- #1

EvLer

- 458

- 0

Not even sure how to title this thread. I am saying honestly: we did not cover this in class but he gave us this in homework!

Two identical linear systems are connected in cascade. When the input signal to the first stage is x(t) the output signal from the first stage is y(t), the output of the second stage is z(t). If an input signal, tu(t) is applied to a single stage, the output signal of that stage is : [tex] (e^{-2t}-1)u(t)[/tex] find z(t) if x(t) = u(t).

u(t) is a step function, u(t) = 1 if t >=0, and 0 otherwise;

what i was thinking of doing is converting the e...-expression to frequency domain and also the tu(t) and then seeing how input is modified to get the output and apply the same thing to u(t) which is the input into cascaded system, but TA said that there's multiplication involved in s-domain. I am sort of clueless...

If someone could explain or direct to a source, that would be very much appreciated, 'coz my book does not these examples and i don't even know what to seach for on Google!

maybe i am not making a connection to something...the latest we covered was circuit analysis in frequency domain doing nodal analysis.

Two identical linear systems are connected in cascade. When the input signal to the first stage is x(t) the output signal from the first stage is y(t), the output of the second stage is z(t). If an input signal, tu(t) is applied to a single stage, the output signal of that stage is : [tex] (e^{-2t}-1)u(t)[/tex] find z(t) if x(t) = u(t).

u(t) is a step function, u(t) = 1 if t >=0, and 0 otherwise;

what i was thinking of doing is converting the e...-expression to frequency domain and also the tu(t) and then seeing how input is modified to get the output and apply the same thing to u(t) which is the input into cascaded system, but TA said that there's multiplication involved in s-domain. I am sort of clueless...

If someone could explain or direct to a source, that would be very much appreciated, 'coz my book does not these examples and i don't even know what to seach for on Google!

maybe i am not making a connection to something...the latest we covered was circuit analysis in frequency domain doing nodal analysis.

Last edited: