公开(公告)号：US20220326044A1

公开(公告)日：2022-10-13

申请号：US17654057

申请日：2022-03-08

Applicant: NXP USA, INC.

Inventor： Raghavendra N. Sridhar ,  Gerhard Trauth ,  Keith L. Kraver ,  Sung Jin Jo

IPC: G01C25/00 ,  G01C19/5762 ,  G01C19/5726 ,  H04L27/12 ,  B81B7/02

Abstract: An oscillator drive circuit and a trim circuit are implemented inside an integrated circuit of a sensor. The drive circuit provides an oscillating drive signal at a resonant frequency to drive a movable mass of the sensor. The drive circuit includes a phase shift circuit having an input for receiving a first signal indicative of an oscillation of the movable mass and having an output. The phase shift circuit adds a phase shift component to the first signal and produces a second signal shifted in phase by the phase shift component. The trim circuit includes a first comparator for receiving the first signal, a second comparator for receiving the second signal, and a processing element. The processing element determines a phase lag between the first and second signals and produces trim code for use by the phase shift circuit, the trim code being configured to adjust the phase shift component.

公开(公告)号：US20250109967A1

公开(公告)日：2025-04-03

申请号：US18979458

申请日：2024-12-12

Applicant: NXP USA, INC.

Inventor： Raghavendra N Sridhar ,  Gerhard Trauth ,  Keith L. Kraver ,  Sung Jin Jo

IPC: G01C25/00 ,  B81B7/02 ,  G01C19/5726 ,  G01C19/5762 ,  H04L27/12

Abstract: An oscillator drive circuit and a trim circuit are implemented inside an integrated circuit of a sensor. The drive circuit provides an oscillating drive signal at a resonant frequency to drive a movable mass of the sensor. The drive circuit includes a phase shift circuit having an input for receiving a first signal indicative of an oscillation of the movable mass and having an output. The phase shift circuit adds a phase shift component to the first signal and produces a second signal shifted in phase by the phase shift component. The trim circuit includes a first comparator for receiving the first signal, a second comparator for receiving the second signal, and a processing element. The processing element determines a phase lag between the first and second signals and produces trim code for use by the phase shift circuit, the trim code being configured to adjust the phase shift component.

公开(公告)号：US12203774B2

公开(公告)日：2025-01-21

申请号：US17654057

申请日：2022-03-08

Applicant: NXP USA, INC.

Inventor： Raghavendra N Sridhar ,  Gerhard Trauth ,  Keith L. Kraver ,  Sung Jin Jo

IPC: G01C25/00 ,  B81B7/02 ,  G01C19/5726 ,  G01C19/5762 ,  H04L27/12

Abstract: An oscillator drive circuit and a trim circuit are implemented inside an integrated circuit of a sensor. The drive circuit provides an oscillating drive signal at a resonant frequency to drive a movable mass of the sensor. The drive circuit includes a phase shift circuit having an input for receiving a first signal indicative of an oscillation of the movable mass and having an output. The phase shift circuit adds a phase shift component to the first signal and produces a second signal shifted in phase by the phase shift component. The trim circuit includes a first comparator for receiving the first signal, a second comparator for receiving the second signal, and a processing element. The processing element determines a phase lag between the first and second signals and produces trim code for use by the phase shift circuit, the trim code being configured to adjust the phase shift component.