Figure 20-1
-A certain pulse waveform has a rise-time 6 nS and a fall-time of 9 nS. What is the highest frequency component in the waveform?
A) 117 MHz
B) 58.3 MHz
C) 23.3 MHz
D) 38.9 MHz

Question

Figure 20-1
-A certain pulse waveform has a rise-time 6 nS and a fall-time of 9 nS. What is the highest frequency component in the waveform?
A) 117 MHz 
B) 58.3 MHz 
C) 23.3 MHz 
D) 38.9 MHz

Quizplus · Accepted Answer

The highest frequency component in a pulse waveform can be approximated using the formula $f = \frac{0.35}{\tau}$, where $\tau$ is the smaller of the rise or fall time if they are significantly different. In this case, the rise time is 6 ns, so using this value, $f = \frac{0.35}{6 \times 10^{-9}} \approx 58.3$ MHz.

Figure 20-1 -A Certain Pulse Waveform Has a Rise-Time 6 NS and NS