公开(公告)号：US20230043133A1

公开(公告)日：2023-02-09

申请号：US17903128

申请日：2022-09-06

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Nitin Agarwal ,  Aniruddha Roy ,  Preetham Narayana Reddy

IPC: H03B5/06 ,  H03B5/12 ,  H03L5/00 ,  H03B5/36

Abstract: In an example, a system includes an oscillator circuit on a chip. The oscillator circuit includes a charging current generator including a current mirror and an amplifier, where the amplifier is coupled to a pin of the chip. The oscillator circuit also includes a first switch coupled to the pin, a second switch coupled to the pin and to a charging resistor, and a third switch coupled to the amplifier and an internal resistor, where the internal resistor is internal to the chip. The oscillator circuit includes a bias current source coupled to the current mirror. The system includes an external resistor coupled to the pin, where the external resistor is external to the chip. The system also includes an external capacitor coupled to the pin and coupled in parallel to the external resistor, where the external capacitor is external to the chip.

公开(公告)号：US11437955B1

公开(公告)日：2022-09-06

申请号：US17510032

申请日：2021-10-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Nitin Agarwal ,  Aniruddha Roy ,  Preetham Narayana Reddy

IPC: H03B5/06 ,  H03B5/12 ,  H03L5/00 ,  H03B5/36

Abstract: In an example, a system includes an oscillator circuit on a chip. The oscillator circuit includes a charging current generator including a current mirror and an amplifier, where the amplifier is coupled to a pin of the chip. The oscillator circuit also includes a first switch coupled to the pin, a second switch coupled to the pin and to a charging resistor, and a third switch coupled to the amplifier and an internal resistor, where the internal resistor is internal to the chip. The oscillator circuit includes a bias current source coupled to the current mirror. The system includes an external resistor coupled to the pin, where the external resistor is external to the chip. The system also includes an external capacitor coupled to the pin and coupled in parallel to the external resistor, where the external capacitor is external to the chip.

公开(公告)号：US11984849B2

公开(公告)日：2024-05-14

申请号：US17903128

申请日：2022-09-06

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Nitin Agarwal ,  Aniruddha Roy ,  Preetham Narayana Reddy

IPC: H03B5/06 ,  H03B5/12 ,  H03B5/36 ,  H03L5/00

CPC classification number: H03B5/06 ,  H03B5/1212 ,  H03B5/36 ,  H03L5/00

Abstract: In an example, a system includes an oscillator circuit on a chip. The oscillator circuit includes a charging current generator including a current mirror and an amplifier, where the amplifier is coupled to a pin of the chip. The oscillator circuit also includes a first switch coupled to the pin, a second switch coupled to the pin and to a charging resistor, and a third switch coupled to the amplifier and an internal resistor, where the internal resistor is internal to the chip. The oscillator circuit includes a bias current source coupled to the current mirror. The system includes an external resistor coupled to the pin, where the external resistor is external to the chip. The system also includes an external capacitor coupled to the pin and coupled in parallel to the external resistor, where the external capacitor is external to the chip.

公开(公告)号：US11848645B2

公开(公告)日：2023-12-19

申请号：US17509706

申请日：2021-10-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Nitin Agarwal ,  Aniruddha Roy ,  Preetham Narayana Reddy

IPC: H03K3/0231 ,  H03B5/20

CPC classification number: H03B5/20 ,  H03K3/0231 ,  H03B2200/0014 ,  H03B2200/0034 ,  H03B2200/0038

Abstract: In an example, a system includes an oscillator circuit on a chip. The oscillator circuit includes a charging current generator including a current mirror, an amplifier, and an on-chip resistor, where the on-chip resistor is coupled to a pin on the chip. The oscillator circuit also includes oscillator circuitry coupled to the charging current generator, where the oscillator circuitry includes a comparator, a phase generator, a first capacitor coupled to a first resistor, and a second capacitor coupled to a second resistor. The system also includes an external resistor coupled to the pin, where the external resistor is external to the chip. The system includes an external capacitor coupled to the pin, where the external capacitor is external to the chip.

公开(公告)号：US11796606B2

公开(公告)日：2023-10-24

申请号：US17509836

申请日：2021-10-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Aniruddha Roy ,  Nitin Agarwal ,  Preetham Narayana Reddy

IPC: G01R31/52 ,  H03B5/12 ,  H03K3/0231 ,  H03K4/502

CPC classification number: G01R31/52 ,  H03B5/1203 ,  H03K3/0231 ,  H03K4/502

Abstract: In an example, a system includes an oscillator circuit on a chip. The oscillator circuit includes a charging current generator including a current mirror and an amplifier, where the amplifier is coupled to a pin on the chip, and where the pin is adapted to be coupled to an external resistor, where the external resistor is external to the chip. The oscillator circuit also includes oscillator circuitry coupled to the charging current generator, where the oscillator circuitry includes a comparator, a phase generator, a first capacitor coupled to a first switch, and a second capacitor coupled to a second switch. The oscillator circuit includes leakage circuitry coupled to the current mirror, where the leakage circuitry is configured to draw a current from the current mirror proportional to a leakage current flowing through the external resistor from circuitry internal to the chip.