electrical engineering assignmnet
aliaqi
hw3-3.pdf
1
ECE2280 Homework #3 Use the circuit to the right for problems 1 and 3. 1. Assume all diodes are identical and have VDO=0.7V, n=2, 𝑉! =25mV. Use the constant voltage drop method. Verify that your assumptions for the diode operation(i.e. on or off) are correct. Find the following assuming that D1 and D2 are both on for the operation of the diodes.
a) State your assumptions (diode is on/off). b) The current ID1 c) The current ID2 d) The voltage Vo e) Verification to prove or disprove your
assumptions for the diodes are correct. 2. Repeat problem 1 assuming that D1 is on and D2 is off. 3. Use the correct assumptions for D1 and D2. If there is noise on the -10V supply that increases it sometimes to as much as -9V and sometimes as low as -11V, what is the MAXIMUM value for Id1 (the DC and AC current through diode, D2). {Hint: remember to use the AC model for the diode} Use the circuit to the right for problems 4 and 6. 4. Assume all diodes are identical and have VDO=0.7V, n=2, 𝑉! =25mV. Use the constant voltage drop method. Assume D1 on. Find the following:
a) Assume D2 is on. b) The current ID1. c) The current ID2. d) The voltage Vo. e) Verification to prove or disprove your assumptions for
both diodes are correct. 5. Repeat problem 4 assuming D2 is off. 6. Use the correct operation for D1 and D2. If there is noise on the +15V supply that increases it sometimes to as much as +16V and sometimes as low as +14V, what is the MAXIMUM value for Id1 (the DC and AC current through diode, D1). {Hint: remember to use the AC model for the diode}
+2.2V
D1 2k
D2
+2V
1kΩ
-10V
| +
1kΩ
2k
+15V
2V + +
2
7. a) Sketch the Bode (both magnitude & phase) plot for: {label as many y values as possible for both magnitude and phase and/or each slope along with showing all your work}
𝐻 𝑠 = !!!"! !!! !
! ! !""
!!"" !
b) What is the estimated or actual magnitude value at ω= 10,000 rad/sec (in dB): c) At what frequency does this circuit begin to operate? 8. a) Sketch the Bode (both magnitude & phase) plot for: {label as many y values as possible for both magnitude and phase and/or each slope along with showing all your work}
𝐻 𝑠 =
!!!"! !!!"" !
!!!",!!! ! ! !" !!""
!
b) What is the estimated or actual magnitude value at ω= 10,000 rad/sec (in dB): c) At what frequency does this circuit operate? 9. Assume that Vg is the input signal. Find the Thevenin equivalent between terminals a-b.
10. Assume that Vg is the input signal. Find the Thevenin equivalent between terminals a-b.
+ _
5Ω
10Ω
+
_
a
b
2v2
40Ω 20Ω 40Ω
20Ω
5Ω
_ v2
+
2V + +
20Ω
30Ω
+
_
a
b
2v2
40Ω 5Ω 40Ω
20Ω _
v2 +
_ +
