# ECET 310 Week 1 Homework 1_1 NEW

ECET 310 Week 1 Homework 1_1 NEW

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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 gain in decibels, and as a number
3. (a)  Determine the overall power gain.
b) Find the output power if   Pin  =  15 mW
4. If Pin  =  -20 dBm, determine the output power in dBm and watts
5. Determine:
Net gain  (b)  Net gain in dBs  (c)  Power output
6. Determine:
(a)   Net gain  (b)  Net gain in dBs  (c)  Power output

# ECET 310 Entire Course NEW

ECET 310 Entire Course NEW

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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

# ECET 310 Week 1 Homework 1_2 NEW

ECET 310 Week 1 Homework 1_2 NEW

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ECET 310 Week 1 Homework 1_2 NEW

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).

# ECET 310 Week 2 Assignment Homework 2_1 NEW

ECET 310 Week 2 Assignment Homework 2_1 NEW

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ECET 310 Week 2 Assignment Homework 2_1 NEW

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

the rms output noise levels

2. We have an amplifier with a 1 MHz bandwidth and a 20 mV input signal. The input mV, output mV, and output mV.

Find

(a) SNR at the input

(b) SNR at the output

Noise figure

3. An FM receiver has at the input and at the output.

Calculate the receiver’s noise figure in dB’s.

4. A 300 W resistor is connected across the 300 W antenna input of a television receiver. The bandwidth of the receiver is 6 MHz, and the resistor is at room temperature (20oC). Find the noise power and noise voltage applied to the receiver input.

5. The signal at the input of an amplifier has an SNR of 42 dB. If the amplifier has a noise figure of 6 db, what is the SNR at the output (in dB’s) ?

6. A three-stage amplifier is shown. The operating bandwidth is 500 KHz at a temperature of 25o C. The output load is 1000W.

7. The noise input power is 1 pW/Hz. Determine the output noise power.

# ECET 310 Week 2 Assignment Homework 2_2 NEW

ECET 310 Week 2 Assignment Homework 2_2 NEW

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ECET 310 Week 2 Assignment Homework 2_2 NEW

ECET310

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

# ECET 310 Week 2 Assignment Homework 2_3 NEW

ECET 310 Week 2 Assignment Homework 2_3 NEW

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ECET 310 Week 2 Assignment Homework 2_3 NEW

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.

Determine the applied voltage.

# ECET 310 Week 3 Assignment Homework 3_1 NEW

ECET 310 Week 3 Assignment Homework 3_1 NEW

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ECET 310 Week 3 Assignment Homework 3_1 NEW

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:

(a)

b) m>1

c)m<1

5. An AM transmitter is transmitting at 1000 W. If the modulation index is 0.9 and antenna impedance is 50 ohms, find:

# ECET 310 Week 3 Assignment Homework 3_2 NEW

ECET 310 Week 3 Assignment Homework 3_2 NEW

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ECET 310 Week 3 Assignment Homework 3_2 NEW

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.

# ECET 310 Week 4 Assignment Homework 4_1 NEW

ECET 310 Week 4 Assignment Homework 4_1 NEW

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ECET 310 Week 4 Assignment Homework 4_1 NEW

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.

8. What is the required BW to transmit an FM signal if the maximum deviation is 60 KHz and intelligence frequency is 15 KHz?

9. Determine the power distribution in carrier and sidebands if the transmitted power is 1,000 W and mf = 1

10. Why is Preemphasis required?

11. What is the RC time constant required for Preemphasis circuits?

12. An FM transmitter delivers to a 75 ohm antenna a signal voltage of

V(t) = 1000 sin ( 109t + 4 sin 104t )

Determine:

13. Why are RF amplifiers necessary in FM receivers?

14. What are the two functions of a Limiter?

15. What is the meaning of the term center frequency in reference to FM

broadcast?

16. What frequency swing is defined as 100 % modulation for an FM broadcast station?

17. Draw a block diagram for a Crossby FM transmitter for a transmitter frequency of 100.1 MHz.

18.

The given diagram shows an FM transmitter.

(a) What is the total multiplication factor?

(b) What is the carrier rest frequency at the antenna?

(c) What is the deviation of the radiated signal?

(d) What is the % of modulation?

(e) What is the modulation index?

(f) How many sideband pairs are in the radiated signal?

(g) What is the bandwidth of the radiated signal?

(h) What is the input power to the final power amplifier?

(i) What is the output power?

(j) How much power is in the carrier?

(k) How much total power is in the sidebands?

(l) If not already at 100 % modulation, what level of input signal would cause 100 % modulation?

# ECET 310 Week 5 Assignment Homework 5_1 NEW

ECET 310 Week 5 Assignment Homework 5_1 NEW

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ECET 310 Week 5 Assignment Homework 5_1 NEW

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

5. Determine the resolution and quantization error for an eight-bit linear sign magnitude PCM code for a maximum decoded voltage of 1.27 V

6. For a 12-bit linear PCM code with a resolution of 0.02 V, determine the voltage range that would be converted to the following PCM codes.

7. A µ-law compression encoder has

ECET 310 Week 6 Assignment Homework 6_1

Computer Science – General Computer Science

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

5. What is the shannon limit for a standard telephone circuit with an SNR of 30 dB   and a bandwidth of 3.3 KHz?

6. What is the maximum data rate possible for a standard telephone circuit with an SNR of 1023 and BW of 3 KHz using 8 bits per symbol?