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    PHASE FREQUENCY DETECTOR-BASED HIGH-PRECISION FEEDBACK FREQUENCY MEASUREMENT APPARATUS AND METHOD
    2.
    发明申请
    PHASE FREQUENCY DETECTOR-BASED HIGH-PRECISION FEEDBACK FREQUENCY MEASUREMENT APPARATUS AND METHOD 有权

    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.

    OSCILLATION DETECTOR AND OPERATING METHOD THEREOF
    3.
    发明申请
    OSCILLATION DETECTOR AND OPERATING METHOD THEREOF 有权

    公开(公告)号：US20230034874A1

    公开(公告)日：2023-02-02

    申请号：US17873795

    申请日：2022-07-26

    申请人： SAMSUNG ELECTRONICS CO., LTD.

    发明人： Jaeseung LEE ,  Sungmin YOO ,  Taehwang KONG ,  Junhyeok YANG

    IPC分类号： G01R23/10

    摘要： An oscillation detector includes an amplitude variation detection circuit configured to generate a first pulse signal by comparing levels of voltages with each other, a frequency variation detection circuit configured to generate a second pulse signal by filtering the first pulse signal and allowing to pass a frequency component that is less than or equal to a certain frequency among frequency components of the first pulse signal, and a time variation detection circuit configured to output an oscillation detection signal when the second pulse signal has consecutive pulses for a period of time.

    FREQUENCY COUNTER CIRCUIT FOR DETECTING TIMING VIOLATIONS
    5.
    发明申请
    FREQUENCY COUNTER CIRCUIT FOR DETECTING TIMING VIOLATIONS 有权

    公开(公告)号：US20210255661A1

    公开(公告)日：2021-08-19

    申请号：US17246259

    申请日：2021-04-30

    申请人： Movellus Circuits Incorporated

    发明人： Jeffrey Fredenburg ,  Xiao Wu

    IPC分类号： G06F1/08 ,  H03K21/02 ,  G06F1/10 ,  G01R23/10

    摘要： A frequency counter circuit includes a first counter path to receive a digitally-controlled oscillator (DCO) clock signal and is configured to generate a first count corresponding to a first frequency of a first reduced clock signal corresponding to the DCO clock signal. A second counting path receives the DCO clock signal and generates a second count corresponding to a second frequency of a second reduced clock signal corresponding to the DCO clock signal. The first reduced clock signal is an integer multiple frequency of the second reduced clock signal. Detection circuitry detects a timing violation associated with the DCO clock signal based on a comparison between at least a portion of the first count and at least a portion of the second count.

    ANOMALY DETECTION APPARATUS, METHOD AND COMPUTER-READABLE MEDIUM
    6.
    发明申请
    ANOMALY DETECTION APPARATUS, METHOD AND COMPUTER-READABLE MEDIUM 有权

    公开(公告)号：US20210247427A1

    公开(公告)日：2021-08-12

    申请号：US17270899

    申请日：2018-08-30

    申请人： NEC Corporation

    发明人： Murtuza PETLADWALA ,  Mitsuru SENDODA ,  Yuko OHTA ,  Ryota SUZUKI

    IPC分类号： G01R23/10 ,  G01R23/14 ,  G01R23/18

    摘要： Provided a method comprising: obtaining waveform data sets of a periodic electric waveform signal, with a length set to one cycle time; calculating a frequency spectrum for each waveform data set; extracting and separating odd and even frequency harmonics to create odd and even frequency harmonic matrices on which a canonical correlation analysis (CCA) being applied to obtain CCA features; performing linear transformation on the CCA features to obtain linear transformed features; generating a model based on the linear transformed features; performing magnitude quantization of frequency spectrums of waveform data sets to identify normal and anomalous waveform signals.

    FREQUENCY SYNTHESIZER OUTPUT CYCLE COUNTER INCLUDING RING ENCODER
    8.
    发明申请
    FREQUENCY SYNTHESIZER OUTPUT CYCLE COUNTER INCLUDING RING ENCODER 审中-公开

    公开(公告)号：US20200041551A1

    公开(公告)日：2020-02-06

    申请号：US16597612

    申请日：2019-10-09

    申请人： TEXAS INSTRUMENTS INCORPORATED

    发明人： Tom Altus ,  Karthik Subburaj ,  Sreekiran Samala ,  Raghu Ganesan

    IPC分类号： G01R23/02 ,  G01R23/10

    摘要： A method of frequency estimation. A clock output from a frequency synthesizer is received at an input of a ring encoder. The ring encoder generates outputs including a ring encoder output clock and an encoded output which represents LSBs of a clock cycle count of the clock output. A binary counter is run using the ring encoder output clock which provides an output count which represents MSBs of the clock cycle count. Using a reference clock, the encoded output is sampled to provide a sampled encoded output and the output count is sampled to provide a sampled output count. Error correcting is applied to the sampled encoded output to provide a corrected sampled encoded output. The corrected sampled encoded output and sampled output count are combined to provide a combined output which is used for estimating an instantaneous or average frequency of the clock output.