- The I region is intrinsic, in the P-Y-N structure shown. Determine the quantities in (a) and (c). Assume that no bias is applied. (Hint: It may be helpful to think of the I region as P type N₁ = 5 x 1016 cm -3 0.5 μη a P or N and then let the doping concentration approach zero. That is, Nd Na ≈0.) a- Find the built-in potential. b- Calculate the maximum electric field. N type N₁ = 3 × 1016 cm -3 c- Find the depletion-layer width (Wdep) and its widths on the N side (xn) and the P side.

Consider an idealized diode with a reverse saturation current 0.01 mA and an abrupt turn-on voltage of 0.7 V (assume no breakdown and operation away from the knee of the diode curve). For the circuit shown, both resistors are 100 2, the constant source is Vp = 5 V, and the time-dependent source is V3 = 20 sin(at) V. Calculate (a) the peak positive voltage V and the associated current through the diode and (b) the peak negative voltage V and the associated current through the diode. Rulamting R Vs + > KHI

24 A M0-volt forwurd voltage is applied to a silicon diode in series with a load of 3 k2. Draw the de kud line. What is the slope of the line? Solution The value of voltage Vy across diode is given by Vy V-R Since R and V are fixod values, this equation can by represented by a straight line on V-ly characteristics of diode; the is de kud li. When lg 0, maximum voltage across the diode V 30 V. This is point B(30, 0). 10 mA 30 V Fig. 2.25 Problem 2.4.

In the figure given we have u(t)=10. cosot [V]. We assume the diodes and the A-meter (A) to be ideal. A u(t) a) Plot the waveform of the current flowing through the A-m in scale. b) What is the reading of the A-m, if it is moving-coil type? c) What is the reading of the A-m, if it is moving-iron type? d) Calculate the power factor of the WHOLE structure. R1 1 R2 102

Q1: In this Zener diode regulator, the source voltage varies from 6 V to 14 V. Assume that the load current  varies between 1 mA and 35 mA, and that the diode is an ideal 4 V Zener diode. What is the largest allowable resistance  that will ensure the load voltage  remains constant with variations in load current and source voltage? Please enter your answer to 3 significant figures. Q2: Given the circuit design for a Zener diode regulator in the Ques 1, what is the maximum power that will be dissipated by the Rs resistor? You are told that the source voltage Vs  varies from 6 V to 11 V, the load current il varies between 2 mA and 45 mA, and the diode is an ideal 3 V Zener diode. You will need to recalculate the maximum allowable resistance Rs with your new values, as part of this question. Please enter your answer to 3 significant figures, and in Watts.

Design a voltage-regulator circuit to provide a constant voltage of 5 V to a load from a variable supply voltage. The load current varies from 0 to 100 mA, and the source voltage varies from 8 to 10 V. You may assume that ideal Zener diodes are available. Resistors of any value may be specified. Draw the circuit diagram of your regulator, and specify the value of each component. Also, find the worst case (maximum) power dissipated in each component in your regulator. Try to use good judgment in your design. Repeat Problem P9.29 if the supply voltage ranges from 6 to 10 V.

) State whether the following statements are true or false and then correct the false ones. i. In pn-junction diodes, the reverse saturation current stays constant regardless of the ambient temperature. i Under steady state, the overall charge of the depletion region in a diode equals zero. The peak inverse voltage of a pn-diode decreases with temperature. The reverse recovery time of a diode determines the magnitude of the forward diode current.

Design a voltage-regulator circuit to provide a constant voltage of 5 V to a load from a variable supply voltage. The load current varies from 0 to 100 mA, and the source voltage varies from 8 to 10 V. You may assume that ideal Zener diodes are available. Resistors of any value may be specified. Draw the circuit diagram of your regulator, and specify the value of each component. Also, find the worst case (maximum) power dissipated in each component in your regulator. Try to use good judgment in your design.

Consider the diode circuit shown below. If in the given circuit, Vs is replaced by a 12V battery and diodes D1 & D2 are considered ideal, what is the potential Vout equal to?

Here are some statements about a p-n junction diode. Some are TRUE and some are FALSE. i. Applying a negative bias to the p-side and a positive bias to the n-side allows a forward current flow. ii. When the p-n junction is under reverse bias, the Fermi level is continuous across the junction. iii. The forward bias current is made up of holes from the p-side and electrons from the n-side flowing across the junction. iv. Under reverse bias, you can get minority electrons flowing from the p-side to the n-side of the junction. v. To get a large built-in voltage, you need to heavily dope the p-side and n-side of the junction. vi. The built-in voltage (or contact potential) of a p-n junction is typically twice the value of the band-gap of the semiconductor. Which of the following statements is correct: (i) and (ii) are both FALSE (ii) and (v) are both FALSE (iii) and (vi) are both FALSE