HMC536LP2, HMC629A, HMC802A: internal bias of RF pins

Hello,

I want to use RF switch HMC536 and RF attenuators HMC802, HMC629 for broadband application (LF...C-band). There is a requirement to use appropriate DC blocking capacitor in the datasheet on the RF input/output. Let assume that these parts are cascaded directly. My question is, if the internal DC pre-bias of RF pins is identical or very similar. Thus the DC decoupling capacitors can be omitted, RF pins routed directly and the RF performance is expected to be a better. Or is there any note about the DC voltage on RF pins in the datasheet?

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  • +1
    •  Analog Employees 
    on Nov 8, 2019 2:15 PM over 1 year ago

    Hi,

    RF pins of HMC802A and HMC629A are dc biased Vdd. HMC536 has no supply input so its RF pins are dc biased by high voltage applied to one of the control pins.

    If supply voltage of HMC802A and HMC629A and high control voltage of HMC536 are same, there is no need to use dc blocking capacitors on RF line interconnecting these devices.

    Best.

Reply
  • +1
    •  Analog Employees 
    on Nov 8, 2019 2:15 PM over 1 year ago

    Hi,

    RF pins of HMC802A and HMC629A are dc biased Vdd. HMC536 has no supply input so its RF pins are dc biased by high voltage applied to one of the control pins.

    If supply voltage of HMC802A and HMC629A and high control voltage of HMC536 are same, there is no need to use dc blocking capacitors on RF line interconnecting these devices.

    Best.

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