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posted by  bexnicious on 7/22/2008 1:53:19 AM  |  status: Live  

voltage-controlled currrent source

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Question Details:
The circuit shown below is a model of an audio amplifier. The volume (current to the
speaker) is regulated via R2.

a) Use mesh current analysis to find the current i in the circuit.
Use the values:V = 24[V]             gm = 0.2[S]
                        R1 = 50[Ω]          R2 = 1.2[kΩ]
                        R3 = 330[Ω]        R4 = 440[Ω]
b) What is the amplifier efficiency? How much power is used by R4 relative to the
power generated in the two sources.

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posted by boon(EE-SME) on 7/22/2008 5:15:07 AM  |  status: Live
Asker's Rating: None Provided    Moderator's Rating: N/A
Response Details:
Given circuit is
 
Applying KVL to the mesh1 we have
................. (1)
Applying KVL to the super mesh we have
................ (2)
From the circuit
                                                        since
Substituting in equation(2)

Substituting in equation(1)


 and
(b)
Power delivered in is
Power genereated in voltage source is
Power genereated in dependent current source is
Voltage across the current source
Now power
Amplifier efficiency,
Hope this helps you...
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