Decoupling network for HMC943APM5E

Hi - The HMC943APM5E datasheet shows a requirement for 3 decoupling caps per qty. 8 Vd and qty. 2 Vg pins; that is a total of 30 capacitors.  Do you have any recommendations for a simplified decoupling network that will result in performance that meets the datasheet performance (including over temp).  For example, tying all pins at the device and bulking up capacitance in less overall capacitors?

Thanks!



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[edited by: EZADI_123 at 6:12 PM (GMT 0) on 9 May 2020]
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  • +1
    •  Analog Employees 
    on May 26, 2020 3:17 PM

    Hi Fernando,

    This is generally difficult to determine without testing:

    1. 4.7uF are power supply noise reduction capacitors so need for them depends on your pcb.

    But at least you can reduce their number if for example you are using the same voltage point for supplying Vdd1...4, in that case you can use only on 4.7uF. This also applies for Vgg pins.

    2. Need for other caps here depends on your pcb therefore I can not say anything with certainty without testing.

    Regards

    Ivan

Reply
  • +1
    •  Analog Employees 
    on May 26, 2020 3:17 PM

    Hi Fernando,

    This is generally difficult to determine without testing:

    1. 4.7uF are power supply noise reduction capacitors so need for them depends on your pcb.

    But at least you can reduce their number if for example you are using the same voltage point for supplying Vdd1...4, in that case you can use only on 4.7uF. This also applies for Vgg pins.

    2. Need for other caps here depends on your pcb therefore I can not say anything with certainty without testing.

    Regards

    Ivan

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