(a)
To find: The quiescent collector currents in transistors.
(a)
Answer to Problem 15.68P
The quiescent collector currents in transistors are
Explanation of Solution
Given:
Given LM380 power amplifier circuit as
Calculation:
Assuming matched input transistor and neglecting the base currents. For zero input voltages, the currents in
Since
Hence, the collector current is
Since, the collector currents of
Therefore,
Conclusion:
Therefore, the quiescent collector currents in transistors are
(b)
To find: The quiescent currents inD1, D2, Q7, Q8 and Q9.
(b)
Answer to Problem 15.68P
The quiescent currents are
Explanation of Solution
Given:
Diodes D1 and D2 and transistors Q7, Q8, Q9 are all matched.
Calculation:
The currents in
Hence, the emitter currents of transistor
Therefore, the diode currents are
The voltage across base of
From the circuit given
Thus, the collector current through the transistor
Now, substitute all values in the above expression we have
The base emitter voltages across the transistor
Since,
Taking exponential on both sides,
As the above equation is in the form of polynomial equation, hence the roots are
Thus, the required collector current at transistor
Now, substitute the value of
Thus, the required collector current at transistor
Now, substitute the value of
Thus, the required collector current at transistor
Conclusion:
Thus, the quiescent currents are
(c)
To calculate: The quiescent power dissipated in the amplifier.
(c)
Answer to Problem 15.68P
The required power is
Explanation of Solution
Given LM380 power amplifier circuit as
Calculation:
For no load,
The power dissipated in the amplifier is
Conclusion:
Therefore, the required power is
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Chapter 15 Solutions
Microelectronics: Circuit Analysis and Design
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