General phase-locked loop frequency modulation circuit and frequency modulation method based on chip ADF4110

The invention provides a general phase-locked loop frequency modulation circuit based on a chip ADF4110. The general phase-locked loop frequency modulation circuit comprises a carrier frequency divider, a reference frequency divider, a phase discriminator, a charge pump, a loop filter circuit, a voltage-controlled oscillator and an amplifying circuit, wherein the frequency divider, the phase discriminator and the charge pump use an integrated circuit chip ADF4110; the voltage-controlled oscillator is composed of an MC1648 or an MC12148 and a varactor KV1471; the loop filter uses a second-orderresistor and capacitor low-pass filter circuit structure; and the amplifying circuit is made of OPA2695. 本发明提出了一种基于芯片ADF4110的通用锁相环调频电路，包括：载波分频器、一个参考频率分频器、一个鉴相器、一个电荷泵、一个环路滤波电路、一个压控振荡器和一个放大电路；其中，所述分频器、鉴相器和电荷泵采用集成电路芯片ADF4110；所述压控振荡器由MC1648或MC12148与变容管KV1471构成；所述环路滤波器采用二阶电阻、电容低通滤波电路结构；所述放大电路采用OPA2695。