Abstract A design method of L-band high-stability coherent frequency source is introduced, and its design method and system performance are analyzed in detail with specific examples. Keywords Phase-locked loop Coherent frequency source Phase noise C a u e r ― c h e b y s h e v filter Loop parameter adjustment plays a decisive role, voltage-controlled oscillator 1 Introduction The application of full coherent technology has greatly improved the performance of radar, and radars using coherent systems have been increasingly widely used. As a key component that provides transmitting excitation signals, receiving local oscillator signals and coherent reference signals to coherent radars, the frequency source has become the heart of the radar. The phase noise, output spurious and other technologies of the frequency source will directly affect the performance of the radar system. Therefore, the output spectrum is pure, the phase noise is small, and the phase-locked method is adopted. It is a voltage-to-frequency conversion device, and its oscillation frequency changes linearly with the input control voltage. Figure 1 Basic composition of phase-locked loop The generation of high-stability and high-frequency coherent frequency sources is increasingly favored by designers. 3 High Stability Coherent Frequency Source Design In order to facilitate understanding and mastering, the principle and basic composition of the 1503.81MHz high phase-locked loop is taken as an example to explain. According to the system\'s requirements for the output spectrum of the high-stable frequency source, the phase detector uses the PE3236 chip of Peregrine-Semite Company (for detailed description, please refer to the PE3236 data sheet). Figure 2 shows that the oscillator of the power supply is placed in the phase-locked loop, so that the phase of the oscillator is locked to a high-purity reference signal, and the oscillator circuit principle...
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