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EliteTUM
 3 years ago
How do I solve Q4 of H8P3  Memory "Time to Charge Capacitance Q2 to VOH"?
I tried using the first order dynamics equation:
VOH = VG2max + (VOLVG2max) * exp(t/TAU)
with TAU = R*CGS
and R = RON + RPU  ROFF
but I get t = 122.669 ps which seems to be wrong.
EliteTUM
 3 years ago
How do I solve Q4 of H8P3  Memory "Time to Charge Capacitance Q2 to VOH"? I tried using the first order dynamics equation: VOH = VG2max + (VOLVG2max) * exp(t/TAU) with TAU = R*CGS and R = RON + RPU  ROFF but I get t = 122.669 ps which seems to be wrong.

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olimpiacaj
 3 years ago
Best ResponseYou've already chosen the best response.0I did the same and get the same result....

EliteTUM
 3 years ago
Best ResponseYou've already chosen the best response.0at least no error in my numbers but rather in my formula. I'll take a depper look again by tomorrow.

olimpiacaj
 3 years ago
Best ResponseYou've already chosen the best response.0if i find de solution e post

rsousa
 3 years ago
Best ResponseYou've already chosen the best response.0VS=5.0V, VOH=3.5V, VIH=3.0V, VIL=0.9V, VOL=0.5V The gatesource capacitance CGS=3.5fF and VT=1.0V. RON=1900.0Ω, ROFF=105.0MΩ and RPU=12.0kΩ. can you tell me why this is wrong? (3.54)/(0.54) = exp(t/τ) exp(t/τ) = 0.142857142857 t/τ = ln(0.142857142857) = 1.94591014906 t = T * 1.94591014906 R = 1900 + ((12000 * 105000000)/(12000 + 105000000)) = 13898.6287281 = 13.8986287281 kΩ T = RC = 13898.6287281 * 3.5E15 = 4.86452005484e11 t = 4.86452005484e11 * 1.94591014906 = 9.46591894502e11 = 94.6591894502 ps

EliteTUM
 3 years ago
Best ResponseYou've already chosen the best response.0that is the same calculation as above, just different values. Still, I don't know whats wrong with it.

olimpiacaj
 3 years ago
Best ResponseYou've already chosen the best response.0I did the same reasoning but with different values and also not getting the correct answer
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