公开(公告)号：US11927661B2

公开(公告)日：2024-03-12

申请号：US17733515

申请日：2022-04-29

Applicant: Keysight Technologies, Inc.

Inventor： Keith F. Anderson ,  Alex Grichener

IPC: G01R35/00 ,  G01R27/28 ,  H04B17/21

CPC classification number: G01R35/00 ,  G01R27/28 ,  H04B17/21

Abstract: A method is provided for calibrating a test system, including first and second test instruments. The method includes connecting a first test port of the first test instrument to a second test port of the second test instrument; generating a first RF signal using a first RF source of the first test instrument while a second RF source of the second test instrument is turned off; measuring first phase of the first RF signal at the first test port using first incident and reflected signals; generating a second RF signal using a second RF source of the second test instrument while the first RF source; measuring second phase of the second RF signal at the first test port using the second incident signal and reflected signals; determining a phase difference between the first and second phases; and adjusting the first and/or second RF source to remove the determined phase difference.

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：US09654124B1

公开(公告)日：2017-05-16

申请号：US15011306

申请日：2016-01-29

Applicant: Keysight Technologies, Inc.

Inventor： Keith F. Anderson ,  Jean-Pierre Teyssier

IPC: H03L7/24 ,  H03L7/197

CPC classification number: H03L7/24 ,  G06F1/022 ,  G06F1/0328 ,  H03L7/1974 ,  H03L7/23

Abstract: An apparatus, a signal source, and a method for operating the same are disclosed. The apparatus includes a first signal source, a port, controller, signal synthesizer, and a first timestamp register. The port is adapted to receive a first clock signal that includes a sequence of pulses at a constant clock frequency. The signal synthesizer generates an output signal in response to inputs from the controller, the output signal having a first frequency. The first timestamp register counts pulses from the first clock signal. The controller is adapted to receive a command to change the output signal frequency from the first frequency to a second frequency, the controller causing the signal synthesizer to change the output signal frequency to the second frequency and to generate a frequency change timestamp from the timestamp register indicating a time at which the output signal changed from the first frequency to the second frequency.

公开(公告)号：US20170111127A1

公开(公告)日：2017-04-20

申请号：US14883490

申请日：2015-10-14

Applicant: Keysight Technologies, Inc.

Inventor： Gregory D. VanWiggeren ,  Keith F. Anderson ,  Nilesh R. Gheewala

IPC: H04B17/15 ,  H04B17/00

CPC classification number: H04B17/15 ,  H04B17/0085 ,  H04B17/21 ,  H04L5/00

Abstract: Network analysis employs a band-limited multi-tone test signal having a tunable center frequency to test a device under test (DUT). A hybrid network analyzer includes a test signal source to provide the band-limited multi-tone test signal, and a local oscillator (LO) source to provide a tunable LO signal configured to track the tunable center frequency of the band-limited multi-tone test signal. The hybrid network analyzer further includes a receiver to convert into an intermediate frequency (IF) signal using the tunable LO signal one or both of the band-limited multi-tone test signal and a response signal from a device under test (DUT) produced in response to the band-limited multi-tone test signal. The test signal source is further configured to provide a tunable single-tone test signal and a broadband multi-tone test signal to test the DUT in various modes.