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4.47 In a particular circuit application, ten “20-mA diodes” (a 20-mA diode is a diode that provides a 0.7-V drop when the current through it is 20 mA) connected in parallel operate at a total current of 0.1 A. For the diodes closely matched, what current flows in each? What is the corresponding small-signal resistance of each diode and of the combination? Compare this with the incremental resistance of a single diode conducting 0.1 A. If each of the 20-mA diodes has a series resistance of 0.2

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Answer #1

has the cuxwent Eaah dfede OA CD A Small- sral rest stance Eaah diode has - 2.5 paallel combinalier O25 o diodes O025 dtade conduelin7 Fox one 25 (A Faalle connecton imes the funatian tOx the ent (o oA and this paitalel the T thenk the e Can eufualetto dfode Ts exhtbits the simple diodle hautr lase diade Small- siralresistance oea feduoth Smalles diodes Same -G7

toConedt Nouo Constdex the sextes esfst fade Fos the ance axalMel aombination above 272 utualent istancethe u0Osneed sirple ciode an Corduata the oA sexfes Yesfstarne ast peciftaly O.27 n 3 8 + .27-O25 = ©.O2 8t o 25 = O 27

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Answer 1

has the cuxwent Eaah dfede OA CD A Small- sral rest stance Eaah diode has - 2.5 paallel combinalier O25 o diodes O025 dtade conduelin7 Fox one 25 (A Faalle connecton imes the funatian tOx the ent (o oA and this paitalel the T thenk the e Can eufualetto dfode Ts exhtbits the simple diodle hautr lase diade Small- siralresistance oea feduoth Smalles diodes Same -G7

toConedt Nouo Constdex the sextes esfst fade Fos the ance axalMel aombination above 272 utualent istancethe u0Osneed sirple ciode an Corduata the oA sexfes Yesfstarne ast peciftaly O.27 n 3 8 + .27-O25 = ©.O2 8t o 25 = O 27