POWER 


Figure 1: A buck converter with hot loop ESRs and ESLs


IN HF ripple waveforms in IN. IN ripple magnitude and a lower ringing


 


IN ripple  


IN 


expensive. FastHenry/FastCap is a free tool based on partial element equivalent circuits (PEEC) numerical modelling1


and can provide


 to explore different layout designs,   parameter extraction in FastHenry/FastCap  2,3


. 


 extract PCB ESRs and ESLs.


Hot Loop PCB ESR and ESL vs. Decoupling Capacitor Position


IN position 


 


IN step-down buck converter module in a tiny   


integrates a small HF ceramic CIN inside,   


IN IN1 


IN and IN1 directly 


 


IN2 is still placed    larger ESL and ESR are expected compared  


CIN3 IN and IN3 


IN 


Figure 3: Vertical Hot Loop 2: (a) top view and (b) side view JULY/AUGUST 2023 | ELECTRONICS FOR ENGINEERS 31 Figure 2: Vertical Hot Loop 1: (a) top view and (b) side view


an increased loop impedance compared to      


IN  


SW ringing frequency and IN ripple magnitude.


     


   


IN   package sizes and placement positions are  


          more cases are investigated based on Case


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