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Consider a non-ideal diode with standard diode equation iD =iS[ exp (vD/vT)-1] iD=1.7mA,if vD is changed by 2mVolts then what will be th change in iD? Express in micro Amperes.
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Asked by miaowmira1900 | 05 Aug, 2019, 12:06: AM
answered-by-expert Expert Answer
begin mathsize 14px style D i o d e space e q u a t i o n space colon negative space space space i subscript D space equals space i subscript S space open square brackets space e x p open parentheses v subscript D over v subscript T close parentheses space minus space 1 close square brackets space space space equals space i subscript S space e x p open parentheses v subscript D over v subscript T close parentheses space space minus space i subscript s space space.............. left parenthesis 1 right parenthesis D i i f e r e n t i a t e space e q n. left parenthesis 1 right parenthesis comma space w e space g e t comma space space space d i subscript D space equals space i subscript s space e x p open parentheses v subscript D over v subscript T close parentheses space 1 over v subscript T space d V subscript D space........... left parenthesis 2 right parenthesis I n space e q n. left parenthesis 2 right parenthesis comma space space i subscript s space e x p open parentheses v subscript D over v subscript T close parentheses space almost equal to space i subscript D space space f r o m space e q n. left parenthesis 1 right parenthesis space space b e c a u s e space d a r k space c u r r e n t space i subscript s space less than less than space i subscript D H e n c e space c h a n g e space i n space d i o d e space c u r r e n t space space d i subscript D space i s space o b t a i n e d space f r o m space e q n. left parenthesis 2 right parenthesis space a s space d i subscript D space equals i subscript D space space cross times space 1 over v subscript T space cross times space d V subscript D space equals space fraction numerator 1.7 cross times 10 to the power of negative 3 end exponent cross times 2 cross times 10 to the power of negative 3 end exponent over denominator 26 cross times 10 to the power of negative 3 end exponent end fraction space equals space 130.77 cross times 10 to the power of negative 6 end exponent space A end style
Answered by Thiyagarajan K | 05 Aug, 2019, 07:55: AM

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