In the circuit of Figure P6.71, let V E E = V C C = 5 V , β = 100 , V A = ∞ , R L = 1 kΩ , and R S = 0 . (a) Design the circuit such that the small-signal voltage gain is A υ = υ o / υ s = 25 and V E C Q = 3 V . (b) What are the values of the small-signal parameters g m , r π , and r o ?
In the circuit of Figure P6.71, let V E E = V C C = 5 V , β = 100 , V A = ∞ , R L = 1 kΩ , and R S = 0 . (a) Design the circuit such that the small-signal voltage gain is A υ = υ o / υ s = 25 and V E C Q = 3 V . (b) What are the values of the small-signal parameters g m , r π , and r o ?
Solution Summary: The author explains the circuit parameters for the given specifications. For the DC analysis circuit, removing ac sources and making capacitor open.
In the circuit of Figure P6.71, let
V
E
E
=
V
C
C
=
5
V
,
β
=
100
,
V
A
=
∞
,
R
L
=
1
kΩ
, and
R
S
=
0
. (a) Design the circuit such that the small-signal voltage gain is
A
υ
=
υ
o
/
υ
s
=
25
and
V
E
C
Q
=
3
V
. (b) What are the values of the small-signal parameters
g
m
,
r
π
, and
r
o
?
7 The function of a loudspeaker crossover network is
to channel frequencies higher than a given crossover
frequency, f-, into the high-frequency speaker
(tweeter) and frequencies below f. into the
low-frequency speaker (woofer). Figure P6.37 shows
an approximate equivalent circuit where the amplifier
is represented as a voltage source with zero internal
resistance and each speaker acts as an 8-2 resistance.
If the crossover frequency is chosen to be 1,200 Hz,
evaluate C and L. Hint: The break frequency would be
a reasonable value to set as the crossover frequency.
10 Vms
R1
R2
R1 = R2 = 8 2
ww
The parameters for each transistor in the circuit shown in Figure P6.75 areβ = 100 and VA = ∞. (a) Determine the small-signal parameters gm , rπ ,and ro for both transistors. (b) Determine the small-signal voltage gainAv1 = vo1/vs, assuming vo1 is connected to an open circuit, and determinethe gain Av2 = vo/vo1. (c) Determine the overall small-signal voltage gainAv = vo/vs. Compare the overall gain with the product Av1 · Av2, using thevalues calculated in part (b)
6.12 The parameters of the transistor in the circuit in Figure P6.12 are ß = 150
and VA = 0. (a) Determine R1 and R2 to obtain a bias-stable circuit with
the Q-point in the center of the load line. (b) Determine the small-signal
voltage gain A, = v,/vs.
v* = +5 V
Rc=1.2 kQ
Cc
R2
Rg = 0.2 k2
V==-5V
Figure P6.12
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