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Dave Tweed
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I have tried using 2 method but I'm getting different answers in both methods.in

in the first case I assumed Vce=Vcc/2 and Vcc-IcRc=Vce For

For maximum power transfer Vcc/(2√2)Icc/(2√2)=VccIcc×Icc/(2√2)=Vcc×Icc/8=20W Vcc

Vcc/2=IcRc RC

RC comes out to be 1.8 But

But when I go for the formula (Vcc)^2/(8Rc)=20W I'm getting Rc=3.6 why is that so??   

enter image description here

I have tried using 2 method but I'm getting different answers in both methods.in the first case I assumed Vce=Vcc/2 Vcc-IcRc=Vce For maximum power transfer Vcc/(2√2)Icc/(2√2)=VccIcc/8=20W Vcc/2=IcRc RC comes out to be 1.8 But when I go for the formula (Vcc)^2/(8Rc)=20W I'm getting Rc=3.6 why is that so??  enter image description here

I have tried using 2 method but I'm getting different answers in both methods.

in the first case I assumed Vce=Vcc/2 and Vcc-IcRc=Vce

For maximum power transfer Vcc/(2√2)×Icc/(2√2)=Vcc×Icc/8=20W

Vcc/2=IcRc

RC comes out to be 1.8

But when I go for the formula (Vcc)^2/(8Rc)=20W I'm getting Rc=3.6 why is that so?? 

enter image description here

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user351581
user351581

Power Amplifier Class A

I have tried using 2 method but I'm getting different answers in both methods.in the first case I assumed Vce=Vcc/2 Vcc-IcRc=Vce For maximum power transfer Vcc/(2√2)Icc/(2√2)=VccIcc/8=20W Vcc/2=IcRc RC comes out to be 1.8 But when I go for the formula (Vcc)^2/(8Rc)=20W I'm getting Rc=3.6 why is that so?? enter image description here