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

IPC: H04B17/00 ,  H04B17/29 ,  H04B15/00

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.

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

IPC: H04B1/26 ,  H03D7/14 ,  H04B1/16

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.

公开(公告)号：US20170187475A1

公开(公告)日：2017-06-29

申请号：US14981861

申请日：2015-12-28

Applicant: Keysight Technologies, Inc.

Inventor： Troels Studsgaard Nielsen ,  Jan Verspecht

IPC: 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.

公开(公告)号：US20190064236A1

公开(公告)日：2019-02-28

申请号：US15690934

申请日：2017-08-30

Applicant: Keysight Technologies, Inc.

Inventor： Jan Verspecht ,  Keith F. Anderson ,  Joel P. Dunsmore

IPC: G01R23/20 ,  G01R27/28 ,  H04B17/00 ,  H04B17/29 ,  H04L27/26

Abstract: 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.

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.

公开(公告)号：US12158491B1

公开(公告)日：2024-12-03

申请号：US17874517

申请日：2022-07-27

Applicant: Keysight Technologies, Inc.

Inventor： Jan Verspecht ,  Bogdan Szafraniec

IPC: G01R31/26

Abstract: A test circuit for measuring phase distortion includes a first laser, a second laser and a photo diode. The first laser is tuned to a first frequency f1 and generates a first optical signal. The second laser is tuned to a second frequency f2 and generates a second optical signal and phase modulates the second optical signal with a periodic signal with a repetition frequency fM. The photo diode receives and mixes the first optical signal and the second optical signal, and produces a first tone at a third frequency f3, which is a carrier frequency equal to an absolute value of a difference between the second frequency f2 and the first frequency f1, a second tone at a fourth frequency f4 at a difference between the third frequency f3 and the repetition frequency fM, and a third tone at a fifth frequency f5 at a sum of the third frequency f3 and the repetition frequency fM.

公开(公告)号：US11268997B1

公开(公告)日：2022-03-08

申请号：US16996561

申请日：2020-08-18

Applicant: Keysight Technologies, Inc.

Inventor： Jan Verspecht ,  Augustine Stav

IPC: G01L21/32 ,  G01R23/20 ,  H04L27/38 ,  G01R27/28 ,  G01R35/00 ,  H01J41/04 ,  H01J41/06 ,  H01J41/16 ,  H01J41/14 ,  G01L21/00 ,  G01L21/34 ,  G01L19/08

Abstract: 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.

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

IPC: H04B3/46 ,  H04B17/10 ,  H04L27/10

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.

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

IPC: H04B17/10 ,  H04L27/10

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。

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

IPC: H03K5/00 ,  G01R23/16

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。