Keysight Technologies, Inc.

Agilent Technologies, Inc.

Chen-Yu Chi

Hassan Tanbakuchi

Richard Lynn Rhymes

Kenneth H Wong

Matthew Richter

Michael Mikulka

Thomas Zwick

Cinda Lynette Craven

A system and method corrects the phase of measurement signals obtained from remote heads during testing of a device. A first signal is transmitted along first and second transmission lines to respective remote heads. A shunt switch is connected between a remote end of the first transmission line and a first remote head, and another shunt switch is connected between a remote end of the second transmission line and a second remote head. The shunt switches in a first configuration respectively reflect the first signal back to a phase measurement apparatus as first and second reflected signals. The phase measurement apparatus determines a first reference phase and a second reference phase respectively based on the first and second reflected signals. A compensation unit compensates phase of the measurement signals based on the first and second reference phases.

Apparatus and method for cable phase correction for vector analyzer remote heads

Described is a directional coupler for forward coupling energy from an input port to a coupling port. The directional coupler has a coupling factor and an operating frequency and an operating wavelength corresponding to the operating frequency.

Forward coupled directional coupler

A configurable feedback path is included in an amplitude control system having a signal source and an amplitude controller, and provides accurate tracking between a signal provided at a test port and a reference signal, whether or not the configurable feedback path is in an internally-leveled configuration or an externally-leveled configuration. The configurable feedback path includes a series of access ports, a detector that has an input coupled to the first access port, a filtered output coupled to the amplitude controller, and an unfiltered output providing the reference signal. The configurable feedback path also includes a signal separator that has an input terminal coupled to the signal source, a thru-terminal coupled to the third access port, and a coupled terminal that is coupled to the second access port. The fourth access port is coupled to the test port.

Configurable feedback path in an amplitude control system

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Santa Rosa, CA, United States of America

Chen-Yu Chi