That's a rather superficial description, you hardly get a working FM detector this way. How do you generate the correct carrier frequency? What's the relevance of carrier phase?If we multiply FM signal by carrier frequency and pass it through LPF, We can get the message signal. Similar to coherent detection in AM demodulation. So what's the point of feedback?
In practice, the feedback loop is required to "fix" the LO frequency and phase-lock it to the carrier.By the way If I can fix the local oscillator frequency equal to carrier frequency, I can still recover message signal. Why then closed loop feedback is required?
but that´s the key point.I assign VCO free running frequency equal to carrier frequency
Hi KlausST
The purpose of feedback is clear. But should I set the free running frequency and sensitivity of VCO same as the transmitted signal. This means I should be aware of the signal characterstics recieved. Is it true? I wonder how would single PLL behave,when when we have multi tone signals?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?
We use cookies and similar technologies for the following purposes:
Do you accept cookies and these technologies?