The combined resistor value of N gates in parallel is: Rtotal = (1/N) Rgate
The load resistor decrease as we connect more input gates, let us calculate the logic-1 level with a load resister of 10k Ohms. Using Ohm's law:
Vout = 3.5v * (10,000 / N) / [ 1000 + (10,000 / N) ] > 1.7v
( where Vsource = 3.5, Rsource = 1000 and the threshold for indeterminate values is 1.7v )
we get: 1700N < 18,000, so the maximum number we can connect is ten or so.
gs408 said:Hi, pretty basic question, I'm looking through some notes and it says:
What does the 10k load resistor refer to? Is it the resistance of one gate? Or the combined resistance of multiple gates? Just wanted to clarify.
Thanks.
The purpose of calculating fan-out resistance is to determine the overall resistance of a circuit when multiple gates are connected in parallel. This is important for ensuring the stability and functionality of the circuit.
To calculate fan-out resistance, you can use the formula Rf = R1 + R2 + R3 ... + Rn, where Rf is the overall resistance and R1-Rn are the individual resistances of each gate. You can also use a parallel resistance calculator to simplify the process.
The main factors that affect fan-out resistance are the individual resistance values of each gate, the number of gates in parallel, and the quality of the connections between the gates.
Fan-out resistance is important for circuit design because it helps ensure that the circuit has stable and reliable functionality. If the fan-out resistance is too high, it can cause voltage drops and affect the performance of the circuit.
Some precautions to take when calculating fan-out resistance include using accurate resistance values for each gate, making sure the connections are secure, and double checking the calculations to ensure accuracy.