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1. 发明授权

US10003419B1 Method and system of preventing interference caused by images 有权
公开(公告)号：US10003419B1
公开(公告)日：2018-06-19
申请号：US15609098
申请日：2017-05-31
申请人： Keysight Technologies, Inc.
发明人： Jan Verspecht , Jean-Pierre Teyssier , Troels Studsgaard Nielsen
IPC分类号： H04B17/00 , H04B17/29 , H04B15/00
CPC分类号： H04B17/29
摘要： 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.

2. 发明授权

US09793857B1 Method and apparatus for characterizing local oscillator path dispersion 有权
公开(公告)号：US09793857B1
公开(公告)日：2017-10-17
申请号：US15085702
申请日：2016-03-30
申请人： Keysight Technologies, Inc.
发明人： Keith F. Anderson , Jan Verspecht , Troels Studsgaard Nielsen
IPC分类号： H04B1/26 , H03D7/14 , H04B1/16
CPC分类号： H03D7/1466 , H03L7/00 , H04B1/16
摘要： 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.

3. 发明申请

US20170187475A1 METHOD AND APPARATUS FOR SPECTRAL STITCHING DISCONTINUOUS SPECTRA USING REFERENCE CHANNEL, PILOT TONES AND COMB SIGNAL 有权
公开(公告)号：US20170187475A1
公开(公告)日：2017-06-29
申请号：US14981861
申请日：2015-12-28
申请人： Keysight Technologies, Inc.
发明人： Troels Studsgaard Nielsen , Jan Verspecht
IPC分类号： H04B17/345
CPC分类号： H04B17/345 , H04B17/103 , H04B17/12
摘要： 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.

4. 发明授权

US11268997B1 Method and apparatus for characterizing homodyne transmitters and receivers 有权
公开(公告)号：US11268997B1
公开(公告)日：2022-03-08
申请号：US16996561
申请日：2020-08-18
申请人： Keysight Technologies, Inc.
发明人： Jan Verspecht , Augustine Stav
IPC分类号： G01L21/32 , G01R23/20 , H04L27/38 , G01R27/28 , G01R35/00 , H01J41/04 , H01J41/06 , H01J41/16 , H01J41/14 , G01L21/00 , G01L21/34 , G01L19/08
摘要： A system of measuring and correcting for distortions in homodyne systems and a method for operating a data processing system to provide an estimate of distortions in homodyne systems are disclosed. The method for operating a data processing system to provide an estimate of a distortion introduced by a homodyne system when the homodyne system processes a time a multi-tone time domain input signal, x(t), to obtain a time domain output signal, y(t) includes receiving a frequency spectrum, X(f), of the multi-tone time domain input signal, x(t) and measuring an output frequency spectrum, Y(f), when the homodyne system operates on x(t). A plurality of parameters of a model that represents a linear frequency response of the homodyne system when operating on X(f) to arrive at Y(f) by fitting the model to Y(f) and X(f) is determined, and the model is applied to X(f) and Y(f) to estimate the distortions.

5. 发明授权

US09673914B2 Method and apparatus for spectral stitching using reference channel and a pilot tone 有权
公开(公告)号：US09673914B2
公开(公告)日：2017-06-06
申请号：US14824000
申请日：2015-08-11
申请人： Keysight Technologies, Inc.
发明人： Troels Studsgaard Nielsen , Jan Verspecht , Keith F. Anderson
IPC分类号： H04B3/46 , H04B17/10 , H04L27/10
CPC分类号： H04B17/104 , H04B1/06 , H04L5/0048 , H04L27/10
摘要： 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.

6. 发明申请

US20170048006A1 METHOD AND APPARATUS FOR SPECTRAL STITCHING USING REFERENCE CHANNEL AND A PILOT TONE 有权
标题翻译：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
申请人： Keysight Technologies, Inc.
发明人： Troels Studsgaard Nielsen , Jan Verspecht , Keith F. Anderson
IPC分类号： H04B17/10 , H04L27/10
CPC分类号： H04B17/104 , H04B1/06 , H04L5/0048 , H04L27/10
摘要： 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.
摘要翻译：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。

7. 发明申请

US20190064236A1 NONLINEAR DISTORTION DETECTION 审中-公开
公开(公告)号：US20190064236A1
公开(公告)日：2019-02-28
申请号：US15690934
申请日：2017-08-30
申请人： Keysight Technologies, Inc.
发明人： Jan Verspecht , Keith F. Anderson , Joel P. Dunsmore
IPC分类号： G01R23/20 , G01R27/28 , H04B17/00 , H04B17/29 , H04L27/26
摘要： Nonlinear distortion of a device under test (DUT) is detected by obtaining measurements of a multi-tone input signal from a signal generator to a DUT, to obtain a measured multi-tone input signal. Measurements are also obtained of a multi-tone output signal from the DUT that is generated based on the multi-tone input signal, to obtain a measured multi-tone output signal. A correlated part of the measured multi-tone output signal that is correlated with the measured multi-tone input signal is determined insofar as the correlated part corresponds to a frequency response function of the DUT.

8. 发明授权

US09698919B1 Method and apparatus for spectral stitching discontinuous spectra using reference channel, pilot tones and comb signal 有权
公开(公告)号：US09698919B1
公开(公告)日：2017-07-04
申请号：US14981861
申请日：2015-12-28
申请人： Keysight Technologies, Inc.
发明人： Troels Studsgaard Nielsen , Jan Verspecht
IPC分类号： H04B1/10 , H04B17/345
CPC分类号： H04B17/345 , H04B17/103 , H04B17/12
摘要： 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.

9. 发明授权

US11137445B1 Method and apparatus for reducing non-linear distortion 有权
公开(公告)号：US11137445B1
公开(公告)日：2021-10-05
申请号：US16456305
申请日：2019-06-28
申请人： Keysight Technologies, Inc.
发明人： Jan Verspecht , Augustine Stav
IPC分类号： G01R31/317 , G01R1/067 , H03L7/183
摘要： A system and method for operating a data processing system to modify a time domain input signal to a signal generator to correct for distortions introduced by the signal generator are disclosed. The method includes receiving a target signal specifying a signal to be generated by the signal generator and initializing an input signal with the target signal, the method includes a) inputting the input signal to the signal generator to arrive at a signal generator output signal; b) measuring a frequency spectrum of the signal generator output signal with a test instrument; c) updating the input signal based on a comparison of said measured frequency spectrum and a frequency spectrum of target input signal; and d) repeating steps a)-c) until an exit condition is satisfied.

10. 发明授权

US11057256B1 Measurement of periodically modulated signals under non-coherent operating conditions 有权
公开(公告)号：US11057256B1
公开(公告)日：2021-07-06
申请号：US17062726
申请日：2020-10-05
申请人： Keysight Technologies, Inc.
发明人： Jan Verspecht , Troels Studsgaard Nielsen
IPC分类号： H04L5/12 , H04L23/02 , H04L27/26 , H04L27/156 , H04B1/58 , H04B1/00
摘要： 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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