Why is the fanout of CMOS gates frequency dependent?
A) The input gates of the FETs are predominantly capacitive, and as the signal frequency increases the capacitive loading also increases, thereby limiting the number of loads that may be attached to the output of the driving gate.
B) Each CMOS input gate has a specific propagation time and this limits the number of different gates that can be connected to the output of a CMOS gate.
C) The higher the number of gates attached to the output, the more frequently they will have to be serviced, thus reducing the frequency at which each will be serviced with an input signal.
D) When the frequency reaches the critical value, the gate will only be capable of delivering 70 of the normal output voltage and consequently the output power will be one-half of normal; this defines the upper operating frequency.
Question 2
Propagation delay is important because ________.
A) it limits the maximum operating frequency of a gate
B) the logic gates must be given a short break during each clock cycle or else they will overheat
C) all the gates in a system must have the same propagation times in order to be compatible
D) it is a measure of how long the clock must be applied to the gate before it will make the required decision
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