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 =10fA , n =2 ,and V T =25mV . (a) Calculate r d for V D =0 . 6V . r d = nV T I D + I S = nV T e V D /nV T I S =30 . 72M (b) Calculate r d for V D =0V . r d = nV T I S =5 × 10 12 (c)Atwhatvo ltagedoes r d exceed 10 15 ? V D = nV T ln μ nV T I S r d = 0 . 265V 2. A diode current-controlled attenuator circuit is shown. It is given that R =20k . The diode parameters are n =2 and V T =0 . 025V . (a) Calculate the bias current which will provide a small-signal attenuation of 20dB ,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 . 8dB ). (c) If the current is doubled, what is the new attenuation? ( 25 . 6dB ) 3. A diode has the current I D 1 =1mA for V D 1 =0 . 55V and I D 2 =2mA for V D 2 =0 . 58V .I f I S ¿ I D 1
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set02new - ECE3050 Homework Set 2 1. A diode has the...

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