公开(公告)号：US20250138148A1

公开(公告)日：2025-05-01

申请号：US18499181

申请日：2023-10-31

Applicant: Texas Instruments Incorporated

Inventor： Karthik Subburaj ,  Piyush Soni ,  Vashishth Dudhia ,  Ryan Smith ,  Kavithaa Rajagopalan ,  Karthik Ramasubramanian ,  Shankar Ram Narayana Moorthy ,  Indu Prathapan ,  Samala Sreekiran

IPC: G01S7/40 ,  G01S13/32

Abstract: In described examples, a frequency modulated continuous wave (FMCW) radar includes a reference clock, a phase locked loop (PLL), a pulse generator, a counter, a chirp ramp control circuit, and a synchronization state machine. The reference clock generates a reference clock signal. The PLL generates a feedback clock signal in response to the reference clock signal, and an output signal in response to the feedback clock signal. The pulse generator outputs a chirp start pulse in response to the reference clock signal. The counter increments a count in response to the feedback clock signal. The synchronization state machine provides a chirp ramp signal to a chirp ramp control circuit in response to the reference clock signal, the feedback clock signal, the chirp start pulse, and the count. The chirp ramp control circuit causes the PLL to ramp a frequency of the output signal in response to the chirp ramp signal.

公开(公告)号：US11874392B2

公开(公告)日：2024-01-16

申请号：US17498342

申请日：2021-10-11

Applicant: Texas Instruments Incorporated

Inventor： Shankar Ram Narayana Moorthy ,  Karthik Subburaj ,  Shailesh Joshi ,  Piyush Soni

IPC: G01S7/28 ,  G01S7/35

CPC classification number: G01S7/2813 ,  G01S7/352

Abstract: A non-transitory computer-readable storage device stores machine instructions which, when executed by a processor, cause the processor to determine a chirp period Tc for radar chirps in a radar frame. The chirp period Tc comprises a rising period Trise and a falling period Tfall. The processor determines, for each radar chirp in the radar frame, a corresponding randomized frequency characteristic during Tfall, and causes a radar sensor circuit to generate the radar chirps in the radar frame based on Tc, Trise, Tfall, and the corresponding randomized frequency characteristics. In some implementations, the machine instructions to determine the corresponding randomized frequency characteristic comprise machine instructions to determine a frequency step having a frequency f_step and a period Tstep. At least one of the frequency f_step and the period Tstep is dithered across radar chirps in the radar frame.