# US 11,121,780 B2 · System and method for calibrating a multi-channel radio frequency signal generation system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,121,780 B2 - Document ID: US11121780B2 - Status: Granted - Kind: B2 - Application number: 17/126,428 - Filed: 2020-12-18 - Published: 2021-07-29 - Granted: 2021-09-14 - Earliest claimed: 2020-01-28 - Assignees: Rohde & Schwarz GmbH & Co. KG - Applicants: Rohde & Schwarz GmbH & Co. KG - Inventors: Bessern Baccouche; Rachid El-Assir; Angel Teofilov; Michael Koenig - Web page: https://patentgrep.com/patent/US11121780B2 ## CPC - H04B 17/0085: {using test signal generators} - H04B 17/11: for calibration - H04B 7/0413: MIMO systems - H04B 17/12: of transmit antennas, e.g. of the amplitude or phase - H04B 17/14: of the whole transmission and reception path, e.g. self-test loop-back - H04B: TRANSMISSION ## Abstract A system for calibrating a multi-channel radio frequency signal generation system is described. At least two signal sources and a calibration unit are provided. A calibration data module is provided that is assigned to at least one of the signal sources. The at least two signal sources are assigned to at least two signal channels. In a first operation mode, the calibration unit is connected with the at least two signal channels simultaneously. The calibration unit is configured to gather calibration data assigned to the at least two signal channels. The system is configured to transfer the calibration data gathered from the calibration unit to the calibration data module. In a second operation mode, the system is configured to disconnect the at least two signal channels from the calibration unit and to connect the at least two signal channels with a device under test. Further, a method of calibrating a multi-channel radio signal generation frequency system is described. ## Claims ### Claim 1 A system for calibrating a multi-channel radio frequency signal generation system, comprising: at least two signal sources; a calibration circuit; a calibration data circuit assigned to at least one of the signal sources, wherein the at least two signal sources are assigned to at least two signal channels, wherein the calibration circuit, in a first operation mode, is connected with the at least two signal channels simultaneously, wherein the calibration circuit is configured to gather calibration data assigned to the at least two signal channels, wherein the system is configured to transfer the calibration data gathered from the calibration circuit to the calibration data circuit, and wherein, in a second operation mode, the system is configured to disconnect the at least two signal channels from the calibration circuit and to connect the at least two signal channels with a device under test. ### Claim 2 (depends on 1) The system according to claim 1, further comprising a switch matrix assigned to the at least two signal channels. ### Claim 3 (depends on 2) The system according to claim 2, wherein the switch matrix is configured to switch the at least two signal channels from the calibration circuit to the device under test automatically. ### Claim 4 (depends on 2) The system according to claim 2, wherein the switch matrix is configured to be controlled by at least one of a test sequence executed, the calibration circuit or at least one of the signal sources. ### Claim 5 (depends on 1) The system according to claim 1, wherein the calibration data gathered is transferred manually and/or automatically from the calibration circuit to the calibration data circuit. ### Claim 6 (depends on 1) The system according to claim 1, wherein a communication circuit is provided that is configured to transfer the calibration data gathered, wherein the communication circuit is connected with the calibration circuit and the calibration data circuit. ### Claim 7 (depends on 1) The system according to claim 1, wherein the calibration data circuit is incorporated in at least one of the signal sources. ### Claim 8 (depends on 7) The system according to claim 7, wherein each of the signal sources encompasses a respective calibration data circuit. ### Claim 9 (depends on 1) The system according to claim 1, wherein the calibration circuit comprises a coherent receiver. ### Claim 10 (depends on 1) The system according to claim 1, wherein the calibration data is measured by a measurement circuit of the calibration circuit. ### Claim 11 (depends on 1) The system according to claim 1, wherein the calibration data is calculated by a calibrating circuit of the calibration circuit. ### Claim 12 (depends on 1) The system according to claim 1, wherein the calibration circuit is configured to generate calibration data for at least one of frequency, level or modulation bandwidth. ### Claim 13 (depends on 1) The system according to claim 1, wherein the calibration circuit is configured to generate correction data for correction of at least one of modulation bandwidth or group delay. ### Claim 14 (depends on 1) The system according to claim 1, wherein one of the signal sources corresponds to a reference source. ### Claim 15 A method of calibrating a multi-channel radio signal generation frequency system comprising: generating at least two signals by at least two signal sources; forwarding the signals via at least two signal channels, respectively; receiving the signals by a calibration circuit simultaneously; gathering calibration data by the calibration circuit; transferring the calibration data gathered from the calibration circuit to a calibration data circuit that is assigned to at least one of the signal sources; applying the calibration data gathered; and disconnecting the at least two signal channels from the calibration circuit and connecting the at least two signal channels with a device under test. ### Claim 16 (depends on 15) The method according to claim 15, wherein the calibration data gathered comprises calibration data for at least one of frequency, level or modulation bandwidth. ### Claim 17 (depends on 15) The method according to claim 15, wherein correction data is gathered by the calibration circuit, and wherein the correction data generated comprises correction data for correction of at least one of modulation bandwidth or group delay.