2019 Problem 01
2019 Problem 01
Consider the following circuit topology where the input v(in) transitions Hi-Lo-Hi. Assume Rdrv = Rodt = R.
We make the following two observations.
■ When the input transitions high low the output net discharges through R; with a time constant τ_fall = RC.
■ When the input transitions low high the output net charges through R/2; with a time constant τ_rise = (R/2)C.
■ When the input transitions high low the output net discharges through R; with a time constant τ_fall = RC.
■ When the input transitions low high the output net charges through R/2; with a time constant τ_rise = (R/2)C.
Choose the correct answer.
(a) The reasoning is not right. The correct answer should be τ_rise = τ_fall.
(b) The reasoning is not right. The correct answer should be τ_rise > τ_fall.
(c) The reasoning is right. The correct answer is τ_rise < τ_fall.
(d) The reasoning is right for small C. The correct answer is τ_rise < τ_fall.
(a) The reasoning is not right. The correct answer should be τ_rise = τ_fall.
(b) The reasoning is not right. The correct answer should be τ_rise > τ_fall.
(c) The reasoning is right. The correct answer is τ_rise < τ_fall.
(d) The reasoning is right for small C. The correct answer is τ_rise < τ_fall.