Title：Circuit system based on direct demodulation frequency modulated signal of phase -locked loop
Country：China
Patent No.：201821608143.0
Legal Status：Authorized
Inventor：Woogeun Rhee, Yining Zhang, Ranran Zhou, Zhihua Wang
Assignee：Tsinghua University
Address：Tsinghua University,Haidian District Beijing 100084, China
Filing Date：2018-09-29
Issue Date：2019-02-26
Abstract：
The utility model provides a circuit system based on direct demodulation frequency modulated signal of phase -locked loop, wherein the system includes: amplification and input's radiofrequency signal's enlarged module, mirror looks / mirror is the module frequently, the radiofrequency signal's after obtaining local oscillator and amplifying frequency difference and phase place difference, the bandlimiting module, the module is continuous frequently with mirror looks / mirror for the band limiting module to limit the bandwidth and amplify according to frequency difference and phase place difference, controllable gain enlargies module, the range of adjusting band limiting module output signal through controllable mode, the controllable frequency synthesizer module of frequency is amplifiedthe module with controllable gain and is linked to each other with mirror frequency / mirror phase module, produces corresponding frequency change according to frequency difference behind the gain adjustment and phase place difference signal to carry out frequency adjustment and pursuit. This system has on realizing the basis to conventional frequency shift keying demodulation, can also carry outcarrier frequency pursuit and carrier wave error concealment's advantage to simple structure, the low power dissipation, the performance is strong.
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