US 12,119,889 B2
Calibration circuit for calibrating phases and gains between channels in multi-channel beamforming system, multi-channel beamforming system including the same and channel calibration method using the same
Jinseok Park, Daejeon (KR); and Song-Cheol Hong, Daejeon (KR)
Assigned to Korea Advanced Institute of Science and Technology, Daejeon (KR)
Appl. No. 17/919,623
Filed by Korea Advanced Institute of Science and Technology, Daejeon (KR)
PCT Filed Jun. 26, 2020, PCT No. PCT/KR2020/008317
§ 371(c)(1), (2) Date Oct. 18, 2022,
PCT Pub. No. WO2021/230419, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 10-2020-0058439 (KR), filed on May 15, 2020.
Prior Publication US 2023/0361888 A1, Nov. 9, 2023
Int. Cl. H04B 17/13 (2015.01); H04B 17/12 (2015.01); H04B 17/15 (2015.01); H04B 17/21 (2015.01)
CPC H04B 17/13 (2015.01) [H04B 17/12 (2015.01); H04B 17/191 (2023.05); H04B 17/221 (2023.05)] 18 Claims
OG exemplary drawing
 
1. A calibration circuit in a multi-channel beamforming system including a plurality of channels, the calibration circuit configured to calibrate phases and gains between the plurality of channels, the calibration circuit comprising:
a selection unit connected to the plurality of channels, the selection unit configured to select two channels from among the plurality of channels, to provide a test signal to the selected two channels, and to receive a test result signal from the selected two channels;
a power detector configured to detect power of the selected two channels based on the test result signal;
an analog-to-digital converter configured to perform an analog-to-digital conversion on an output of the power detector; and
a calibrator configured to calibrate the phases and the gains between the plurality of channels based on an output of the analog-to-digital converter,
wherein one of the plurality of channels is set as a reference channel, phases and gains of remaining channels other than the reference channel among the plurality of channels are sequentially optimized based on the reference channel, and a phase and a gain of the reference channel is optimized based on one of the remaining channels.