Keyword: «frequency synthesizer»

Analytical dependences of the conditions of stable operation of phase distortion compensation channels of frequency synthesizers included in the reference channel and in the feedback circuit of the pulse-phase frequency auto-tuning ring for on-board communications when using low-pass filters of the first order are obtained, a characteristic equation is obtained when using Butterworth and Chebyshev low-pass filters of the second order.

Analytical expressions have been obtained for analyzing the transient characteristics of frequency synthesizers with phase distortion compensation channels included in the reference channel and in the feedback circuit of the pulse-phase self-tuning ring for on-board radio communications using low-pass filters of the first order and Butterworth and Chebyshev filters of the second order.

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.