Keyword: «frequency modulation»

The needs determining the directions of development of on-board radio communication systems are considered. Architectures of frequency synthesizers with two-point frequency modulation and channels of auto-compensation of interference of a pulse-phase modulator are given.

The transfer functions of functional models of frequency synthesizers (FS) with two-point frequency modulation and distortion compensation channels included in the reference channel, as well as in the feedback circuit of the pulse-phase frequency auto-tuning ring have been developed. Compensation characteristics of FS with distortion compensation channels when using low-pass filters of the 1st and 2nd orders are analyzed.

The features of the construction of frequency synthesizers (FS) for radio transmitting devices of on-board communication complexes, the need to compensate for parasitic frequency and phase modulation when using indirect methods for the formation of frequency-modulated signals are considered. The architectures of FS with devices for auto-compensation of pulse-phase modulator interference in the reference channel of the pulse-phase auto-tuning system (PLL), as well as in the feedback circuit of the PLL ring, are given.