Monostable flip=flop demodulator for FM signals - inverts FM input signal, reshaped in limiter, in NOT=gate

摘要

The demodulator has a connected low pass for integration of monoflop pulses with the demodulated signal. The reshaped FM input signal from a limiter (1) is inverted in a NOT-gate (2). The inverted signal is supplied directly to an input (4) of an NAND-gate (3), as well as in parallel to a NOT-gate (6) and after a reinverting and subsequent delay in an element (7) with a constant group transit time, to the other input (5) of the NAND-gate. The output signal of the NAND-gate is inverted into monoflop pulses in a connected NOT-gate (8). Pref. the delay element is in a form of a delay line with a terminal resistance (10) of its wave resistance magnitude. The limiter, the logic gates and the delay element are typically discrete components. ADVANTAGE - Reduced natural noise for FM signal demodulation.