an interview question

taofeng

hi,
   attached is an interview question ! interesting reader can have a look and discuss it.
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regards,

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cirand

Vbe=0.7, 流过base的电流很小，可以忽略，故而Vce=0.7X10/7=1V

taofeng

what if Ibase is not so small ??
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jesseyu

I's not like that, the VBE is not necessarily 0.7V in such configuration. ICE=(0.7VCE/Rb)*Beta, then IR=I-ICE. Just my opinion

kukyxu

Vbe=0.7, 流过base的电流很小，可以忽略，故而Vce=0.7X10/7=1V
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kj.guo

这是一个self bias 的结构，通常Ib可以忽略，Vbe=0.7v，所以Vce=1v