公开(公告)号：US20240280634A1

公开(公告)日：2024-08-22

申请号：US18171951

申请日：2023-02-21

Applicant: Texas Instruments Incorporated

Inventor： Brett Forejt ,  Hansheng Wang ,  Noah Robb

IPC: G01R31/317

CPC classification number: G01R31/31727

Abstract: Low-frequency oscillator (LFO) monitoring circuits and methods. An example of an LFO monitoring circuit includes a resistor having first and second resistor terminals with the first resistor terminal coupled to a ground terminal, first and second transistors coupled between a supply voltage terminal and the second resistor terminal, the first transistor having a first control terminal and the second transistor having a second control terminal, a ramp generator having first and second outputs coupled to the first and second control terminals, respectively, and first and second inputs configured to receive, respectively, first and second signals representative of a frequency of a low-frequency oscillator, the ramp generator being configured to provide, at the first output, a first ramp signal based on the first signal and, at the second output, a second ramp signal based on the second signal, and a comparator having a comparator input coupled to the second resistor terminal.

公开(公告)号：US12298345B2

公开(公告)日：2025-05-13

申请号：US18171951

申请日：2023-02-21

Applicant: Texas Instruments Incorporated

Inventor： Brett Forejt ,  Hansheng Wang ,  Noah Robb

IPC: G01R31/317

Abstract: Low-frequency oscillator (LFO) monitoring circuits and methods. An example of an LFO monitoring circuit includes a resistor having first and second resistor terminals with the first resistor terminal coupled to a ground terminal, first and second transistors coupled between a supply voltage terminal and the second resistor terminal, the first transistor having a first control terminal and the second transistor having a second control terminal, a ramp generator having first and second outputs coupled to the first and second control terminals, respectively, and first and second inputs configured to receive, respectively, first and second signals representative of a frequency of a low-frequency oscillator, the ramp generator being configured to provide, at the first output, a first ramp signal based on the first signal and, at the second output, a second ramp signal based on the second signal, and a comparator having a comparator input coupled to the second resistor terminal.