The differential amplifier shown in Figure P 11.60 has a pair of pnp bipolars as input devices and a pair of npn bipolars connected as an active load. The circuit bias is I Q = 0.2 mA , and the transistor parameters are β = 100 and V A = 100 V . (a) Determine I 0 such that the de currents in the diff-amp are balanced. (b) Find the open-circuit differential-mode voltage gain. (c) Determine the differential-mode voltage gain if a load resistance R L = 250 k Ω is connected to the output.
The differential amplifier shown in Figure P 11.60 has a pair of pnp bipolars as input devices and a pair of npn bipolars connected as an active load. The circuit bias is I Q = 0.2 mA , and the transistor parameters are β = 100 and V A = 100 V . (a) Determine I 0 such that the de currents in the diff-amp are balanced. (b) Find the open-circuit differential-mode voltage gain. (c) Determine the differential-mode voltage gain if a load resistance R L = 250 k Ω is connected to the output.
Solution Summary: The author calculates the value of the I_O for the balanced dc current condition for a given differential amplifier circuit.
The differential amplifier shown in Figure P 11.60 has a pair of pnp bipolars as input devices and a pair of npn bipolars connected as an active load.
The circuit bias is
I
Q
=
0.2
mA
,
and the transistor parameters are
β
=
100
and
V
A
=
100
V
.
(a) Determine
I
0
such that the de currents in the diff-amp are balanced. (b) Find the open-circuit differential-mode voltage gain. (c) Determine the differential-mode voltage gain if a load resistance
R
L
=
250
k
Ω
is connected to the output.
Answer the following questions:
1- Write radiation resistance (R.) equation for infinitesimal dipole antenna.
2- Write the angle expression form of first null beam width (FNBW) for 2/2 dipole.
3- Define the Directivity of antenna.
4- Write radar cross section equation.
5- Write the input impedance (Z) expression of lossless transmission line.
The input reactance of an infinitesimal linear dipole of length 1/60 and radius
a = x/200 is given by
[In(/2a) - 11
X-120-
tan(kl/2)
Assuming the wire of the dipole is copper with a conductivity of 5.7 × 10'S/m.
determine at f = 1 GHz the
(a) loss resistance
(b) radiation resistance
(c) radiation efficiency
input impedance
Q4- a) For the block diagram of control system shown below with its unit step response. Determine
(K, a,damping ration, Maximum overshoot, Wn, Wd,ẞ, ts, tp, td, tr, and overall transfer function?
C(1) ↑
1.4
1.2
1
0.8
0.6
0.4
0.2
R(s)
E(s)
K
C(s)
$(s + α)
0.05
0.1
0.15
0.2
+2%
-2%
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