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Somebody please explain how early effect changes Vbe. I know that: with changes in collector-base voltage the width at the collector-base junction varies causing current due to minority carriers add up to the collector current. But how does Vbe get affected here ?
The small change in vbe is due to the degenerative feedback current, as I described in post #4. Note however, that the current caused by the Early effect is indpenedent of vbe. To see this, note that current goes up as vbe goes down.
I didn't say that current is independent of vbe. I said current due to the Early effect is independent of vbe. In other words, the current is composed of two components, the normal 'forward' transconductance current which is dependent on vbe, and the current that is dependent on VCE. That current, independent of vbe, is degenerative and decreases vbe ( notice I don't say here is vbe in independent of output curret ) If you read up on it, you would see I"m correct.