PLL of active phased array radar

Abstract

The invention discloses a PLL of an active phased array radar. The PLL comprises a phase discriminator, a voltage-controlled oscillator, an LNA, a frequency divider 1 / N and a fourth-order band-pass filter. A frequency signal to be subjected to frequency multiplication is input into an input end INPUT1 of the phase discriminator, an input end INPUT2 of the phase discriminator is connected with an output end OUTPUT3 of the four-order band-pass filter, and an output end OUTPUT1 of the phase discriminator is connected with an input end INPUT3 of the voltage-controlled oscillator. The output end OUTPUT2 of the voltage-controlled oscillator is connected with the input end INPUT5 of the LNA; the output end OUTPUT4 of the LNA is connected with the input end of the frequency divider 1 / N; the outputend of the frequency divider 1 / N is connected with the input end INPUT4 of the fourth-order band-pass filter. The problems that in the prior art, phase locking of a phase-locked loop is inaccurate, and the phase-locked loop is prone to being impressed by environmental noise are solved.

Description

technical field [0001] The invention relates to the technical field of phased radar, in particular to a PLL of an active phased array radar. Background technique [0002] The continuous development of integrated circuit technology and the advancement of technology have put forward higher requirements for frequency synthesizers. Frequency synthesizers are the key circuits of modern electronic systems and determine the performance of electronic systems. Frequency synthesis can use four different methods: direct frequency synthesis, phase-locked loop frequency synthesis, direct digital frequency synthesis and hybrid frequency synthesis. The purpose is to generate signals, but only phase-locked loops can generate radio frequency signals. [0003] Phase-locked loops are widely used in communications and radar, including: phase detectors, low-pass filters, voltage-controlled oscillators, frequency dividers and other modules, but in the prior art, phase-locked loops are inaccurate ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned deficiencies in the prior art, the PLL of an active phased array radar provided by the present invention solves the problems in the prior art that the phase locking of the phase-locked loop is inaccurate and easily affected by environmental noise impressions

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