FM Radio presentation for ECE of PU
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This document provides information about an FM receiver project presented by students. It includes: 1) A block diagram showing the main components of an FM receiver, including the RF amplifier, mixer, IF amplifier, FM demodulator, oscillator, and audio amplifiers. 2) Descriptions of how an FM receiver works by mixing the received RF signal with a local oscillator signal to produce an intermediate frequency, then demodulating the signal to extract the audio. 3) Details about the specific components used in their FM receiver circuit, including transistors, ICs, coils, and the PCB layout. 4) A graph showing the expected signal coverage area for their prototype FM receiver design.
FM Radio presentation for ECE of PU
- 1. FM Receiver PresentationElectronics and Computer Engineering (ECE) Presidency University Quality Education For All To Our
- 2. PRESENTED BY Anamul Karim Md. Khairul Alam Sohanur Rahman Murad Hossain 152 177 041 153 110 041 153 211 041 153 210 041
- 3. Zakir Hossain Sir Assistant Professor Direct Guidance and Supervision by
- 4. CONTENT TABLE • Introduction • How does an FM receiver work • Requirements of a Receiver • RF Mixing • BIG CONCEPT (How FM Work) • Block Diagram of How does an FM receiver work • Main components • Components we use for FM • Graph For area coverage • Circuit Diagram • PCB Design (front and Back) • Complete PCB • Block Diagram • Description • IC TDA1083 (2B) • Input signal • Transmitter amplifier input and output • Future concept design
- 5. “SUCCESSFUL PEOPLE DO WHAT UNSUCCESSFUL PEOPLE ARE NOT WILLING TO DO. DON’T WISH IT WERE EASIER; WISH YOU WERE BETTER”
- 7. How does an FM receiver work? • The audio signal from the output of the microphone is given to the pre- amplifier which boosts the level of the modulating signal. • This signal is then passed to the high pass filter, which acts as a pre- emphasis network to filter out the noise and improve the signal to noise ratio. • This signal is further passed to the FM modulator circuit. • The oscillator circuit generates a high frequency carrier, which is given to the modulator along with the modulating signal. • Several stages of frequency multiplier are used to increase the operating frequency.
- 8. Requirements of a Receiver • It should be cost effective. • It should receive both AM and FM signals. • The receiver should be able to tune and amplify the desired station. • It should have an ability to reject the unwanted stations. • Demodulation has to be done to all the station signals, whatever the carrier frequency is.
- 9. RF Mixing The RF mixing unit develops an Intermediate Frequency (IF) to which any received signal is converted, so as to process the signal effectively.
- 10. BIG CONCEPT How does an FM receiver work? When two signals enter the RF mixer, The first signal frequency = F1 The second signal frequency = F2 Then, the resultant signal frequencies = (F1 + F2) and (F1 - F2)
- 11. The symbol of a RF mixer looks like the following figure. The two signals are mixed to produce a resultant signal, where the effect of one signal, affects the other signal and both produce a different pattern as seen previously.
- 12. Block Diagram of How does an FM receiver work
- 13. Main components Signal Part ONE TWO THREE FOUR Transistor 9018F I.C. 1083 (2B) FM PVC FA-20 Volume 50KD W/Switch I.F.T. 10F (Green) 092 FM osc. Coil Speaker 2” 8ohm I.F.T. 10F (Orange) 093 FM coil 3.5mm jack Ferrite bead 4T (FC-003) I.F.T. 10F (Pink) 094 FM trap coil FM Choke coil Resistors and Capacitors
- 14. Components we use for FM Transistor 9018F IC 1083 ceramic capacitor electrolytic capacitor FM coil PCB Board And many other things
- 15. OUR FM GAIN RATIO The frequency band for FM radio is about 88 to 108 MHz 50% 35% 20% 15% 10% In DHAKA with high antenna In Barishal with high antenna In Khulna with high antenna OTHERS AREA Graph For area coverage
- 16. Circuit Diagram
- 18. When We complete our PCB printing
- 19. mixermixer if amplifieramplifier FM demodulator AF voltage amplifieramplifierRF amplifierRF amplifier AF powerAF power amplifieramplifieroscillatoroscillator Block Diagram
- 20. RF amplifierRF amplifier 1 MixerMixer 2 If amplifieramplifier 3 Modulation 4 FM demodulator 5 oscillatoroscillator 6
- 21. • Most of these blocks are discussed individually, and in more detail, on other pages. • See filters, mixers, frequency changers, am modulation and amplifiers. • The f.m. band covers 88-108 MHz. • There are signals from many radio transmitters in this band inducing signal voltages in the aerial. • The rf amplifier selects and amplifies the desired station from the many. • It is adjustable so that the selection frequency can be altered. • This is called TUNING. • In cheaper receivers the tuning is fixed and the tuning filter is wide enough to pass all signals in the f.m. band. • The selected frequency is applied to the mixer. • The output of an oscillator is also applied to the mixer. • The mixer and oscillator form a FREQUENCY CHANGER circuit. • The output from the mixer is the intermediate frequency (i.f.) • The i.f. is a fixed frequency of 10.7 MHz. • No matter what the frequency of the selected radio station is, the i.f. is always 10.7 MHz. Description
- 22. • The i.f. signal is fed into the i.f. amplifier. • The advantage of the i.f. amplifier is that its frequency and bandwidth are fixed, no matter what the frequency of the incoming signal is. • This makes the design and operation of the amplifier much simpler. • The amplified i.f. signal is fed to the demodulator. • This circuit recovers the audio signal and discards the r.f. carrier. • Some of the audio is fed back to the oscillator as an AUTOMATIC FREQUENCY CONTROL voltage. • This ensures that the oscillator frequency is stable in spite of temperature changes. • The audio signal voltage is increased in amplitude by a voltage amplifier. • The power level is increased sufficiently to drive the loudspeaker by the power amplifier. Description
- 23. _ Large supply voltage range VS=3 ... 12V _ High AM–Sensitivity _ Limiting threshold voltage Vi=50 _V _ Audio output power P0 = 0.7 W _ AFC–connection for VHF–Tuner _ AM–FM switching without high frequency voltages IC TDA1083 (2B) - Features
- 24. IC TDA1083 (2B) - Datasheet
- 25. Input signal (green): from V9 voltage source
- 26. Transmitter amplifier input and output
- 28. Future concept design with more power and less in size… FM Version 2.0