公开(公告)号：US09520954B1

公开(公告)日：2016-12-13

申请号：US15009309

申请日：2016-01-28

Applicant: Keysight Technologies, Inc.

Inventor： Jan Verspecht ,  Keith F. Anderson

IPC: H04B17/00 ,  H04B1/16 ,  H04B17/20 ,  H04B1/26 ,  H04L7/00

CPC classification number: H04B17/20 ,  H04B1/26 ,  H04B17/0085

Abstract: A system and method supply a test signal having a first tone at a first RF frequency and a second tone at a second RF frequency to a frequency converter; provide a local oscillator (LO) signal to the frequency converter, wherein an IF output signal of the frequency converter is supplied to an input of an intermediate frequency (IF) filter, in response to which the IF filter provides a filtered IF output signal; for each of N>1 different LO frequencies, measure the filtered IF output signal at a pair of IF frequencies corresponding to differences between the first and second RF frequencies and the LO frequency, where the measurements of the filtered IF output signal measure time-invariant phase; and ascertain N−1 values of phase dispersion D of the IF filter at N−1 corresponding IF frequencies from the N measurements of the filtered IF output signal at the N different LO frequencies.

Abstract translation: 系统和方法将具有第一RF频率的第一音调和第二RF频率的第二音调的测试信号提供给频率转换器; 向所述变频器提供本地振荡器（LO）信号，其中所述频率转换器的IF输出信号被提供给中频（IF）滤波器的输入，响应于所述IF滤波器提供经滤波的IF输出信号; 对于N≥1个不同的LO频率中的每一个，对于与第一和第二RF频率之间的差对应的一对IF频率和LO频率来测量经滤波的IF输出信号，其中滤波的IF输出信号的测量测量时不变 相; 并且从N个不同LO频率处的滤波后的IF输出信号的N个测量值确定在N-1个对应的IF频率处的IF滤波器的相位色散D的N-1个值。

公开(公告)号：US09252895B1

公开(公告)日：2016-02-02

申请号：US14341383

申请日：2014-07-25

Applicant: Keysight Technologies, Inc

Inventor： Jan Verspecht

IPC: H04B1/00 ,  H04B17/29 ,  H04B1/16 ,  H03D7/14

CPC classification number: H04B17/29 ,  H03D7/1441

Abstract: A system for measuring a full spectrum of a modulated output signal provided by a device under test (DUT) includes a signal generating device that provides a radio frequency (RF) stimulus signal to the DUT, and generates a trigger signal, where the DUT outputs the modulated output signal in response. A receiver, having an intermediate frequency (IF) bandwidth less than a total bandwidth of the modulated output signal, includes mixers, an analog-to-digital converter (ADC) triggered by the trigger signal, and a local oscillator (LO) that consecutively generates multiple LO signals having different LO frequencies. A harmonic phase reference (HPR) generator generates a repetitive HPR signal having an HPR bandwidth wider than the total bandwidth of the modulated output signal and a modulation repetition rate the same as that of the RF stimulus signal. The mixers consecutively mix the LO signals with the HPR signal and the modulated output signal to provide IF signals input to channels of the ADC to form ADC data records, respectively, that capture the full spectrum of the modulated output signal.

Abstract translation: 用于测量由被测器件（DUT）提供的调制输出信号的全谱的系统包括向DUT提供射频（RF）激励信号的信号产生装置，并产生触发信号，其中DUT输出 调制输出信号作为响应。 具有小于调制输出信号的总带宽的中频（IF）带宽的接收机包括混频器，由触发信号触发的模数转换器（ADC）以及连续的本地振荡器 产生具有不同LO频率的多个LO信号。 谐波相位参考（HPR）发生器产生具有比调制输出信号的总带宽宽的HPR带宽的重复HPR信号，以及与RF刺激信号相同的调制重复率。 混频器将LO信号与HPR信号和调制输出信号连续混合，以将IF信号输入到ADC的通道，分别形成ADC数据记录，捕获调制输出信号的全谱。

公开(公告)号：US20160028498A1

公开(公告)日：2016-01-28

申请号：US14341383

申请日：2014-07-25

Applicant: Keysight Technologies, Inc.

Inventor： Jan Verspecht

IPC: H04B17/29 ,  H04B1/16

CPC classification number: H04B17/29 ,  H03D7/1441

Abstract: A system for measuring a full spectrum of a modulated output signal provided by a device under test (DUT) includes a signal generating device that provides a radio frequency (RF) stimulus signal to the DUT, and generates a trigger signal, where the DUT outputs the modulated output signal in response. A receiver, having an intermediate frequency (IF) bandwidth less than a total bandwidth of the modulated output signal, includes mixers, an analog-to-digital converter (ADC) triggered by the trigger signal, and a local oscillator (LO) that consecutively generates multiple LO signals having different LO frequencies. A harmonic phase reference (HPR) generator generates a repetitive HPR signal having an HPR bandwidth wider than the total bandwidth of the modulated output signal and a modulation repetition rate the same as that of the RF stimulus signal. The mixers consecutively mix the LO signals with the HPR signal and the modulated output signal to provide IF signals input to channels of the ADC to form ADC data records, respectively, that capture the full spectrum of the modulated output signal.

Abstract translation: 用于测量由被测器件（DUT）提供的调制输出信号的全谱的系统包括向DUT提供射频（RF）激励信号的信号产生装置，并产生触发信号，其中DUT输出 调制输出信号作为响应。 具有小于调制输出信号的总带宽的中频（IF）带宽的接收机包括混频器，由触发信号触发的模/数转换器（ADC）以及连续的本地振荡器 产生具有不同LO频率的多个LO信号。 谐波相位参考（HPR）发生器产生具有比调制输出信号的总带宽宽的HPR带宽的重复HPR信号，以及与RF刺激信号相同的调制重复率。 混频器将LO信号与HPR信号和调制输出信号连续混合，以将IF信号输入到ADC的通道，分别形成ADC数据记录，捕获调制输出信号的全谱。

公开(公告)号：US11137445B1

公开(公告)日：2021-10-05

申请号：US16456305

申请日：2019-06-28

Applicant: Keysight Technologies, Inc.

Inventor： Jan Verspecht ,  Augustine Stav

IPC: G01R31/317 ,  G01R1/067 ,  H03L7/183

Abstract: 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.

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

IPC: H04L5/12 ,  H04L23/02 ,  H04L27/26 ,  H04L27/156 ,  H04B1/58 ,  H04B1/00

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.

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

IPC: H04B1/04 ,  H04B1/16 ,  H04B17/21 ,  H04L27/26 ,  H03D7/14 ,  H03L7/00 ,  H04B17/00 ,  H04L27/28

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.