公开(公告)号：US20240313795A1

公开(公告)日：2024-09-19

申请号：US18591468

申请日：2024-02-29

Applicant: Tektronix, Inc.

Inventor： Kan Tan

IPC: H03M1/10

CPC classification number: H03M1/108 ,  H03M1/1014 ,  H03M1/1085

Abstract: A test and measurement instrument includes one or more channels to receive a signal under test, each channel comprising an input port, a filter, and a sampler, at least one analog-to-digital converter (ADC), the at least one ADC having two pipes connected to the sampler of one of the one or more channels, the at least one ADC to produce digital samples of the signal at a sample rate, and one or more processors configured to execute code that causes the one more processors to acquire a spectrum of the digital samples for each pipe in the at least one ADC, and use the spectrums of the digital samples for each pipe in the at least one ADC to reconstruct the spectrum of the signal under test. A method of operating a test and measurement instrument, and a method a method of calibrating a test and measurement instrument is included.

公开(公告)号：US08788234B2

公开(公告)日：2014-07-22

申请号：US12905611

申请日：2010-10-15

Applicant: John J. Pickerd

Inventor： John J. Pickerd

IPC: G06F15/00

CPC classification number: G01R13/0272 ,  G01R31/3191 ,  G01R35/002 ,  H03M1/0626 ,  H03M1/1033 ,  H03M1/1085 ,  H03M1/1215

Abstract: In a multi-channel oscilloscope a method of calibrating interleaved digitizer channels initially calibrates each digitizer channel to produce a bandwidth enhanced filter for each digitizer channel to match the respective channel frequency and phase characteristics. The oscilloscope is then configured for interleaved operation whereby an input signal is applied to at least two digitizers via a switch through a common preamplifier to produce a reference digitizer channel and an interleaved digitizer channel where the bandwidth enhanced filter for the interleaved digitizer channel is now not correct. Fast Fourier transforms are performed on the data from the reference digitizer channel and the interleaved digitizer channel, from which are derived a match filter for the interleaved digitizer channel so the interleaved digitizer channel and reference digitizer channel are matched in phase and magnitude at all frequencies.

Abstract translation: 在多通道示波器中，校准交错数字转换器通道的方法最初校准每个数字转换器通道以产生用于每个数字转换器通道的带宽增强滤波器，以匹配相应的通道频率和相位特性。 然后将示波器配置成用于交错操作，由此通过公共前置放大器经由开关将输入信号施加到至少两个数字转换器，以产生参考数字转换器通道和交错数字转换器通道，其中用于交错数字转换器通道的带宽增强滤波器现在不是 正确。 对来自参考数字转换器通道和交错数字转换器通道的数据执行快速傅立叶变换，从而从交错数字转换器通道导出匹配滤波器，使得交织的数字转换器通道和参考数字转换器通道在所有频率的相位和幅度上匹配。

公开(公告)号：US07720645B2

公开(公告)日：2010-05-18

申请号：US11534005

申请日：2006-09-21

Applicant: Stephane Kirmser ,  Heinz Mattes ,  Sebastian Sattler

Inventor： Stephane Kirmser ,  Heinz Mattes ,  Sebastian Sattler

IPC: G01R31/28

CPC classification number: G01R31/318371 ,  H03M1/1085 ,  H03M1/12

Abstract: A test apparatus for testing digitized test responses has a generator and a signal extractor. The generator uses direct digital synthesis to generate a set of n digital reference signals which are orthogonal to one another. In this case, n is a natural number greater than 1. The signal extractor contains a test input and reference inputs. The test input receives a digitized test response and the reference inputs are connected to the reference signals which are generated by the generator. The signal extractor generates scalar products from a respective reference signal and the test response and uses the products to calculate whether a combination of reference signals is contained in the test response.

Abstract translation: 用于测试数字化测试响应的测试装置具有发生器和信号提取器。 发生器使用直接数字合成来产生彼此正交的一组n个数字参考信号。 在这种情况下，n是大于1的自然数。信号提取器包含测试输入和参考输入。 测试输入接收数字化的测试响应，参考输入连接到由发生器产生的参考信号。 信号提取器从相应的参考信号和测试响应产生标量产物，并使用产品来计算参考信号的组合是否包含在测试响应中。

公开(公告)号：US20070247344A1

公开(公告)日：2007-10-25

申请号：US10581549

申请日：2004-11-30

Applicant: Patrick Gremillet

Inventor： Patrick Gremillet

IPC: H03M1/12

CPC classification number: H03M1/1052 ,  H03M1/1085 ,  H03M1/1215

Abstract: The invention relates to a method for generating a digital signal representative of the pairing error between the channels of an analog digital conversion system with time interleaving, a method for suppressing the errors thus calculated and an analog digital conversion system with time interleaving using same. The present invention proposes a less complex digital solution since it does not require the extraction of the defects of the signal at the output of the converter. It makes it possible to correct the pairing errors by the direct creation of digital signals representative of these errors, and their subtraction from the digitized signal at the output of the conversion system. An object of the invention is a method for generating a digital signal representative of the pairing error between the channels of an analog digital conversion system with time interleaving (CAN 10) comprising an analog digital converter (CAN1, CAN2,...,CANN) on each channel. The said method comprises the determination of the spectrum (11-12) of said digital signal as a function of the frequency response of the analog digital conversion system with time interleaving (CAN 10) to at least one analog calibration signal (IC).

Abstract translation: 本发明涉及一种用于产生代表模拟数字转换系统的信道与时间交织之间的配对误差的数字信号的方法，一种用于抑制如此计算的误差的方法和使用其的时间交织的模拟数字转换系统。 本发明提出了一种较不复杂的数字解决方案，因为它不需要在转换器的输出处提取信号的缺陷。 通过直接创建表示这些错误的数字信号，以及从转换系统的输出端的数字化信号中减去配对误差，可以实现这一点。 本发明的目的是一种用于产生代表模拟数字转换系统的通道与时间交错（CAN 10）之间的配对误差的数字信号的方法，包括模拟数字转换器（CAN＆lt; 1＆gt; 每个通道上的CAN _{2 ，...，CAN N ）。 所述方法包括根据随时间交织（CAN 10）至少一个模拟校准信号（IC）的模拟数字转换系统的频率响应的函数来确定所述数字信号的频谱（11-12）。}

公开(公告)号：US06819279B2

公开(公告)日：2004-11-16

申请号：US10379648

申请日：2003-03-05

Applicant: Peter J. Pupalaikis

Inventor： Peter J. Pupalaikis

IPC: H03M112

CPC classification number: H03M1/1038 ,  H03M1/1085 ,  H03M1/1215

Abstract: A method and apparatus of processing waveforms acquired in a waveform digitizing instrument utilizing multiple, interleaved digitizing elements is provided to improve the accuracy of the data acquired is provided. The present method utilizes measured analog-to-digital converter frequency response characteristics to generate sets of coefficients. When data is acquired by a waveform digitizing system, the present method utilizes these coefficients to correct the waveform, thus undoing the adverse effects of the non-ideal frequency response characteristics, resulting in a waveform acquired with higher fidelity. The waveform resulting from this method is a waveform that more closely represents the signal sampled by the digitizing system.

Abstract translation: 提供了一种处理在采用多个交错数字化元素的波形数字化仪器中获取的波形的方法和装置，以提供所提取的数据的准确度。 本方法利用测量的模 - 数转换器频率响应特性来产生一组系数。 当通过波形数字化系统获取数据时，本方法利用这些系数来校正波形，从而消除非理想频率响应特性的不利影响，导致以更高保真度获取的波形。 由该方法产生的波形是更接近地表示由数字化系统采样的信号的波形。

公开(公告)号：US20040174284A1

公开(公告)日：2004-09-09

申请号：US10379648

申请日：2003-03-05

Inventor： Peter J. Pupalaikis

IPC: H03M001/00

CPC classification number: H03M1/1038 ,  H03M1/1085 ,  H03M1/1215

Abstract: A method and apparatus of processing waveforms acquired in a waveform digitizing instrument utilizing multiple, interleaved digitizing elements is provided to improve the accuracy of the data acquired is provided. The present method utilizes measured analog-to-digital converter frequency response characteristics to generate sets of coefficients. When data is acquired by a waveform digitizing system, the present method utilizes these coefficients to correct the waveform, thus undoing the adverse effects of the non-ideal frequency response characteristics, resulting in a waveform acquired with higher fidelity. The waveform resulting from this method is a waveform that more closely represents the signal sampled by the digitizing system.

Abstract translation: 提供了一种处理在采用多个交错数字化元素的波形数字化仪器中获取的波形的方法和装置，以提供所提取的数据的准确度。 本方法利用测量的模 - 数转换器频率响应特性来产生一组系数。 当通过波形数字化系统获取数据时，本方法利用这些系数来校正波形，从而消除非理想频率响应特性的不利影响，导致以更高保真度获取的波形。 由该方法产生的波形是更接近地表示由数字化系统采样的信号的波形。

公开(公告)号：US20040161028A1

公开(公告)日：2004-08-19

申请号：US10777094

申请日：2004-02-13

Inventor： Gordon Roberts ,  Chris Taillefer

IPC: H04Q001/20

CPC classification number: H03M1/1085 ,  G01R29/26 ,  G01R31/3167 ,  H03M1/12 ,  H03M1/66

Abstract: An apparatus suitable for use in identifying a noise component originating from a certain source of noise in a DSP-based mixed-signal system is provided. The apparatus includes a processing unit which receives a first signal released by a first signal path, the first signal path including a digital-to-analog converter and a first analog-to-digital converter. The processing unit also receives a second signal released by a second signal path, the second signal path including the digital-to-analog converter and a second analog-to-digital converter. The first signal and the second signal are processed to derive a noise component associated to a certain source of noise, the certain source of noise being a selected one of the digital-to-analog converter, the first analog-to-digital converter and the second analog-to-digital converter. A signal indicative of the noise component associated to the certain source of noise is then released.

Abstract translation: 提供了一种适用于识别基于DSP的混合信号系统中源自某一噪声源的噪声分量的装置。 该装置包括处理单元，其接收由第一信号路径释放的第一信号，第一信号路径包括数模转换器和第一模数转换器。 处理单元还接收由第二信号路径释放的第二信号，第二信号路径包括数模转换器和第二模数转换器。 处理第一信号和第二信号以导出与特定噪声源相关联的噪声分量，该特定噪声源是数模转换器，第一模数转换器和 第二模数转换器。 然后释放指示与某个噪声源相关联的噪声分量的信号。

公开(公告)号：US06177894B1

公开(公告)日：2001-01-23

申请号：US09183644

申请日：1998-10-30

Applicant: Takahiro Yamaguchi

Inventor： Takahiro Yamaguchi

IPC: H03M110

CPC classification number: H03M1/1085 ,  H03M1/12

Abstract: An instantaneous differential non-linearity DNL can be determined with a high accuracy with a reduced volume of computation and independently from a testing frequency while allowing an evaluation of factors in a compounded fault. A sine signal is applied to an AD converter 14 under test, a conversion output of which is divided into a sine component and a cosine component, with local maxima or minima aligned with each other. A square sum of the individual samples is formed, and a square root of the square sum is formed to determine an instantaneous amplitude (21). The amplitude of the sine wave signal is interleaved into a series of instantaneous amplitudes (20), and a first stage of the wavelet transform (46) is applied to the interleaved series of instantaneous amplitudes, with its output being oversampled to perform a second stage of wavelet transform (46′). A maximum amplitude of the transform output is detected by peak detector 23′. A detected value is used to estimate the DNL.

Abstract translation: 瞬时微分非线性DNL可以以较低的计算量和精度独立于测试频率以高精度确定，同时允许对复合故障中的因素进行评估。 正弦信号被施加到被测试的AD转换器14，其转换输出被分成正弦分量和余弦分量，其中局部最大值或最小值彼此对准。 形成各个样本的平方和，形成平方和的平方根以确定瞬时振幅（21）。 正弦波信号的振幅被交织成一系列瞬时振幅（20），小波变换（46）的第一级被施加到交错的瞬时振幅系列，其输出被过采样以执行第二级 的小波变换（46'）。 峰值检测器23'检测变换输出的最大幅度。 检测值用于估计DNL。

公开(公告)号：US09698809B1

公开(公告)日：2017-07-04

申请号：US15213993

申请日：2016-07-19

Applicant: Schweitzer Engineering Laboratories, Inc.

Inventor： Travis C Mallett

IPC: H03M1/10 ,  H03M1/12 ,  H03M3/00

CPC classification number: H03M1/1071 ,  H03M1/1076 ,  H03M1/1085 ,  H03M1/12 ,  H03M1/1245 ,  H03M3/458

Abstract: Disclosed are systems and methods for identifying and reporting failures of an analog to digital (A/D) conversion system. An A/D conversion system includes a test signal generator configured to generate a test signal including an identifiable characteristic, an A/D converter configured to convert an analog signal measured at an input of the A/D converter to a digital output, and signal injection circuitry configured to inject at least a portion of the test signal from the test signal generator as an injected signal into the analog signal using trace-to-trace crosstalk. A method includes determining whether the digital output generated by the A/D converter indicates the identifiable characteristic.

公开(公告)号：US09160358B2

公开(公告)日：2015-10-13

申请号：US14656025

申请日：2015-03-12

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sthanunathan Ramakrishnan ,  Jawaharlal Tangudu ,  Sashidharan Venkatraman ,  Karthik Khanna Subramani ,  Sreenath Narayanan Potty

IPC: H03M1/06 ,  H03M1/10 ,  H03M1/12

CPC classification number: H03M1/1085 ,  H03M1/1038 ,  H03M1/1215

Abstract: A system can include a close-in tone control configured to detect a set of close-in tones of an interleaved analog to digital converter (IADC) signal and output a trigger signal in response to the detection. The system can also include a close-in tone mismatch estimator configured to determine a correlation and a power estimate for the set of close-in tones in the IADC signal in response to the trigger signal.

Abstract translation: 系统可以包括配置成检测交错模数转换器（IADC）信号的一组接近音调的接近音调控制，并且响应于该检测而输出触发信号。 该系统还可以包括接近音调失配估计器，其被配置为响应于触发信号来确定IADC信号中的接近音调集合的相关性和功率估计。