b) The diode is to be used in the AND logic circuit shown in figure Q1b : VDD R VA VB 0 0 0 1 Vo Case 3 VA K Vo IL=0 Case 2 1 VB 1 1 Case 1 Figure Q1b : Diode - Resistor AND Gate The inputs are assumed to be at rail values where a logic High, '1', is VoD = 5V, and a logic Low, 'O', is OV. Referring to the above truth table : i) What will the output voltage V, in case 1? ii) Evaluate the value of the resistor R required to make the threshold voltage for Vo be 1V when operating in case 2. ii) Using this value of R evaluate Vo for case 3. See the Q1 solutions page at the end of the paper

Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Under controlled conditions a diode's current is modelled by
the equation :
Question 1
I, = 1,(exp(kV)–1)
where ID is the diode current, V the 'forward biased' diode voltage, Is is the
reverse leakage current and k is a diode specific constant.
b)
The diode is to be used in the AND logic circuit shown in figure Q1b :
VDD
VA VB
Vo
Case 3
VA
V.
IL=0
1
Case 2
1
VB
1
1
Case 1
Figure Q1b : Diode - Resistor AND Gate
The inputs are assumed to be at rail values where a logic High, '1',
is VDD = 5V, and a logic Low, 'O', is OV. Referring to the above truth table :
i)
What will the output voltage V. in case 1?
ii)
Evaluate the value of the resistor R required to make the
threshold voltage for Vo be 1V when operating in case 2.
Using this value of R evaluate Vo for case 3.
ii)
See the Q1 solutions page at the end of the paper
Transcribed Image Text:Under controlled conditions a diode's current is modelled by the equation : Question 1 I, = 1,(exp(kV)–1) where ID is the diode current, V the 'forward biased' diode voltage, Is is the reverse leakage current and k is a diode specific constant. b) The diode is to be used in the AND logic circuit shown in figure Q1b : VDD VA VB Vo Case 3 VA V. IL=0 1 Case 2 1 VB 1 1 Case 1 Figure Q1b : Diode - Resistor AND Gate The inputs are assumed to be at rail values where a logic High, '1', is VDD = 5V, and a logic Low, 'O', is OV. Referring to the above truth table : i) What will the output voltage V. in case 1? ii) Evaluate the value of the resistor R required to make the threshold voltage for Vo be 1V when operating in case 2. Using this value of R evaluate Vo for case 3. ii) See the Q1 solutions page at the end of the paper
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