L22_diode_Trans_Review

# L22_diode_Trans_Review - Plot the voltage transfer...

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V i V 0 1 k 1 k 10 V 5 V D1 D2 Plot the voltage transfer characteristics

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V i V 0 1 k 1 k 10 V 5 V D1 D2 Suppose D2 is OFF D1 is ON when V D1 = 0.7 V - V D1 + V V V i i 3 . 9 7 . 0 10 = = + -
V V i 3 . 9 Both the diodes are OFF, and V 0 = 10 V V V i 3 . 9 < D1 is ON and D2 is OFF 2 7 . 10 2 3 . 9 1 10 0 0 + = + - × - = i i V V k V k V k V I I k I k V i i 2 3 . 9 0 1 7 . 0 1 10 + - = = × + + × + -

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V i V 0 1 k 1 k 10 V 5 V D1 D2 D2 is OFF until: - V D1 + V V ) 7 . 0 5 ( 0 - = V V V V V i i 1 . 2 3 . 4 2 7 . 10 0 - = = + = For V i <-2.1V, D2 is ON V 0 =4.3V
-2.1 9.3 4.3 Vi V 0 D1,D2 Off D1,D2: ON D1:ON,D2: Off

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Plot the voltage transfer characteristics 1 k 1 k 5 V V Z = 2 V V i V 0 + V D - 5 0 5 - = = + + - i D D i V V V V ( 29 V V V V i i D 7 . 5 7 . 0 5 7 . 0 - Diode is forward biased 2 3 . 4 2 5 7 . 0 1 5 0 + = - - × + = i i V k V k V Suppose the diode is not connected
1 k 1 k 5 V V Z = 2 V V i V 0 + V D - 5 - = i D V V ( 29 V V V V V i i D 3 2 5 2 < - < - - < Diode is in Zener mode 2 7 2 5 2 1 5 0 + = - + × + = i i V k V k V V V V i 7 . 5 3 < < Diode is OFF and V 0 = 5 V

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Vi V 0 Zener mode Off Forward biased 3 5.7
Plot the voltage transfer characteristics 1 k 2 V V i V 0 - V D2 + 1 k 4 V + V D1 - D1 D2 V

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86 k 22 k 1.5 k 5.6 k 12 V β F =90
R C V CC R E R B V B 1.5 k 5.6 k = + × = k k k k k R B 52 . 17 22 86 22 86 V V B 44 . 2 108 22 12 = = k I k I EQ BQ 5 . 1 7 . 0 52 . 17 44 . 2 + + = ) 1 1 ( ; F CQ EQ F CQ BQ I I I I β β + = = β F =90 mA I

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