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公开(公告)号：US09698919B1
公开(公告)日：2017-07-04
申请号：US14981861
申请日：2015-12-28
Applicant: Keysight Technologies, Inc.
Inventor： Troels Studsgaard Nielsen , Jan Verspecht
IPC: H04B1/10 , H04B17/345
CPC classification number: H04B17/345 , H04B17/103 , H04B17/12
Abstract: A system and method sequentially measure the amplitude and phase of a signal in each of two or more noncontiguous spectrum segments (e.g., harmonics) which each include two or more portions which together span the spectrum segment, using a local oscillator (LO) signal whose frequency and phase change for each measurement. The measured phase of the signal for at least one of the portions in each spectrum segment is adjusted to account for the change of phase in the LO signal from measurement of one portion to another, using phases of one or more pilot tones measured in each portion. The phase-adjusted measurements of the output signal in the various portions are stitched together to determine the amplitude and phase of the output signal across the spectrum segment. The phase relationships between the spectrum segments are determined from phases of comb teeth of a comb signal measured in each spectrum segment.
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公开(公告)号：US09673914B2
公开(公告)日：2017-06-06
申请号：US14824000
申请日：2015-08-11
Applicant: Keysight Technologies, Inc.
Inventor： Troels Studsgaard Nielsen , Jan Verspecht , Keith F. Anderson
CPC classification number: H04B17/104 , H04B1/06 , H04L5/0048 , H04L27/10
Abstract: A system and method sequentially measure the amplitude and phase of an output signal of a device under test in each of two or more frequency ranges which together span the output signal spectrum, using a local oscillator (LO) signal whose frequency changes for each measurement. The measured phase of the output signal is adjusted for at least one of the frequency ranges to account for a change of phase in the LO signal from measurement of one frequency range to another frequency range, including applying to the measured phase a phase offset determined by measuring the phase of a pilot tone using the LO signal before and after the frequency of the LO signal changes from measurement of one frequency range to another. The phase-adjusted measurements of the output signal in the two or more frequency ranges are stitched together to determine the amplitude and phase of the output signal across the output signal spectrum.
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3.发明申请METHOD AND APPARATUS FOR SPECTRAL STITCHING USING REFERENCE CHANNEL AND A PILOT TONE 有权使用参考通道和引导音调进行光谱缝合的方法和装置公开(公告)号：US20170048006A1
公开(公告)日：2017-02-16
申请号：US14824000
申请日：2015-08-11
Applicant: Keysight Technologies, Inc.
Inventor： Troels Studsgaard Nielsen , Jan Verspecht , Keith F. Anderson
CPC classification number: H04B17/104 , H04B1/06 , H04L5/0048 , H04L27/10
Abstract: A system and method sequentially measure the amplitude and phase of an output signal of a device under test in each of two or more frequency ranges which together span the output signal spectrum, using a local oscillator (LO) signal whose frequency changes for each measurement. The measured phase of the output signal is adjusted for at least one of the frequency ranges to account for a change of phase in the LO signal from measurement of one frequency range to another frequency range, including applying to the measured phase a phase offset determined by measuring the phase of a pilot tone using the LO signal before and after the frequency of the LO signal changes from measurement of one frequency range to another. The phase-adjusted measurements of the output signal in the two or more frequency ranges are stitched together to determine the amplitude and phase of the output signal across the output signal spectrum.
Abstract translation: 系统和方法使用每个测量的频率变化的本地振荡器（LO）信号顺序地测量两个或更多个频率范围中的每一个中的测试装置的输出信号的幅度和相位，该频率范围一起跨越输出信号频谱。 对于至少一个频率范围调整输出信号的测量相位，以考虑从一个频率范围的测量到另一个频率范围的LO信号中的相位变化，包括将所测量的相位施加到由 在LO信号的频率从一个频率范围的测量变为另一个频率范围之前和之后，使用LO信号来测量导频音的相位。 将两个或更多个频率范围内的输出信号的相位调整测量结合在一起以确定输出信号频谱上的输出信号的幅度和相位。
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4.发明申请METHOD AND SYSTEM FOR CALIBRATING PHASES OF COMB TEETH IN COMB SIGNAL WITH PILOT TONE AND USING CALIBRATED COMB TEETH PHASES TO MEASURE A DEVICE UNDER TEST 有权用于测试COMB信号中的混合信号与引导音的相位的方法和系统，并且使用校准的组合相位测量测试装置公开(公告)号：US20170067949A1
公开(公告)日：2017-03-09
申请号：US14848971
申请日：2015-09-09
Applicant: Keysight Technologies, Inc.
Inventor： Troels Studsgaard Nielsen , Felice Francesco Tafuri
CPC classification number: G01R25/00 , G01R35/007 , H03L7/20
Abstract: A system and method sequentially measure phases of selected comb teeth of a comb signal using a local oscillator (LO) signal whose frequency and phase are changed for each sequential measurement, and adjust the measured phases to account for the change of phase in the LO signal from measurement of one selected comb tooth to the next to ascertain reference phase differences between the selected comb teeth. The measured phases of the selected comb teeth are adjusted by applying a phase offset determined from a first phase and a second phase of a pilot tone which are measured using the LO signal, respectively, before and after the frequency and phase of the LO signal change from measurement of one comb tooth to the next. The frequency of the pilot tone is maintained to be substantially the same when measuring the first phase and the second phase of the pilot tone.
Abstract translation: 系统和方法使用每个顺序测量改变其频率和相位的本地振荡器（LO）信号顺序地测量梳状信号的选定梳齿的相位，并且调整测量的相位以考虑LO信号中的相位变化 从一个选定的梳齿的测量到下一个梳齿以确定所选梳齿之间的参考相位差。 通过应用在LO信号变化的频率和相位之前和之后分别使用LO信号测量的导频音的第一相位和第二相位确定的相位偏移来调整所选择的梳齿的测量相位。 从一个梳齿的测量到下一个。 当测量导频音的第一相位和第二相位时，导频音的频率被保持为基本相同。
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5.发明申请METHOD AND APPARATUS FOR SPECTRAL STITCHING USING REFERENCE CHANNEL AND PILOT TONES 审中-公开使用参考通道和引导波段进行光谱缝合的方法和装置公开(公告)号：US20170047915A1
公开(公告)日：2017-02-16
申请号：US14823985
申请日：2015-08-11
Applicant: Keysight Technologies, Inc.
Inventor： Troels Studsgaard Nielsen , Jan Verspecht , Joel P. Dunsmore
CPC classification number: H03K5/00006 , G01R23/18
Abstract: A system and method sequentially measure the amplitude and phase of an output signal of a device under test in each of two or more frequency ranges which together span the output signal spectrum, using a local oscillator (LO) signal whose frequency and phase change for each measurement. The measured phase of the output signal is adjusted for at least one of the frequency ranges to account for the change of phase in the LO signal from measurement of one frequency range to another frequency range, including applying to the measured phase a phase offset determined by measuring the phases of two pilot tones in the two or more frequency ranges, using the LO signal. The phase-adjusted measurements of the output signal in the two or more frequency ranges are stitched together to determine the amplitude and phase of the output signal across the output spectrum.
Abstract translation: 系统和方法使用本地振荡器（LO）信号顺序测量被测器件的输出信号的幅度和相位，其中两个或更多个频率范围中的每一个频率和相位变化一起跨越输出信号频谱，其中每个 测量。 对于至少一个频率范围调整输出信号的测量相位，以考虑从一个频率范围的测量到另一个频率范围的LO信号中的相位的变化，包括将所测量的相位施加到由 使用LO信号测量两个或更多个频率范围内的两个导频音的相位。 将两个或更多个频率范围内的输出信号的相位调整测量结合在一起以确定输出频谱上的输出信号的幅度和相位。
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Patent Agency Ranking
公开(公告)号：US11057256B1
公开(公告)日：2021-07-06
申请号：US17062726
申请日：2020-10-05
Applicant: Keysight Technologies, Inc.
Inventor： Jan Verspecht , Troels Studsgaard Nielsen
Abstract: A receiver-implemented method is for measuring a periodically modulated signal. The method includes applying a received periodically modulated signal to a mixer of a receiver, the periodically modulated signal not synchronized with the receiver, and tuning a local oscillator (LO) of the mixer using an estimate of actual carrier frequency and an estimate of an arbitrary waveform generator (AWG) sampling rate to obtain a digitized intermediate frequency (IF) signal. The method further includes applying a short time Fourier transform (STFT) to the digitized IF signal, extracting a carrier frequency offset and a AWG sampling rate offset based on the applied STFT, compensating for the carrier frequency offset, and applying a digital correction to the STFT to compensate for the AWG sampling rate offset. Compensating for the carrier frequency offset may include retuning the LO to obtain a new digitized IF signal to which the digital correction is applied.
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公开(公告)号：US10735036B1
公开(公告)日：2020-08-04
申请号：US16552596
申请日：2019-08-27
Applicant: Keysight Technologies, Inc.
Inventor： Jan Verspecht , Troels Studsgaard Nielsen
Abstract: A method for operating a data processing system to determine the actual frequency of a transmitter LO in a transmitter that up converts a repetitive input time domain signal to a repetitive RF signal is disclosed. The method includes receiving a repetitive RF signal resulting from up converting the input time domain signal and assuming a value for the transmitter LO frequency. The received signal is down converted to an IF signal using the transmitter LO frequency, and digitizes to form a time domain record, The time domain record is converted to a sequence of frequency spectra, each frequency spectrum is characterized by a time index and a plurality of plurality of phasors. The frequency difference between the assumed LO transmitter and an actual LO transmitter frequency is determined by fitting the sequence of frequency spectra to a phase tracker function of the time index and the frequency difference.
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公开(公告)号：US10003419B1
公开(公告)日：2018-06-19
申请号：US15609098
申请日：2017-05-31
Applicant: Keysight Technologies, Inc.
Inventor： Jan Verspecht , Jean-Pierre Teyssier , Troels Studsgaard Nielsen
CPC classification number: H04B17/29
Abstract: A system and method prevent interference caused by images resulting from mixing an incoming periodically modulated RF signal with multiple LO signals generated by a LO in a receiver system. The method includes determining tone frequencies of multiple tones and determining tone spacing between adjacent tones in the periodically modulated RF signal using a known period of modulation of the periodically modulated RF signal; identifying a sampling rate of an ADC of the receiver system; determining a DFT record size of samples provided by the ADC based on at least the tone spacing and the ADC sampling rate; and determining LO frequencies of the multiple LO signals based on at least the DFT record size and the ADC sampling rate, such that images created by respectively mixing the determined LO frequencies with portions of the periodically modulated RF signal avoid interfering with direct mixing components of the plurality of tones.
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公开(公告)号：US09810726B2
公开(公告)日：2017-11-07
申请号：US14848971
申请日：2015-09-09
Applicant: Keysight Technologies, Inc.
Inventor： Troels Studsgaard Nielsen , Felice Francesco Tafuri
CPC classification number: G01R25/00 , G01R35/007 , H03L7/20
Abstract: A system and method sequentially measure phases of selected comb teeth of a comb signal using a local oscillator (LO) signal whose frequency and phase are changed for each sequential measurement, and adjust the measured phases to account for the change of phase in the LO signal from measurement of one selected comb tooth to the next to ascertain reference phase differences between the selected comb teeth. The measured phases of the selected comb teeth are adjusted by applying a phase offset determined from a first phase and a second phase of a pilot tone which are measured using the LO signal, respectively, before and after the frequency and phase of the LO signal change from measurement of one comb tooth to the next. The frequency of the pilot tone is maintained to be substantially the same when measuring the first phase and the second phase of the pilot tone.
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公开(公告)号：US09793857B1
公开(公告)日：2017-10-17
申请号：US15085702
申请日：2016-03-30
Applicant: Keysight Technologies, Inc.
Inventor： Keith F. Anderson , Jan Verspecht , Troels Studsgaard Nielsen
CPC classification number: H03D7/1466 , H03L7/00 , H04B1/16
Abstract: A method for calibrating a mixer, an apparatus using the calibrated mixer, and a method for using the apparatus to calibrate another mixer are disclosed. The method includes coupling a first RF signal characterized by a first timezero phase and a first RF frequency to the RF signal input. The method includes (a) coupling a first LO signal characterized by a first LO frequency and a first LO timezero phase to the LO signal input terminal; (b) determining an IF tone timezero phase of a tone from the IF signal output corresponding to the first LO signal; and (c) determining a first after LO signal path timezero phase from the IF tone and first LO timezero phase. Steps (a), (b), and (c) are repeated for second and third LO signals. An LO phase change as a function of frequency introduced by the LO signal path is then determined.
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