FM demodulators with local oscillator frequency control circuits

Details FM demodulators with local oscillator frequency control circuits FM demodulators with local oscillator frequency control circuits

1984-04-04

1986-04-01

Grimm, Siegfried H.

Demodulators

Amplitude modulation demodulator

Having specific distortion, noise or other interference...

329124, 375 81, 375120, 455214, 455260, H03D 302

Patent

active

045801010

ABSTRACT:
An FM demodulator includes frequency conversion means (20) to derive from an FM input signal (10) a pair of like signals that are mutually phase-displaced by 90.degree.. Such signals are filtered (26,28), squared (30,32) and sampled (38). The output signal (40) of the sampling means (38) is used to control (62) the local oscillator (16) of the frequency conversion means (20). In one arrangement, the magnitude of the control applied to the oscillator (16) is dependent on the frequency of one of the squared (30) signals, whereas the direction is dependent on the logic state of the output signal (40). A similar control method can be applied to a superheterodyne receiver.

REFERENCES:
patent: 3600700 (1971-08-01), Matsuo
patent: 4344178 (1982-08-01), Waters
patent: 4367558 (1983-01-01), Gercekci et al.

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