Solution of ECE 315 Test 12 F04
Below are some descriptions of filters in the forms of impulse responses, frequency-response
magnitudes and circuit diagrams. For each of these, classify the filters as CT or DT, ideal (I) or practical
(P), causal (C) or non-causal (NC) lowpass (LP), highpass (HP), bandpass (BP) or bandstop (BS). If a
filter is impossible to classify in a certain category from the description just leave it blank.
CT or DT
I or P
C or NC
LP, HP, BP or BS
h(t)
CT
I
NC
t
LP
h[n]
n
DT
I
NC
BP
|H(jΩ)|
1
DT
P
______
BS
(Cannot determine causality without a phase plot.)
-2 π
2π
Ω
|H( F )|
1
DT
P
______
BP
(Cannot determine causality without a phase plot.)
-1
+
R
+
vin(t)
CT
P
C
BP
(All real physical systems are practical and causal.)
F
1
C
-
L vout(t)
| H( jω ) |
1
ω
CT
P
______
LP
(Cannot determine causality without a phase plot.)
h(t)
t
CT
I
NC
HP
h(t)
t
CT
I
NC
BP
h(t)
-0.5
CT
P
C
HP
-12
L
+
vin(t)
CT
P
C
LP
(All real physical systems are practical and causal.)
+
R
vout(t)
-
+
-
i i(t) C
vi (t)
CT
P
C
HP
(All real physical systems are practical and causal.)
t
2
+
vo(t)
R
-
-
| H(F) |
...
...
-1
DT
I
NC
(All ideal filters are non-causal.)
HP
1
F