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# Electronics And Communication Engineering Homework Help

## Popular Subjects for Electronics and Communication Engineering Homework Help

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### Recently Asked Electronics and Communication Engineering Questions

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• Q1: For 27th when it is 10:30 AM LT (Clock time),answer the following questions. 1. What is the geographical position (coordinates) of KC? (Points 3) 2. What is the difference of the Local Time (LT) from Greenwich Mean Time (GMT) in hours for KC? 3. Calculate LSTM for KC. 4. Calculate Equation of Time (EoT). 5. Calculate time correction factor. 6. Calculate local solar time. 7. Calculate hour angle for this time.See Answer
• Q2: Q 1: The parameters of the circuit in Figure 1are R, =RL = 10k2, C2 =15mA/V. Use s-domain analysis to find5002, C1 = 20µF, R;10pF, and1kQ,Em =the low 3-dB frequency fL, the high 3-dBfrequency fH , and the midband gainAp(mid)APB. (25 Points) See Answer
• Q3: Q 2: Design a common-source NMOSamplifier as shown in Figure 2 to give apassband gain of 20 < |A PB| < 30,Zin(mid) 2 100kQ, a low 3-dB frequency offL < 10k H z, and a high 3-dB frequency offH = 200k H z. (25 Points)See Answer
• Q4: Figure 1 is a dimensioned plot of the steady state carrier concentrations inside a pn stepjunction diode maintained at room temperature. Is the diode in forward or reverse bias? Explain your answer. Does low level injection prevail? Explain your answer. What are the p- and n-side doping concentrations? Determine the applied voltage, VA. Determine the built-in potential, Vbi- If we know this diode is made of silicon, determine the width of the depletionregion, W.nor p See Answer
• Q5: Amplitude modulation (broadcast AM) is used to modulate signal to transmit message m1(t), with a modulation indexu=0.75, based upon a carrier with frequency 100 kHz. a. What amplitude of the carrier is added to get this µ? b. Write an expression for 02(t)=DAM(t) – you can leave it in terms of m1(t) c. Find the bandwidth, BT2 , of this modulated signal - 32000 Hz d. Estimate the power efficiency of this signal - the ratio of the sideband power to the total power of the modulatedsignal. (Hint: Intelligent guesstimations will work on this or you can do more work) e. Can an envelope detector be used to demodulate? If no, what needs to change? If yes, name a good RC value thatwould work.See Answer
• Q6: This message signal will be referred to as m1(t) in most of the remaining problemson this test: m_{1}(t)=\cos ^{2}\left(2 \pi 8000 t+\frac{\pi}{8}\right) Find B1, the bandwidth of m1(t). Find P1, the power of the m1(t). . Find m(t), the derivative of m1(t). - Find mp1, the peak value of m1(t). e. Find m,, the peak value of the derivative of m1(t).'p'See Answer
• Q7: Consider the simplified linear de machine we discussed in class. The machine has the following characteristics: B = 0.5 T into page R = 0.2 N l = 0.6 m VR = 110 V Calculate the starting current of the machine, and the machine's velocity at no load. While the external force on the bar remains the same as part (b), suppose the bar runs off into a region in which the flux density is 1.3 T. Calculate the new current and determine its direction. What would be the new induced voltage in the bar?What would be the final steady state speed of the bar? ) Now assume the battery voltage is increased to Vg=130 V while everything else remaining as in part (c). What is the new current, induced voltage, and final steady-state speed of the bar? ) Suppose that an external force of Fapp = 25 N is applied to the bar in the same direction of the bar's motion. Is the machine working as a motor or a generator?Find the new current and determine its direction. What would be the new induced voltage in the bar? What would be the final steady state speed of the bar? How much mechanical power would the bar be producing or consuming? How much electrical power would the bar be producing or consuming? How much electrical power would the battery be producing or consuming?See Answer
• Q8: Design a system that will detect the sequence 110 anytime it occurs in an input wire x.See Answer
• Q9: Design a BCD counter. The circuit counts from 0 to 9, then resets back to 0 to restart the counting sequence. The circuit has one input run/stop. If the input is 1, the counter will count. If the input is0, the counter will freeze in its current location until the input is set to 1 again. III IUSI agal• The circuit has one output. It becomes 1 when the counter completes a cycle and starts the next one. Otherwise, that output is 0.See Answer
• Q10: Design a counter with the following sequence: 0, 1, 2 ,4, 6. Use JK Flip-Flop.See Answer
• Q11: Compare and contrast your results for a P and a Pl controller. Discuss the trade-offs between controller complexity and performance. Discuss the effect of the integrator on steady state error.See Answer
• Q12: 4. ADS Simulate using Smith Chart showing S11 and S22 parameters between 750 MHz and 1.25 GHz. Place a marker at 1 GHz. Use the S2P component part and use theMRF911D.S2P file copied to the Desktop. The MRF911D.S2P file is found in the Amplifier section of you Blackboard page. Follow the example in the Amplifier section to give the S parameters in table format, find using the ADS EQUATION the stability factor K, and G max as shown in the example provided in the Amplifier section of your Blackboard page.See Answer
• Q13: Design a sequential circuit with two D flip-flops A and B, and one input x_in. When x_in = 1, the circuit goes through the state transitions from 00 to 01, to 11, to 10,back to 00, and repeats. When x_in = 0, the circuit goes through the same sequence above, but backwards. The value of x_in can change at any point in time. Therefore, the circuit may reversedirection at any point and follow the sequence in the other direction from that point.See Answer
• Q14: Q 1: The parameters of the circuit in Figure 1are Rs = 5002, C1RL20µF, R¡ = 1k2,10pF, and10k2, C2 =gm = 15mA/V. Use s-domain analysis to findthe low 3-dB frequency fL, the high 3-dBfrequency fH , and the midband gainAv(mid)APB. (25 Points)See Answer
• Q15: Q 2: Design a common-source NMO Samplifier as shown in Figure 2 to give a pass band gain of 20 < |A PB| < 30,Z n(mid) 2 100kohms , a low 3-dB frequency of fL < 10kH z, and a high 3-dB frequency of 200k H z. (25 Points)f Ipss = 12.5mA, ID = 1mA, and Vp = -3.5V ro » Rd ||RL , RL » Rd and RG very large . Rd = 10 k ohms gm = 4.98 * 10-3 R2=500kohms , RL=100kohms , R,5 =5 kohms R2=500kohms , RL 100kohms , R5=5kohms fL = 9.9kHz, fc2 = fL/10 C1 =8n F Rc1 = Rf1 = 110kohms See Answer
• Q16: 4. Write C statements that set B to the reverse complement of A, such at B7 = ~A0, B6 = ~A1,etc.See Answer
• Q18:• Phase 2: Add original/noisy data and display to the minimal system. When the user of the PC application initiates an action, a string of 128 characters is sent to the microprocessor. The microprocessor passes the data and an 8-bit unsigned THRESHOLD (related to a noise level) to t FPGA. The microprocessor receives the noisy data sent back from the FPGA only after a push bu on the FPGA board is pushed, and sends the noisy data to the PC for display.See Answer

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