Patent ID: 11927661
Assignee: KEYSIGHT TECHNOLOGIES, INC.
Field: Telecommunications (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 7:
8. A system for testing a device under test (DUT) requiring phase alignment of multiple radio frequency (RF) sources, the system comprising:
a first test instrument including a first vector network analyzer (VNA), the first test instrument comprising a first test port and a first RF source configured to generate a first RF signal during a calibrating stage; and
a second test instrument comprising a second test port and a second RF source configured to generate a second RF signal during the calibrating stage,
wherein the first test port of the first test instrument is connected to the second test port of the second test instrument;
wherein the first RF source provides the first RF signal while the second RF source is turned off, and the first VNA measures a first phase of the first RF signal provided by the first RF source at the first test port,
wherein the second RF source provides the second RF signal while the first RF source is turned off and the first VNA measures a second phase of the second RF signal provided by the second RF source at the first test port, and
wherein the measured first and second phases are compared to determine a phase difference, and at least one of the first RF source and the second RF source is phase adjusted by a phase adjustment amount to remove the phase difference and to phase align the first and second RF sources.