US 12,235,384 B2
End-of line phase calibration of radar devices
Josef Kulmer, Graz (AT); Patrick Hoelzl, Amstetten (AT); and Hao Li, Poing (DE)
Assigned to Infineon Technologies AG, Neubiberg (DE)
Filed by Infineon Technologies AG, Neubiberg (DE)
Filed on Feb. 16, 2022, as Appl. No. 17/651,331.
Claims priority of application No. 102021106428.7 (DE), filed on Mar. 16, 2021.
Prior Publication US 2022/0334218 A1, Oct. 20, 2022
Int. Cl. G01S 7/40 (2006.01); G01S 13/58 (2006.01)
CPC G01S 7/40 (2013.01) [G01S 13/584 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method comprising:
providing a local oscillator signal to a transmit channel of a radar chip, the transmit channel generating a radio frequency (RF) output signal based on the local oscillator signal;
providing an internal RF test signal which is generated by applying the local oscillator signal to the transmit channel;
determining a first phase value for a first value of an influence parameter of the radar chip and a second phase value for a second value of the influence parameter of the radar chip based on internal measurements of the first phase value and the second phase value, the internal measurements being based on the internal RF test signal and the local oscillator signal;
determining a third phase value for the first value of the influence parameter of the radar chip and a fourth phase value for the second value of the influence parameter of the radar chip based on the RF output signal;
calculating a calibration parameter based on the first phase value, the second phase value, the third phase value, and the fourth phase value; and
using, during operation of the radar chip, the calibration parameter to estimate a phase of the RF output signal.