GATE Exam > GATE Questions > A super heterodyne receiver having RF amplif...
Start Learning for Free
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio is
- a)76
- b)77
Correct answer is between '76,77'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz,...
a = Image rejection ratio 
[Turned circuit of same quality factor used ar two stages]
Therefore,
Most Upvoted Answer
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz,...
Solution:
Given data:
- Tuned frequency of RF amplifier = 1200 kHz
- Intermediate frequency (IF) = 450 kHz
- Quality factor of tuned circuit at RF amplifier and mixer = Q = 65
We know that the image frequency is given by:
f_image = 2 × f_IF - f_RF
where f_RF is the tuned frequency of the RF amplifier.
Substituting the given values, we get:
f_image = 2 × 450 kHz - 1200 kHz = -300 kHz
The negative sign indicates that the image frequency is below the RF frequency.
The bandwidth of the tuned circuit is given by:
BW = f_RF / Q
At RF amplifier, the bandwidth is:
BW_RF = 1200 kHz / 65 = 18.46 kHz
At mixer, the bandwidth is:
BW_mixer = 450 kHz / 65 = 6.92 kHz
The image rejection ratio (IRR) is given by:
IRR = BW_RF / BW_mixer
Substituting the values, we get:
IRR = 18.46 kHz / 6.92 kHz = 2.67
Multiplying by 20 in decibels, we get:
IRR (dB) = 20 log (IRR) = 20 log (2.67) = 7.6 dB
Therefore, the image rejection ratio is between 76 dB and 77 dB (rounded off to the nearest integer).
Given data:
- Tuned frequency of RF amplifier = 1200 kHz
- Intermediate frequency (IF) = 450 kHz
- Quality factor of tuned circuit at RF amplifier and mixer = Q = 65
We know that the image frequency is given by:
f_image = 2 × f_IF - f_RF
where f_RF is the tuned frequency of the RF amplifier.
Substituting the given values, we get:
f_image = 2 × 450 kHz - 1200 kHz = -300 kHz
The negative sign indicates that the image frequency is below the RF frequency.
The bandwidth of the tuned circuit is given by:
BW = f_RF / Q
At RF amplifier, the bandwidth is:
BW_RF = 1200 kHz / 65 = 18.46 kHz
At mixer, the bandwidth is:
BW_mixer = 450 kHz / 65 = 6.92 kHz
The image rejection ratio (IRR) is given by:
IRR = BW_RF / BW_mixer
Substituting the values, we get:
IRR = 18.46 kHz / 6.92 kHz = 2.67
Multiplying by 20 in decibels, we get:
IRR (dB) = 20 log (IRR) = 20 log (2.67) = 7.6 dB
Therefore, the image rejection ratio is between 76 dB and 77 dB (rounded off to the nearest integer).
|
Explore Courses for GATE exam
|
|
Similar GATE Doubts
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer?
Question Description
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer?.
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer?.
Solutions for A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? in English & in Hindi are available as part of our courses for GATE.
Download more important topics, notes, lectures and mock test series for GATE Exam by signing up for free.
Here you can find the meaning of A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer?, a detailed solution for A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? has been provided alongside types of A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice A super heterodyne receiver having RF amplifier is tuned to 1200 kHz, the intermediate frequency is 450 kHz. The quality factor of the tuned circuit at RF amplifier and at the mixer are same and is equal to 65. The image rejection ratio isa)76b)77Correct answer is between '76,77'. Can you explain this answer? tests, examples and also practice GATE tests.
|
|
Explore Courses for GATE exam
|
|
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup