1. FOR MORE CLASSES VISIT www.ecet310assist.com

2.  ECET 310 Week 1 Homework 1_1  ECET 310 Week 1 Homework 1_2  ECET 310 Week 2 Assignment Homework 2_1  ECET 310 Week 2 Assignment Homework 2_3  ECET 310 Week 3 Assignment Homework 3_1  ECET 310 Week 3 Assignment Homework 3_2  ECET 310 Week 5 Assignment Homework 5_1  ECET 310 Week 7 Homework 7_1

3.  ECET 310 Week 1 Homework 1_1  Computer Science - General Computer Science  1. Add:  (a) 60 dB + 25 dB=  (b) 20 dBW + 5 dBW=  (c) 22 dB - 4 dB=  2. Convert:  (a) 65 W into dB =  (b) 10 dB into watts  (c) – 5 dB into watts=.  (d) –30 dBm into dBrn =  (e) 15 dBrn into dBm =  2. A three-stage amplifier is shown with power gains. Calculate total power :

4.  ECET 310 Week 1 Homework 1_2  Computer Science - General Computer Science  1. Four frequencies are applied at the input of a non- linear amplifier. Write down all of the frequency components at the output of the non-linear device. Write down only the first three harmonics.  2. Find out the frequency components at the output of a resonant-tuned circuit tuned at 1200 KHz with a bandwidth of 15 KHz and connected at the output of a non-linear amplifier (mixer).

5.  ECET 310 Week 2 Assignment Homework 2_1  Computer Science - General Computer Science  1. Assume that a receiver has a first amplifier stage with a 5KW input resistance, a gain of 300, an input audio signal of 20 mV, and an operating temperature of 27oC. When the amplifier is operating with a bandwidth first of 10 MHz, find  (a) therms input noise levels  (b) the audio output levels

6.  1. fCUTOFF = 130 KHz  T = 25  Sec   Draw the frequency spectrum of the output of the low pass filter.  2. Draw the frequency spectrum of the output if the filter is: 14 marks   A high pass filter fC = 20 KHz

7.  ECET 310 Week 2 Assignment Homework 2_3  Computer Science - General Computer Science  1. The bandwidth of a series resonant circuit is 400 Hz.  (a) If the resonant frequency is 4000 Hz, find Q.  (b) If Ω, what is the value of XL at resonance?  Find the inductance L and capacitance C of the circuit.=   2. The frequency response curve for an RLC circuit is shown in the diagram.  (a) Determine Q and bandwidth for the frequency response curve shown.  (b) For μF, determine L and R for the resonant circuit.

8.  ECET 310 Week 3 Assignment Homework 3_1  Computer Science - General Computer Science  1. An AM signal has an unmodulated carrier voltage VC = 10VP, a load resistance of RL = 10, and a modulation index of m = 1. Determine:  Modulation  (a) PC = Vc2/2/2(10)=  PSB =PT-PC/2=  (b) Total power in the AM signal  2. Find the modulation index corresponding to the given trapezoidal pattern for the AM signal.  3. You are tuned to an AM station at 1200 KHz. Write down the frequency components of the received AM signal.  4. Draw an AM signal for the given conditions:

9.  ECET 310 Week 3 Assignment Homework 3_2  Computer Science - General Computer Science  1. Draw the frequency spectrum at the output of the first balanced modulator.  2. If the filter is a low pass filter, draw the frequency spectrum at the output of the filter and amplifier  3. Draw the frequency spectrum at the output of the second balanced modulator.  4. If the filter is a low pass filter, draw the frequency spectrum at the output of the filter and linear power amplifier.  5. Find the value for the required Q for the first filter.  6. Find the value for the required Q for the second filter.

10.  1. Define FM.  2. What parameter of the intelligence signal causes frequency deviation of the carrier?  3. What parameter of the intelligence signal causes or determines the rate of carrier frequency deviation?  4. Define modulation index for FM.  5. What is the reason that FM requires wider bandwidth as compared to AM?  6. What characteristics of FM signal are shown by Bessel Function Solution of FM signal?  7. If you are tuned to an FM station at a frequency of 100.1 MHz, show the bandwidth allocation for two adjacent stations.

11.  ECET 310 Week 5 Assignment Homework 5_1  Computer Science - General Computer Science  1. Determine the Nyquist sample rate for a maximum analog input frequency of:  (a) 4 KHz  10 KHz  2. Determine the dynamic range for a 10-bit sign- magnitude PCM code.  3. Determine the minimum number of bits required in a PCM code for a dynamic range of 80 dB. What is the coding efficiency?  4. For a resolution of 0.04 V, determine the voltages for the following linear seven- bit sign magnitude PCM codes

12.  1. For a 64-PSK modulator with an input data rate(fb) equal to 36 Mbps and a carrier frequency of 100 MHz, determine the minimum double-sided Nyquist bandwidth(fN) and the baud. Sketch the output spectrum.  2. Determine the bandwidth efficiency for the following modulators:  (a) QPSK =  (b) 64-QPSK =  (c) 128-QAM=  3. A radio channel has a bandwidth of 10 KHz and a SNR of 15 dB. What is the maximum data rate that can be transmitted:  (a) Using any system?  (b) Using a code with 64 possible states?  4. A modulator transmits symbols, each of which has 64 different possible states, 15,000 times per second. Calculate the baud rate and the bit rate.

13.  ECET 310 Week 7 Homework 7_1  Computer Science - General Computer Science  1. For a QPSK system and the given parameters, determine  2. Which system requires the highest Eb/No ratio for a probability of error of 10-7, four-level QAM or 8-PSK system?  3. Determine the minimum bandwidth required to achieve a P(e) of 10-4 for a 16-PSK system operating at 25 Mbps with a carrier-to-noise ratio of 10 dB  4. A PCM-TDM system multiplexes 32 voice channels each with a bandwidth of 0 Khz to 4 KHz. Each sample is encoded with an 8-bit PCM code. UPNRZ encoding is used. Determine:

14. FOR MORE CLASSES VISIT www.ecet310assist.com