dependent dielectric breakdown (TDDB). The integrated cap is more sensitive to this effect. A better solution would be to use an external suitably rated cap as the DC blocking cap.

    This would be more a more robust solution and if the external cap failed, the part would not be compromised. 

    Regards,

    Kieran

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