24 Threads found on edaboard.com: Fm Demodulation Pll
Hi guys can you please help me i am simulating an fm system here is the code below I am having a problem on the demodulation side I am trying to demodulate using pll desgning (Phase Lock Loop). But it is giving me an error at last line R has to be positive number I think its R please help I am giving up
Digital Signal Processing :: 02.12.2005 22:36 :: locchamp :: Replies: 4 :: Views: 13378
You are right ... FM modulation is an analog process.The demodulation can be done in both analog domain and digital domain. The received signal is in analog form. We have two options here.
1) Get the analog received signal and process it using analog electronics to demodulate it.
2) Get the analog received signal and convert it into digital doma
Digital communication :: 17.06.2010 22:41 :: mathuranathan :: Replies: 2 :: Views: 2525
Can someone explain or point me to the right link on how a pll is used to demodulate a FM carrier? Every book I read tells me it can be done but not specific enough on how it is done. I have read Horowitz & Hill: The Art of Electronics 2nd edition and RF Engineering for Wireless Networks by Daniel M. Dobkins.
RF, Microwave, Antennas and Optics :: 05.09.2008 16:52 :: robismyname :: Replies: 14 :: Views: 17640
For FM demodulation: If modulation index is low (max. phase deviation less than 1 radian), you could use a narrow-band pll as a phase demodulator. The output is the ouput of the phase detector, that after derivation gives the frequency.
This can work for low-index FM but not for FSK.
Why do you need a method other than take the control voltage o
Analog IC Design and Layout :: 22.02.2010 11:36 :: zorro :: Replies: 1 :: Views: 1118
I have a project on designing FM receiver 88-108MHz
Basically it will be a superheterodyne receiver (with quadrature mixer) and i need to digitized the IF signal (I & Q) to pass onto the DSP (where i will perform demodulation, digital filtering, etc). And finally connect to the PC via USB.
My question is:
1. What is the recommende
Hobby Circuits and Small Projects Problems :: 27.10.2010 11:49 :: dennis.gmj :: Replies: 4 :: Views: 3157
the pll is a phase locked loop , it has many application and many configrations , it may used in demodulation of FM and FSK or it can be used in clock and data recovery circuits
it consists of 1) phase detector
2) loop filter
and may contain a divider
the frequency Synthesizer is a ci
RF, Microwave, Antennas and Optics :: 18.03.2004 10:18 :: khouly :: Replies: 2 :: Views: 1164
pll is used for demodulaion (mostly in FM and PM systems).
Electronic Elementary Questions :: 28.05.2008 03:33 :: neils_arm_strong :: Replies: 5 :: Views: 1604
I am making a modulation FM in to digital signal of 5v and 200kHz.
- When the level is of 5v the modulated signal is of 10'58 MHz
- When the level is of 0v the modulated signal is of 10'81 MHz
I have tested with demodulador TBA120, and works correctly, but this component works until speeds of 56KHz. Somebody can indicate to me I can demodul
Analog Circuit Design :: 13.07.2005 03:51 :: kkdelabaca :: Replies: 4 :: Views: 1608
Just found some schematics * by t
Analog Circuit Design :: 31.07.2005 13:15 :: papyaki :: Replies: 1 :: Views: 5634
RF, Microwave, Antennas and Optics :: 05.12.2005 16:43 :: are :: Replies: 2 :: Views: 618
out of existing different methods to detect FM like Foster seely,ratio detector,slope detector.. pll based methods assumes more importance becoz it is more chraracterized by high linearity....
RF, Microwave, Antennas and Optics :: 13.01.2006 04:15 :: electronics_kumar :: Replies: 7 :: Views: 1438
in practical systems the if = 10.7 MHZ or 455K
10.7MHz for FM and 455K for NBFM or AM , it can be also 70KHz
RF, Microwave, Antennas and Optics :: 28.04.2006 08:00 :: ahmad_abdulghany :: Replies: 5 :: Views: 836
the pll has many application
about ur question u have a VCO with 2 GHz , and the phase detector to detect the phse difference between thr VCO and Xtal oscillaot "there is no Xtal oscillator running in 2 GHz"
but between the VCO and phase detector we usually insert a frequncy divider
and this called Frequncy synthizer
there are alot of
Analog Circuit Design :: 01.04.2006 04:27 :: khouly :: Replies: 4 :: Views: 2868
Do you have any idea about this title?
An FM Modulator/Demodulator using fpga
The modulation may be fsk or Xpsk!
PLD, SPLD, GAL, CPLD, FPGA Design :: 05.03.2007 16:14 :: eelinker :: Replies: 4 :: Views: 5530
what is 455khz QUAD COIL in FM receiver design with ICs like as MC13135?
Do you have any datasheet link from TOKO or others?
RF, Microwave, Antennas and Optics :: 09.05.2007 13:28 :: 7rots51 :: Replies: 4 :: Views: 3275
We using FM pll demodulator with a data slicer as FSK demodulator, my question is what is it a coherent demodulator or non-coherent demodulator?
And FSK demodulator has two another method:
1: general band pass filter and envelope comparator
2: match filter BPF and envelope comparator
What 's 1 and 2 coherent demodualtor or non-coherent dem
Digital communication :: 24.06.2007 23:16 :: wwfhm2002 :: Replies: 2 :: Views: 1742
u can use communication tab in simulink and FM.
MATLAB HELP is the best ref for MATLAB use.
Electronic Elementary Questions :: 20.10.2007 10:24 :: Ali.Samari :: Replies: 1 :: Views: 3548
hi to all,
i have to implement delay lock loop in matlab/simulink for fm demodulation.if you people can please guide me from where to start.
i ll really apreciate your help
RF, Microwave, Antennas and Optics :: 30.10.2007 06:41 :: nidahas :: Replies: 7 :: Views: 2006
I guess it might be a reason AM and FM demodulation were (are) easier to handle: AM can easily demodulated with an envelope detector, FM with the help of a pll
Electronic Elementary Questions :: 11.05.2009 12:27 :: arefeidi :: Replies: 3 :: Views: 934
In my opinion, the correct topic is FM-demodulation rather than spectral analysis. The problem can't be solved however without considering the characteristics of the baseband signal. As another point, the demodulator should be almost invariant to a varying carrier level. The most promising FM-demodulation methods are based on a pll tracking (...)
Digital Signal Processing :: 02.09.2009 06:07 :: FvM :: Replies: 4 :: Views: 801
I have to design a phase demodulator at 10.7 MHz. The modulation index is 1.1 radian and the bandwidth of the information signal is 8 kHz.
I am trying to use a technique used in FM demodulation which is to first convert the FM signal to AM signal and then using the diode detector. MY question is would this work for PM demodual
RF, Microwave, Antennas and Optics :: 09.05.2010 23:55 :: fahsa :: Replies: 3 :: Views: 954
Hello everyone!!! I have a problem. I would like to perform phase demodulation using pll. I have some matlab code that do that in the case of FM. Here is the code:
%This m-file demonstrates a pll which tracks and demodulates an FM carrier.
N=5000;%Number of (...)
RF, Microwave, Antennas and Optics :: 02.11.2011 07:11 :: FFFPLL :: Replies: 0 :: Views: 639
I am not very familiar with video standards. I need to know if I can demodulate an FM modulated video signal with TDA9886. On the datasheet of TDA9886, it claims that it is a demodulator for FM TV. However, the block diagram given in the datasheet looks more like an AM demodulator for video and FM demodulator for sound. I attached
Electronic Elementary Questions :: 12.06.2012 07:37 :: 0dBc :: Replies: 3 :: Views: 645
The pll can be used to multiple up the clock input to make your device run faster – of course this also means it uses more power.
A phase-locked loop (pll) is a closed-loop frequency-control system based on the phase difference between the input clock signal and the feedback clock signal of a controlled oscillator.
Electronic Elementary Questions :: 25.07.2013 04:47 :: Jinzpaul4u :: Replies: 1 :: Views: 168