公开(公告)号：US20230092014A1

公开(公告)日：2023-03-23

申请号：US17816866

申请日：2022-08-02

申请人： Zhejiang University

发明人： Xinglin Sun ,  Haojie Wu ,  Xinyue Tan ,  Lingyun Ye

IPC分类号： G01R23/10

摘要： A phase frequency detector-based high-precision feedback frequency measurement apparatus and method: a Field Programmable Gate Array (FGPA) roughly measures a frequency fx of a measured time-frequency pulse by an equal-precision frequency measurement method; a Direct Digital Synthesizer (DDS) automatically synthesizes a frequency fx’ according to the fx roughly measured by the FPGA; the fx and the fx’ are sent to a phase frequency detector for performing phase frequency detection and then sent to the FPGA after passing through a charge pump, a low-pass filter circuit, and an (Analogue-to-Digital) A/D converter; the FPGA processes a frequency difference obtained by the phase frequency detector and then transmits the processed frequency difference to the DDS to form a negative feedback frequency measurement system so that the DDS continuously adjusts the fx’ according to a frequency difference measurement result until the output of the DDS is stable. Therefore, precise measurement of the time-frequency pulse to be measured is realized.

公开(公告)号：US11965919B2

公开(公告)日：2024-04-23

申请号：US17816866

申请日：2022-08-02

申请人： Zhejiang University

发明人： Xinglin Sun ,  Haojie Wu ,  Xinyue Tan ,  Lingyun Ye

IPC分类号： G01R23/10

CPC分类号： G01R23/10

摘要： A phase frequency detector-based high-precision feedback frequency measurement apparatus and method: a Field Programmable Gate Array (FGPA) roughly measures a frequency fx of a measured time-frequency pulse by an equal-precision frequency measurement method; a Direct Digital Synthesizer (DDS) automatically synthesizes a frequency fx′ according to the fx roughly measured by the FPGA; the fx and the fx′ are sent to a phase frequency detector for performing phase frequency detection and then sent to the FPGA after passing through a charge pump, a low-pass filter circuit, and an (Analogue-to-Digital) A/D converter; the FPGA processes a frequency difference obtained by the phase frequency detector and then transmits the processed frequency difference to the DDS to form a negative feedback frequency measurement system so that the DDS continuously adjusts the fx′ according to a frequency difference measurement result until the output of the DDS is stable. Therefore, precise measurement of the time-frequency pulse to be measured is realized.