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发表于 2012-5-3 15:53:53
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my understanding: Q10-R-Q13-Q11-Q10 feedback loop, so Vq11,c=Vq10,c, as long as the loop holds, the above voltage is vbe11=vbe10+2i*R, where i=Vtln4/(2R), vbe11 cannot be a zero-temp dependent voltage. basically, this right half circuit generates a ptat current, biasing the left half~, that why a ptat current is necessary is purely determined by the application. |
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