LTC6406 equivalent output capacitance

Question

LTC6406, Page 17 of the datasheet shows the o/p network that look like a series 50&Omega; resistor with a 3.75pF capacitor shunting each filtered output to AC ground. 
 Having simulated the o/p the 3.75pF is certainly correct. How is the capacitor value arrived at for this combination of 1.25pF capacitors.

GLADION · Accepted Answer

Hi natural_inquisitive , 
 
 Good day. The capacitors, as seen in Figure 6, were connected in delta. So, by finding its equivalent Y (star) connection, you'll get a 3.75 pF each ( Ceq = 3C = 3*1.25 pF). Each would look like a series 50&Omega; resistor with a 3.75pF capacitor shunting each filtered output to AC ground. 
 
 Hope this helps. 
 Regards, 
 Gilbeys)

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LTC6406 equivalent output capacitance

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