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21 Threads found on Fm Using Vco
I'm designing -as a hobby project- some IR headphones. When I design anything, I divide the circuit into functional blocks, it allows me to test and debug each independently, before integrating the system. The block I was testing is the classic demodulator circuit using a PLL, and a plain vainilla IC amp, as shown in the image. This schemat
There is a FM modulation coming from somewhere.Looks like it.. It may be supply,tuning voltage,load or something else..
Hi all, I want to implement a simple communication system with digital FM using vco, but Igot confused about using vco for modulation in matlab! Also, after modulation there are limiter and discriminator blocks, is it necessary to use demodulation matlab function in this system? Finally, for this simple system, can I use (...)
Hi everyone I need to design FM MODULATOR BY using PLL but without using any IC or Chip. I need to build the circuit and examine it on the oscilloscope only. thank you in advance for any help..
HI, I am about to finish my 80 MHz Quartz Crystal vco, but I am not confident on Jitter's results. Please try to answer these questions, as fast as you can, as I have the tape-out in August of the full PLL: 1 - For the vco circuits (autonomous circuits), which jitter measurement type should I use: FM or PM (I am using FM)? I think we (...)
hi, i am building a wireless data transmitter as major project in college, basically i am thinking to design a FM transmitter for transmitting serial data (at max 15 meters). i am using lmx2322 pll and vco (80-100 Mhz), can some one tell me if i put serial data(8 bit) at the input of the transmitter then can i get the serial data at the receiver
im designing a phase locked loop as a FM demodulator using 74hc4046. Can anyone explain to me what expected output at the output of phase detector and vco. The output signal that I get from vco is exacly the same as the input signal. but oscilloscope show nothing at the output of the phase detector. can anyone tell what might be the problem.
Hi No one I think the easiest way for implementation of FM modulator is using varactor diods(vco) with a simple oscillator such as colpitts
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.
Hello: I have build a FM radio using STR TEA5757, according Philips Application note AN99041. I have a problem with FM vco alignment. If you align vco coil the tunning voltage should change between 0.8V(88MHz) and 1.9V(108MHz), but in my PCB this isn't happen. If I align my vco coil the tunning voltage is constant in (...)
Hello, When using an IDEAL vco in VerilogA to generate a frequency modulated signal, then the instantaneous frequency of that signal is proportional to the modulating input signal. When using VerilogA to measure the period of the FM signal and thus finding the frequency I can sample these values and export them to Matlab to do an FFT. (...)
Hi, I'm using a 74HC4046A PLL/vco to demodulate mono audio from an FM carrier. The carrier comes from a signal on CAT5e twisted-pair cable. (it rides on the common-mode on one pair which carries video on the differential mode) The carrier frequency is about 250kHz and the amplitude seen by the receiver is about 250mVp-p. Currently I'm modulatin
The maximum frequency of the 74ls124 vco is about 30MHz. So if you need a transmitter in the FM broadcast band, you need a bandpass filter tuned to a vco harmonic. As an RC oscillator, 74ls124 is not very stable and may be very noisy to use as an FM modulator. The control and power voltage should be very well filtered, else the power supply noise
how to modulate a signal (FM) by using a PLL+vco system?
i'd like to ask something. Is this vco very stable??? mean quick stable time from the on time of the power supply and after a long time (eg. 6hours or more) i've playing with FM TX for some years using vco with ordinary HF transistor and it not so stable :|:| considering using pll, but it
u can use the singal to modulate the vco and then u get FM signal , then in reciver u need FM demodulator to extract the signal or u better convert the signal into digital data by DAC , anf then send it using ISM band chip TX , RX , the digital modulation can be FSK , ASK there are many RF chips working in ISM band , check ti , and analog de
Hello everyone I am trying to build an FM transmitter with PLL that can broadcast on 88.0Mhz to 108.0Mhz in 0.1Mhz increment, but I am not sure how to start building it. Some questions that I have; 1) Is there any link or book that I can read about how to design this kind of project, or give out schematic? 2) Do I have to build an FM tran
Look this: And here are schematics of tuner and PLL.
I am using FM,FSK. which group is better?(linear?) Can we use group 1 with PLL ICs?
FSK ... FM ... same principle. An F to V converter would work fine. Another method is to lock onto the modulated signal with a PLL. The loop control voltage becomes your demodulated signal.
Hi I m working on remote controlled car where I requires FM modulator & Demodulator IC. Can anybody suggest IC no's that requires less hardware or a ckt that can be used in remote controlled vehicle.