simulation of a superheterodyne receiver using pspice - School of ...
simulation of a superheterodyne receiver using pspice - School of ...
simulation of a superheterodyne receiver using pspice - School of ...
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Fig. 31: Audio amplifier.<br />
Dc conditions (with 20V-power supply):<br />
I<br />
C 3.623mA<br />
BJT Q9 (pre-amplifier stage): β<br />
DC<br />
= = = 167. 5<br />
I 21.63uA<br />
B<br />
α<br />
DC<br />
= 0.994<br />
I E<br />
= 3.64mA<br />
r'<br />
e = 6.9Ω<br />
I<br />
C 3.817mA<br />
BJT Q10 (below diodes): β<br />
DC<br />
= = = 14. 7<br />
I 260.1uA<br />
B<br />
α<br />
DC<br />
= 0.994<br />
2k<br />
V B<br />
= 20 = 3. 33V<br />
(Pspice value = 2.9V)<br />
(10 + 2) k<br />
V E<br />
= 3 .33 − 0.7 = 2. 63V (Pspice value = 2.128V)<br />
I E<br />
= 2.63mA<br />
r'<br />
e = 9.5Ω<br />
I<br />
C 21.89mA<br />
BJT Q11 (npn transistor in power amp): β<br />
DC<br />
= = = 162<br />
I 135.1uA<br />
B<br />
α<br />
DC<br />
= 0.994<br />
32
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