1. For the Class A output stage below. ???-10 V. R,-5 kS2. ???.sat-200 mV. RL 1
ID: 2293145 • Letter: 1
Question
1. For the Class A output stage below. ???-10 V. R,-5 kS2. ???.sat-200 mV. RL 1 k? and the average DC output voltage. ??.Q-0 V. Find: a) The maximum average output power that can be delivered to R before clipping occurs and the corresponding efficiency. What is the maximum possible efficiency with this stage and what value of Ri is required to achieve this efficiency'? Calculate the maximum possible instantaneous power dissipation in Qi. Also calculate the average power dissipation in Q1 when the peak output voltage is 1.5 V andd is a sinusoic b) Vcc ?? R3 Vo Q3 2 Vcc -VccExplanation / Answer
The Maximum average output power that can be transfered to load can be determined by using Maximum Power transfer theorem which states that " when the Resistive value of the load is equal in value to that of the voltage sources internal resistances allowing maximum power to be supplied.
Generally, this source resistane or even impedance if inductors or capacitors are involved is of fixed value in ohms.
However, when we connect a load resistance,RL across the output terminals of the power source,the impedance of the load will vary from an open circuit sate to a short circuit sate resulting in the power being obsorbed by the load becoming depending on the impedance of theactual power source.Then for the load resistance to obsorb the maximum power possible it has to be "matched" to the impedance of the power source and this forms the basis of
maximum power transfer.
it is calculated by using these equations
I=Vs /Rs+RL and P= I2RL
Table of current against power
From the above figure please note that for an open circuit power is zero and also for a short circuit zerovoltage
The above table clearly depicts that the Maximum power transfers occurs in the load when the load resistance, RL=Rs=25ohms this is called matched condition
RL(ohms) I (Amps) P(Watts) 0 4.0 0 15 2.5 93 25 2.0 100Related Questions
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