The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 28, 2023
Filed:
Jan. 15, 2021
Apple Inc., Cupertino, CA (US);
Jochen Schrattenecker, Alberndorf in der Riedmark, AT;
Bernhard Sogl, Unterhaching, DE;
Andreas Menkhoff, Oberhaching, DE;
Joonhoi Hur, Sunnyvale, CA (US);
Harald Pretl, Schwertberg, AT;
Christian Mayer, Wilhering, AT;
Andreas Langer, Unterschleissheim, DE;
Rastislav Vazny, Saratoga, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
An electronic device may include radar circuitry. Control circuitry may calibrate the radar circuitry using a multi-tone calibration signal. A first mixer may upconvert the calibration signal for transmission by a transmit antenna. A de-chirp mixer may mix the calibration signal output by the first mixer with the calibration signal as received by a receive antenna or loopback path to produce a baseband multi-tone calibration signal. The baseband signal will be offset from DC by the frequency gap. This may prevent DC noise or other system effects from interfering with the calibration signal. The control circuitry may sweep the first mixer over the radio frequencies of operation of the radar circuitry to estimate the power droop and phase shift of the radar circuitry based on baseband calibration signal. Distortion circuitry may distort transmit signals used in spatial ranging operations to invert the estimated power droop and phase shift.