(a) Assume the circuit shown in Figure 6.40(a) is biased at I Q = 0.25 mA and assume transistor parameters β = 100 and V A = 100 V . Assume the small−signal nonlinear collector resistance is r c = 100 kΩ . Determine the small−signal voltage gain. (b) Repeat part (a) assuming that a small−signal load resistance of r L = 100 kΩ is connected between the output terminal and ground. (Ans. (a) A υ = − 769 ; (b) A υ = − 427 )
(a) Assume the circuit shown in Figure 6.40(a) is biased at I Q = 0.25 mA and assume transistor parameters β = 100 and V A = 100 V . Assume the small−signal nonlinear collector resistance is r c = 100 kΩ . Determine the small−signal voltage gain. (b) Repeat part (a) assuming that a small−signal load resistance of r L = 100 kΩ is connected between the output terminal and ground. (Ans. (a) A υ = − 769 ; (b) A υ = − 427 )
Solution Summary: The author explains the value of small signal voltage gain and transconductance.
(a) Assume the circuit shown in Figure 6.40(a) is biased at
I
Q
=
0.25
mA
and assume transistor parameters
β
=
100
and
V
A
=
100
V
. Assume the small−signal nonlinear collector resistance is
r
c
=
100
kΩ
. Determine the small−signal voltage gain. (b) Repeat part (a) assuming that a small−signal load resistance of
r
L
=
100
kΩ
is connected between the output terminal and ground. (Ans. (a)
A
υ
=
−
769
; (b)
A
υ
=
−
427
)
For the circuit given in figure below draw the collector characteristic curves for IB = 50,150 and 250 micro amperes on the same graph
Q6:A) A transistor dissipates 50W in an ambient temperature of 60°C.The thermal resistance are
exc-0.5
the junction temperature without a heat sink.
Determine the thermal resistance of the heat sink to avoid the junction exceeding 170°C.
°CW¹,0a-4°CW.Determine
5%
single polver supply
QUESTION 4
In this voltage divider bias circuit, the input is at the base. Output is at the emitter
with a high input resistance and low output resistance. The maximum voltage gain
is 1 and the coupling capacitors must have a negligible reactance at the frequency
of operation. (use to answer a and b)
a. Derive the expression for the voltage gain, current gain, and power gain in
terms of power delivered to the load, RL.
b. Sketch both the DC and AC equivalent circuits.
c. Derive the expression for ripple factor of Half Wave Rectification with a
capacitor filter.
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