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Combination of Resistors

Consider the ...

Question

$C o n s i d e r t h e c i r c u i t s h o w n i n t h e f i g u r e b e l o w . T h e i n p u t t o t h e c i r c u i t V_{i n} = 10 s i n (w t) . I f t h e d i o d e s D_{1} a n d D_{2} b o t h h a v e c u t i n v o l t a g e o f 0.7 V, t h e n w h i c h o f t h e f o l l o w i n g s t a t e m e n t a r e t r u e ?$

D i o d e D_{1} w i l l a l w a y s b e i n O F F s t a t e .

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D i o d e D_{1} w i l l s w i t c h O N f o r V_{i n} > 0.7 V .

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B o t h t h e d i o d e D_{1} a n d D_{2} w i l l n e v e r t u r n O N .

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D i o d e D_{2} w i l l s w i t c h O N f o r V_{i n} < 0 V

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Solution

The correct option is A $D i o d e D_{1} w i l l a l w a y s b e i n O F F s t a t e .$
$W h e n V_{i n} < - 0.7 V D_{2} w i l l S w i t c h O N a n d D_{1} w i l l a l w a y s r e m a i n i n O F F s t a t e . B u t w h e n V_{i n} > - 0.7 V b o t h d_{1} a n d D_{2} w i l l r e m a i n i n O F F s t a t e . N o t e : w h e n V_{i n} > - 0.7 V D_{2} w i l l b e O F F b e c a u s e o f r e v e r s e b i a s i n g . B u t d_{1} w i l l b e O F F a s t h e r e w i l l n o t b e a n y d r o p a c r o s s r e s i s t o r R_{1} . S i n c e n o c u r r e n t w i l l f l o w i n t h e c i r c u i t a n d V_{i n} = V_{o u t} .$

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