US 12,455,349 B2
Estimating and compensating for crystal oscillator differences in a multi-crystal-oscillator radar
Karthik Subburaj, Bangalore (IN); Sandeep Rao, Bangalore (IN); and Karthik Ramasubramanian, Bangalore (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Sep. 28, 2023, as Appl. No. 18/476,965.
Claims priority of application No. 202341050665 (IN), filed on Jul. 27, 2023.
Prior Publication US 2025/0035744 A1, Jan. 30, 2025
Int. Cl. G01S 7/40 (2006.01); G01S 7/35 (2006.01); G01S 13/931 (2020.01)
CPC G01S 7/4021 (2013.01) [G01S 7/356 (2021.05); G01S 13/931 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus, comprising:
a first oscillator;
a receiver circuit configured to receive a first signal having a first frequency, wherein the receiver circuit includes:
a clock circuit coupled to the first oscillator and configured to provide a local oscillator signal that has a second frequency based on the first frequency and a target offset;
a mixer coupled to receive the local oscillator signal and the first signal;
a filter coupled to the mixer and configured to provide an intermediate frequency signal based on the local oscillator signal and the first signal;
an analog-to-digital converter coupled to the filter and configured to provide a digitized intermediate frequency signal based on the intermediate frequency signal; and
a digital front end coupled to the analog-to-digital converter configured to:
determine an intermediate frequency associated with the digitized intermediate frequency signal; and
determine a variance between the first oscillator and a second oscillator based on a comparison of the intermediate frequency to the target offset.