1
David V Blackham, Jason Chodora, Joel P Dunsmore: Error correction method for reflection measurements of reciprocal devices in vector network analyzers. Hewlett Packard Company, John L Imperato, May 9, 2000: US06060888 (109 worldwide citation)

An error correction method improves measurement accuracy of a vector network analyzer by reducing reflection measurement errors for a broad class of devices, such as filters, switches, cables, couplers, attenuators, and other passive devices tested by vector network analyzers (VNAs) that are recipro ...


2
David V Blackham, Douglas K Rytting: Compensating for unequal load and source match in vector network analyzer calibration. Agilent Technologies, December 28, 2004: US06836743 (16 worldwide citation)

A method and a vector network analyzer compensate for unequal source match and load match of a test port of the vector network analyzer. The method characterizes the source match and the load match, computes a delta-match factor from the characterized source match and load match, and uses the delta- ...


3
Kenneth H Wong, David V Blackham, Joel P Dunsmore: VNA and method for addressing transmission line effects in VNA measurement data. Agilent Technologies, December 12, 2006: US07148702 (8 worldwide citation)

In one embodiment, a vector network analyzer (VNA) comprises a plurality of ports for coupling to a device under test (DUT), at least one reference receiver for measuring signals associated with the DUT, and logic for processing measurement data from the at least one reference receiver to compensate ...


4
Keith F Anderson, David V Blackham, Brad R Hokkanen, Kenneth H Wong: Multiport calibration simplification using the “unknown thru” method. Agilent Technologies, March 28, 2006: US07019536 (5 worldwide citation)

In one embodiment, a method of calibrating a multi-port vector network analyzer (VNA) includes (i) performing two-port calibrations on pairs of ports to determine forward and reverse systematic error terms associated with each pair of ports, wherein the pairs of ports are selected such that each por ...


5
Kenneth H Wong, David V Blackham, James C Liu, Keith F Anderson: Method for implementing TRL calibration in VNA. Agilent Technologies, October 17, 2006: US07124049 (4 worldwide citation)

In one embodiment, a method comprises storing parameters that are related to switch error correction terms of a vector network analyzer (VNA), and applying a calibration process of a TRL group of calibration processes to the VNA to generate calibration measurements, wherein the calibration process g ...


6
James C Liu, Kenneth H Wong, David V Blackham: Vector network analyzer mixer calibration using the unknown thru calibration. Agilent Technologies, February 7, 2006: US06995571 (4 worldwide citation)

In one embodiment, a method comprises applying a stimulus signal to a reference frequency translation device (FTD) by a vector network analyzer during a calibration mode, wherein the reference FTD possesses equal conversion efficiency in forward and reverse directions and the reference FTD possesses ...


7
David V Blackham, Kenneth H Wong: System and method for determining measurement errors of a testing device. Agilent Technologies, November 23, 2004: US06823276 (3 worldwide citation)

A system and method are disclosed which provide for flexible and accurate test apparatus error value calculation. Error value calculation of a testing apparatus requires at least one unique measurement for each unknown error value using the equation that relates the measured response, the predicted ...


8
Keith F Anderson, David V Blackham, Joel P Dunsmore, Loren C Betts, Nicholas C Leindecker: Differential vector network analyzer. Agilent Technologies, June 9, 2009: US07545150 (1 worldwide citation)

A measurement and correction method provides for a complete full correction of a true-mode system using only the single ended error matrix developed for 4 port correction of single ended measurements. The degree of misalignment of the balanced sources may be determined from these measurements.


9
Loren C Betts, David V Blackham, Michael C Dobbert, Xiaolong Li, Dara Sariaslani, Lisa Shenton, Erwin F Siegel, Bernadette Smith, Matt Todhunter, Kenneth H Wong: Determining operating characteristics of signal generator using measuring device. Keysight Technologies, April 25, 2017: US09632122

A method determines operating characteristics of a signal generator. The method includes performing a first set of measurements of an output signal generated by the signal generator and corresponding reflected signal, where the first set of measurements is performed over multiple frequencies and amp ...


10
David V Blackham, Kenneth H Wong: System and method for determining measurement errors of a testing device. Agilent Technologies, Legal Department DL429, October 7, 2004: US20040199350-A1

A system and method are disclosed which provide for flexible and accurate test apparatus error value calculation. Error value calculation of a testing apparatus requires at least one unique measurement for each unknown error value using the equation that relates the measured response, the predicted ...