公开(公告)号：US11368126B1

公开(公告)日：2022-06-21

申请号：US17444320

申请日：2021-08-03

Applicant: NXP B.V.

Inventor： Ricardo Pureza Coimbra ,  Stefano Pietri ,  Vitor Moreira Gomes ,  Eduardo Ribeiro da Silva

IPC: H03B5/36 ,  H02M3/158

Abstract: A first switch is operable to couple a start-up oscillator circuit to a first crystal pin during operation in a start-up mode and decouple the start-up oscillator circuit from the first crystal pin during operation in a normal mode, and a second switch is operable to couple the start-up oscillator circuit to a second crystal pin during operation in the start-up mode and decouple the start-up oscillator circuit from the second crystal pin during operation in the normal mode. A switched oscillator circuit is coupled to the startup oscillator during operation in the startup mode, and to the first and second crystal pins during operation in the start-up and normal modes. The switched oscillator circuit includes a sample and charge circuit which is configured to sample a direct current (DC) level of the first crystal pin and pre-charge a first coupling capacitor during operation in the startup mode.

公开(公告)号：US11251780B1

公开(公告)日：2022-02-15

申请号：US17302048

申请日：2021-04-22

Applicant: NXP B.V.

Inventor： Ricardo Pureza Coimbra ,  Vitor Moreira Gomes

IPC: H03K19/0185 ,  H03K3/037

Abstract: An integrated circuit device includes a level shifter circuit with a supply voltage rail to provide a supply voltage, a first pull-up circuit coupled between the supply voltage rail and a first node, a second pull-up circuit coupled between the supply voltage rail and a second node, a first switch including a first terminal coupled to the supply voltage rail, a second terminal coupled to the first node, and a control terminal coupled to the second node, and an inverter including an input terminal coupled to the first node, a voltage supply terminal coupled to the supply voltage, and an output terminal to provide an output voltage from the level shifter circuit.