Method for reducing frequency traction of two-way phase-locked loop of integrated radio frequency system

Abstract

The invention discloses a method for reducing frequency traction of a two-way phase-locked loop of an integrated radio frequency system, and aims at providing a method which is small in loss of inputsignals, can inhibit interference signals and weakens frequency traction. According to the technical scheme, in the integrated radio frequency system, a phase locking module is divided into a PLL1 phase locking loop and a PLL2 phase locking loop, two frequencies F1 and F2 with the same frequency are locked, and the two frequencies are locked in the same reference source 10MHz temperature compensation crystal oscillator (TCXO) respectively; the input and the output of the selected amplifier are led out from two completely opposite directions by the phase-locked loop; the phase-locked loop continuously compares the frequency division of two frequency homologous output frequencies with the phase difference of 10MHz temperature compensation crystal oscillator TCXO output frequencies of an output amplification circuit of the reference source; the phase difference is converted into direct-current voltage through the low-pass filter, the voltage-controlled oscillator is driven, the crystal oscillator is locked quickly, and the frequency accuracy and the long-term stability of the crystal oscillator change along with a standard frequency source.

Description

technical field [0001] The invention relates to a radio frequency integrated system that can be widely used in measurement, radar, communication, navigation, etc., and is mainly used in the design method of a dual-channel phase-locked loop that reduces the frequency of the local oscillator. Its purpose is to improve the stability of complex electronic equipment functions , improve the spectrum quality and frequency accuracy of each electronic equipment functional module in the radio frequency integrated system, and ensure the accuracy of information transmission and acquisition. Background technique [0002] In the prior art, many electronic devices usually need to synchronize an external input signal with an internal oscillating signal, and this purpose can be achieved by using a phase-locked loop. A phase-locked loop is composed of three basic components: a phase detector (PD), a loop filter (LF) and a voltage-controlled oscillator (VCO). It is a phase error control syste...

AI Technical Summary

Problems solved by technology

Due to the frequency correlation between the functional modules of the transceiver components, this effect spreads to the entire device, resulting in functional degradation or functional failure

[0004] With the rapid development of wireless navigation and measurement technology, the implementation methods in aerospace measurement and control and navigation, communication, radar and other fields have been continuously enriched and improved. While improving the reliability of measurement and control, it has also brought about an increase in the number of radio frequency equipment and electromagnetic interference between equipment. Difficulties such as complex environment, large system size, heavy workload of test operation and maintenance, and large personnel requirements

The integrated radio frequency terminal is a complex electronic system. There are many kinds of signals in the system, and the electromagnetic environment is complex. The processing channels of the system have high requirements for the suppression of stray and interference signals. Regardless of the integrated channel chip solution or the traditional independent element Device implementation schemes all need to solve the problem that the integrated radio frequency system is affected by the coupling of the external electromagnetic environment. The main contradiction lies in minimizing the frequency traction inside the machine

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