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EEE 123 S2 2024-2025
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For the circuit shown, D1 has a cut-in voltage of 0.6 V and a forward resistance of 10 Ω while D2 has a cut-in voltage of 0.7 V and a forward resistance of 5 Ω. You may assume that both diodes will be conducting. if RS = 21 Ω, determine the current being supplied by the 5 V source. Express your answer in milliamperes accurate to one decimal point.
If Va = Vb = 0 V and Vc = 5 V, solve for Vout. (in volts).
The transistors in the circuit are identical, where VTH = 1 V and k = 2 mA/V2.
Use the resistor model when the NMOS is in the linear mode of operation.
If Vc = 5 V, what is the value of RDS,on, or the the drain-to-source resistance, of Q3? (In ohms. Provide at least 2 digits after the decimal point.)
The NMOS circuit shown below implements a logic function where the voltage inputs are at Va, Vb, and Vc, and the voltage output is taken at Vout
What is the logic operation performed by the circuit if A is applied at Va, B is applied at Vb, and C is applied at Vc? The output Y is taken at Vout.
What is Vout? (In volts. Provide at least 3 digits after the decimal point.)
What is RDS,on of Q1? (In ohms, provide at least 2 digits after the decimal point.)
If Va = Vb = 5 V and Vc = 0 V. What is RDS,on of Q2? (In ohms. Provide at least 2 digits after the decimal point)
Note that VTH = 1 V and k = 2 mA/V2.
Solve for the drain current (in mA). Provide at least 3 digits after the decimal point.
If 6.8 and 1.8 , what is the absolute value of the voltage across in volts?
A varactor is a circuit element that stores charge depending on the voltage applied to it in a nonlinear manner. The total charge stored on the device after being charged for a long time can be modeled by using the simple approximation:
where is the total stored charge in coulombs, is the voltage applied to the device in volts, and and are arbitrary parameters dependent on the manufacturing of the device measured in coulombs per volt and volts, respectively. The device initially has no charge stored and a constant 6.6 volts is applied to the device. If the device finished charging after , what is the average power needed to charge the device in ? Let and .
(Hint: total energy is equal to voltage multiplied to charge)