engineering recuitment GATE ECE 2023-24 Test Series Signals and Systems Introduction To Signals and Systems Types of Systems
The symbols, a and T, represent positive quantities, and u(t) is the unit step function. Which one of the following impulse responses is NOT the output of a causal linear time-invariant system?
1
e+at u(t)
2
e-a(t + T) u(t)
3
1 + e-at u(t)
4
e-a(t - T) u(t)