an interview question

taofeng

hi,
% A9 {/ M: r. s) s   attached is an interview question ! interesting reader can have a look and discuss it.
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regards,
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jef

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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$ W1 w4 h7 P7 v* E$ b- e: v& Lregards,

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
kankan la

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