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.

公开(公告)号：US09903892B2

公开(公告)日：2018-02-27

申请号：US14480321

申请日：2014-09-08

申请人： QUALCOMM Incorporated

发明人： Chuang Zhang ,  Nan Chen ,  Junmou Zhang

IPC分类号： G01R19/252 ,  G01R23/10 ,  H03M1/06 ,  H03M1/12 ,  H03M1/60

CPC分类号： G01R19/252 ,  G01R23/10 ,  H03M1/0607 ,  H03M1/1295 ,  H03M1/60

摘要： In one embodiment, a method for measuring current comprises generating a sensor current based on a current being measured. The method also comprises converting a combined current into a first frequency, wherein the combined current is a sum of the sensor current and a common-mode current, and converting the first frequency into a first count value. The method further comprises converting the common-mode current into a second frequency, converting the second frequency into a second count value, and subtracting the second count value from the first count value to obtain a current reading.

公开(公告)号：US20170146578A1

公开(公告)日：2017-05-25

申请号：US15139801

申请日：2016-04-27

申请人： STMICROELECTRONICS SA

发明人： Marc HOUDEBINE ,  Sebastien Dedieu

IPC分类号： G01R23/10

CPC分类号： G01R23/10 ,  G01R23/02 ,  H03D13/001

摘要： A method includes a) counting whole periods of a signal during a first period of a reference signal, b) repeating step a) for each period of the reference signal until a first duration is equal to a first quantity of periods of the reference signal, and c) determining a first average of the whole periods. The method also includes repeating at least one of steps a) to c) and at each repetition shifting a start of the counting of step a) by at least one period of the reference signal, and in steps b) and c) accounting for whole periods of the signal already counted during the at least one preceding group of steps a) and b). The method includes determining a second average of the first averages, and determining the frequency of the signal from the second average and the frequency of the reference signal.

公开(公告)号：US20160187401A1

公开(公告)日：2016-06-30

申请号：US14588014

申请日：2014-12-31

申请人： Texas Instruments Incorporated

发明人： TOM ALTUS ,  KARTHIK SUBBURAJ ,  SREEKIRAN SAMALA ,  RAGHU GANESAN

IPC分类号： G01R23/02

CPC分类号： G01R23/02 ,  G01R23/10 ,  H03L7/091

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.

摘要翻译： 一种频率估计方法。 在环形编码器的输入处接收来自频率合成器的时钟输出。 环形编码器产生包括环形编码器输出时钟和表示时钟输出的时钟周期计数的LSB的编码输出的输出。 使用环形编码器输出时钟运行二进制计数器，该时钟提供表示时钟周期计数的MSB的输出计数。 使用参考时钟，对编码输出进行采样以提供采样的编码输出，并对输出计数进行采样以提供采样的输出计数。 误差校正被应用于采样的编码输出以提供经校正的采样编码输出。 校正的采样编码输出和采样输出计数被组合以提供用于估计时钟输出的瞬时或平均频率的组合输出。

公开(公告)号：US09188612B2

公开(公告)日：2015-11-17

申请号：US14133648

申请日：2013-12-19

申请人： INSTITUTE FOR INFORMATION INDUSTRY

发明人： Tzong-Hsien Ho

IPC分类号： G01R23/02 ,  G01R21/00

CPC分类号： G01R23/02 ,  G01R21/00 ,  G01R23/10

摘要： A frequency measurement device includes a filter, a detecting module and a calculating module. The filter is configured to receive an input signal, and filter the input signal to generate a signal under measurement. The detecting module is configured to detect a plurality of wave peaks or a plurality of wave troughs of the signal under measurement through a second order differentiator, so as to generate a plurality of detecting signals. The detecting signals correspond to the wave peaks or the wave troughs respectively. The calculating module is configured to receive the detecting signals, and calculate a frequency of the signal under measurement according to the detecting signals.

摘要翻译： 频率测量装置包括滤波器，检测模块和计算模块。 滤波器被配置为接收输入信号，并对输入信号进行滤波以产生正在测量的信号。 检测模块被配置为通过二阶微分器来检测被测信号的多个波峰或多个波谷，以产生多个检测信号。 检测信号分别对应于波峰或波谷。 计算模块被配置为接收检测信号，并根据检测信号计算被测信号的频率。

公开(公告)号：US20140354261A1

公开(公告)日：2014-12-04

申请号：US14291609

申请日：2014-05-30

申请人： Fairchild Semiconductor Corporation

发明人： Lei Huang ,  Na Meng

IPC分类号： G01R23/10

CPC分类号： G01R23/10

摘要： A method, circuit, and integrated circuit for detecting resonance frequency is disclosed in which a first operational amplifier circuit receives an input signal and provides an output signal for a resonance circuit to store energy, a zero crossing comparator circuit samples a discharge current of the resonance circuit and transforms the sampled current into a sampled voltage and outputs a square signal to a digital signal processor based on the sampled voltage, and the digital signal processor obtains a resonance frequency based on the square signal.

摘要翻译： 公开了一种用于检测谐振频率的方法，电路和集成电路，其中第一运算放大器电路接收输入信号并提供用于谐振电路的输出信号以存储能量，零交叉比较器电路对谐振的放电电流进行采样 将采样电流转换成采样电压，并根据采样电压向数字信号处理器输出平方信号，数字信号处理器根据平方信号获得谐振频率。

公开(公告)号：US20130315366A1

公开(公告)日：2013-11-28

申请号：US13900774

申请日：2013-05-23

申请人： YOKOGAWA ELECTRIC CORPORATION

发明人： Akihiro OOSHIMA ,  Tomohito NOUNO

IPC分类号： G04F10/00

CPC分类号： G04F10/00 ,  G01R23/10 ,  H03K21/023

摘要： A physical quantity measuring method includes: (a) generating a synchronized input signal from an input signal, wherein the synchronized input signal is synchronized with a reference clock; (b) measuring a total number (Nsum) that is the sum of pulses of the reference clock included in each of n units of the synchronized input signal; (c) generating 2n deviation signals based on a delay of the synchronized input signal with respect to the input signal; (d) generating a deviation integration signal by subtracting the total values of n rear-half deviation signals from the total values of n front-half deviation signals; (e) converting the deviation integration signal into a number of pulses of the reference clock; and (f) calculating the average number (Nrave) of pulses of the reference clock included in one unit of the input signal, based on the total number (Nsum), the number (dNsum), and the number n.

摘要翻译： 物理量测量方法包括：（a）从输入信号产生同步的输入信号，其中所述同步输入信号与参考时钟同步; （b）测量作为同步输入信号的n个单元中的每一个中包括的参考时钟的脉冲之和的总数（Nsum）; （c）基于相对于输入信号的同步输入信号的延迟产生2n个偏差信号; （d）通过从n个前半个偏差信号的总值中减去n个后半偏差信号的总和来产生偏差积分信号; （e）将偏差积分信号转换成参考时钟的脉冲数; 以及（f）基于总数（Nsum），数量（dNsum）和数量n来计算包括在输入信号的一个单位中的参考时钟的脉冲的平均数（Nrave）。

公开(公告)号：US20100295536A1

公开(公告)日：2010-11-25

申请号：US12783900

申请日：2010-05-20

申请人： Masayoshi TODOROKIHARA

发明人： Masayoshi TODOROKIHARA

IPC分类号： G01R23/02

CPC分类号： G01R23/10

摘要： A frequency measuring apparatus includes: a counter section adapted to count a signal including a pulse signal for a predetermined time period, and output a binary count value corresponding to a frequency of the signal including the pulse signal; and a low pass filter section adapted to perform a filtering process on the count value, wherein the low pass filter section includes a first stage filter and a second stage filter, the first stage filter is a moving average filter to which the count value is input, and which provides a binary output with a high-frequency component reduced, and the second stage filter performs an average value calculation on the binary output to provide an output with the high-frequency component reduced.

摘要翻译： 一种频率测量装置，包括：计数器部，适于对包含脉冲信号的信号进行计数，并输出与包括所述脉冲信号的信号的频率对应的二进制计数值; 以及适于对所述计数值执行滤波处理的低通滤波器部分，其中所述低通滤波器部分包括第一级滤波器和第二级滤波器，所述第一级滤波器是输入所述计数值的移动平均滤波器 并且其提供具有降低的高频分量的二进制输出，并且第二级滤波器对二进制输出执行平均值计算，以提供具有降低的高频分量的输出。

公开(公告)号：US20100295535A1

公开(公告)日：2010-11-25

申请号：US12782382

申请日：2010-05-18

申请人： Masayoshi TODOROKIHARA

发明人： Masayoshi TODOROKIHARA

IPC分类号： G01R23/02

CPC分类号： G01R23/10

摘要： A frequency measurement device for measuring a frequency of a signal to be measured including a pulse signal, includes: a signal multiplier section that multiplies the signal to be measured by n is an integer) and outputs a multiplied signal; a counter section that counts the multiplied signal with a predetermined gate time and outputs a count value of the frequency of the signal to be measured at a predetermined period; and a low-pass filter that outputs a signal corresponding to the frequency of the signal to be measured based on the count value outputted at the predetermined period.

摘要翻译： 一种用于测量包括脉冲信号的待测信号的频率的频率测量装置，包括：将待测信号乘以n的整数的信号乘法器部分，并输出相乘的信号; 计数部分，其以预定的门限时间对所乘的信号进行计数，并以预定的周期输出要测量的信号的频率的计数值; 以及低通滤波器，其基于在预定周期输出的计数值输出与待测信号的频率相对应的信号。

公开(公告)号：US07692419B1

公开(公告)日：2010-04-06

申请号：US11527898

申请日：2006-09-26

申请人： John Peel

发明人： John Peel

IPC分类号： G06M1/10 ,  G01R23/14

CPC分类号： G01R23/14 ,  G01R23/10

摘要： A system and method for enhanced frequency measurement. Embodiments provide an effective mechanism for reducing error associated with frequency measurements by amplifying the frequency of the signal fed to the frequency counter, thereby increasing the number of counts and reducing the error associated with each frequency measurement. Reductions in error enable the gate time for the frequency counter to be reduced, thereby increasing efficiency and cost-savings. After accessing the counts provided for the amplified frequency, the original frequency before amplification may be determined by reducing the amplified frequency (e.g., represented by the accessed counts) by the amount by which the original frequency was amplified. Embodiments provide an effective and efficient mechanism for automatically determining the amount of amplification for a given signal based upon its frequency and a maximum frequency of at least one of the frequency amplification component and the frequency counter.

摘要翻译： 一种用于增强频率测量的系统和方法。 实施例提供了一种用于通过放大馈送到频率计数器的信号的频率来减少与频率测量相关联的误差的有效机制，由此增加计数数量并减少与每个频率测量相关联的误差。 降低误差使频率计数器的门禁时间减少，从而提高效率和节省成本。 在访问为放大的频率提供的计数之后，放大前的原始频率可以通过将放大的频率（例如，由访问的计数表示）乘以原始频率被放大的量来确定。 实施例提供了一种有效和有效的机制，用于基于频率和频率放大组件和频率计数器中的至少一个的频率和最大频率来自动确定给定信号的放大量。