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# set02new - ECE3050 Homework Set 2 1 A diode has the...

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ECE3050 Homework Set 2 1. A diode has the parameters I S = 10 fA , n = 2 , and V T = 25 mV . (a) Calculate r d for V D = 0 . 6 V . r d = nV T I D + I S = nV T e V D /nV T I S = 30 . 72 M (b) Calculate r d for V D = 0 V . r d = nV T I S = 5 × 10 12 (c) At what voltage does r d exceed 10 15 ? V D = nV T ln μ nV T I S r d = 0 . 265 V 2. A diode current-controlled attenuator circuit is shown. It is given that R = 20 k . The diode parameters are n = 2 and V T = 0 . 025 V . (a) Calculate the bias current which will provide a small-signal attenuation of 20 dB , i.e. v o /v s = 0 . 1 . I = 2 nV T R " μ v o v s 1 1 # = 45 µ A (b) If the current is halved, what is the new attenuation? ( 14 . 8 dB ). (c) If the current is doubled, what is the new attenuation? ( 25 . 6 dB ) 3. A diode has the current I D 1 = 1 mA for V D 1 = 0 . 55 V and I D 2 = 2 mA for V D 2 = 0 . 58 V . If I S ¿ I D 1 , determine the ideality factor or emission coe cient n and the saturation current I S . n = V D 2 V D 1 V T ln ( I D 2 /I D 1 ) = 1 . 73 I S = I D 1 exp ( V D 1 /nV T ) = I D 2 exp ( V D 2 /nV T ) = 3 . 03 nA 4. The diagram shows a zener diode regulator. It is given that

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set02new - ECE3050 Homework Set 2 1 A diode has the...

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