Hi there,
I've developed a ring oscillator (sort of a school project):
I used the following circuit for this:
MOSFET: https://assets.nexperia.com/documents/datasheet/BSS84.pdf
Now when is connect this SMD circuit to an oscilloscope, i've got a frequency of 260 kHz. In the simulation in spice i've got a frequency of 187 kHz. That's fine.
Now when i want to calculate the frequency by myself:
Ring Oscillator: 1/(2*n*t(p)) ___ n = amount of gates,,, t(p) is gate delay
i get really weird numbers for the frequency or gate delay.
e.g. when i fill in the frequency in this formula, for 5 gates. I get a gate delay of around 40 us, which in my idea is way too much.
I've also found another formula: t(p) = (C*dV)/I(d)
still i get really weird numbers out of these formulas. Can anybody help me out with this?
Thanks in advance! I hope i've been clear enough.
Daan
I've developed a ring oscillator (sort of a school project):
I used the following circuit for this:
MOSFET: https://assets.nexperia.com/documents/datasheet/BSS84.pdf
Now when is connect this SMD circuit to an oscilloscope, i've got a frequency of 260 kHz. In the simulation in spice i've got a frequency of 187 kHz. That's fine.
Now when i want to calculate the frequency by myself:
Ring Oscillator: 1/(2*n*t(p)) ___ n = amount of gates,,, t(p) is gate delay
i get really weird numbers for the frequency or gate delay.
e.g. when i fill in the frequency in this formula, for 5 gates. I get a gate delay of around 40 us, which in my idea is way too much.
I've also found another formula: t(p) = (C*dV)/I(d)
still i get really weird numbers out of these formulas. Can anybody help me out with this?
Thanks in advance! I hope i've been clear enough.
Daan
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