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阐述了一个S波段锁相式频率合成器,频率范围为2.4~2.5 GHz,频率步进为4 MHz,相位噪声指标为￡(100 kHz)<-110 dBc/Hz.该频率合成器通过51系列的单片机采用I2C总线对锁相环路一系列参数进行控制,通过软件编程来实现对VCO反馈信号的分频,代替传统的PC控制,使应用更方便.该电路的主要特点是体积小、频率调整方便.
An S-band PLL synthesizer with a frequency range of 2.4-2.5 GHz, a frequency step of 4 MHz and a phase noise index of <-110 dBc / Hz is presented. The frequency synthesizer passes the 51 series The microcontroller uses I2C bus to control a series of parameters of the phase-locked loop, and the frequency division of the VCO feedback signal can be achieved through software programming to replace the traditional PC control, making the application more convenient.The main features of this circuit are small size, Easy to adjust.