公开(公告)号：US11249130B2

公开(公告)日：2022-02-15

申请号：US15859244

申请日：2017-12-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yuguo Wang ,  Steven Loveless ,  Tathagata Chatterjee ,  Jerry Doorenbos

IPC: G01R31/26

Abstract: A system comprises a noise generator circuit and a noise envelope detector circuit. The noise generator circuit comprises a first amplifier including a single transistor pair that is operable to generate 1/f noise, an output amplifier coupled to the first amplifier and configured to generate a 1/f noise signal as a function of the 1/f noise. The noise envelope detector circuit comprises a low pass filter operable to pass low frequency signals of the 1/f noise signal as a filtered 1/f noise signal, and a second amplifier or a comparator coupled to the low pass filter and operable to output a direct current (DC) voltage signal according to an envelope of the filtered 1/f noise signal, where the DC voltage signal is a function of an envelope of the filtered 1/f noise signal.

公开(公告)号：US20220082608A1

公开(公告)日：2022-03-17

申请号：US17537007

申请日：2021-11-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yuguo Wang ,  Steven Loveless ,  Tathagata Chatterjee ,  Jerry Doorenbos

IPC: G01R31/26

Abstract: A system comprises a noise generator circuit and a noise envelope detector circuit. The noise generator circuit comprises a first amplifier including a single transistor pair that is operable to generate 1/f noise, an output amplifier coupled to the first amplifier and configured to generate a 1/f noise signal as a function of the 1/f noise. The noise envelope detector circuit comprises a low pass filter operable to pass low frequency signals of the 1/f noise signal as a filtered 1/f noise signal, and a second amplifier or a comparator coupled to the low pass filter and operable to output a direct current (DC) voltage signal according to an envelope of the filtered 1/f noise signal, where the DC voltage signal is a function of an envelope of the filtered 1/f noise signal.

公开(公告)号：US20240103558A1

公开(公告)日：2024-03-28

申请号：US17950276

申请日：2022-09-22

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Sudheer Gangula ,  Jerry Doorenbos ,  Dimitar Trifonov

IPC: G05F3/26

CPC classification number: G05F3/265

Abstract: Examples of bandgap circuits and elements thereof enable generation of an accurate and stable bandgap reference voltage that is not affected by low current gain. An example circuit includes first and second input transistors, each having an emitter to receive a tail current; first and second core transistors, a collector of each coupled to ground; a first lower leg coupled between a first upper leg and the emitter of the first core transistor at a first current input coupled to the base of the first input transistor; a second lower leg coupled between a second upper leg and the emitter of the second core transistor at a second current input coupled to the base of the second input transistor; and a base resistor coupled between the base and collector of the first core transistor. The input transistor pair has a current density ratio that is the same as that of the core transistor pair.

公开(公告)号：US20230353100A1

公开(公告)日：2023-11-02

申请号：US17732385

申请日：2022-04-28

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Vivek Varier ,  Srinivas Pulijala ,  Vadim Ivanov ,  Jerry Doorenbos

IPC: H03F3/16 ,  H03F1/30

CPC classification number: H03F1/301 ,  H03F3/16 ,  H03F2200/447

Abstract: An example apparatus includes: An amplifier comprising folded cascode circuitry having an input and an output, an input pair coupled to the input, clamp circuitry including: a first transistor having a first drain, a first source, and a first gate, the first source coupled to the output, a second transistor having a second drain, a second source, and a second gate, the second drain coupled to the first drain and the second gate coupled to the first drain and second drain, a third transistor having a third drain, a third source, and a third gate, the third source coupled to the output, and a fourth transistor having a fourth drain, a fourth source, and a fourth gate, the fourth drain coupled to the third drain and the fourth gate coupled to the third drain and the fourth drain.

公开(公告)号：US11796588B2

公开(公告)日：2023-10-24

申请号：US17537007

申请日：2021-11-29

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Yuguo Wang ,  Steven Loveless ,  Tathagata Chatterjee ,  Jerry Doorenbos

IPC: G01R31/26

CPC classification number: G01R31/2626

Abstract: A system comprises a noise generator circuit and a noise envelope detector circuit. The noise generator circuit comprises a first amplifier including a single transistor pair that is operable to generate 1/f noise, an output amplifier coupled to the first amplifier and configured to generate a 1/f noise signal as a function of the 1/f noise. The noise envelope detector circuit comprises a low pass filter operable to pass low frequency signals of the 1/f noise signal as a filtered 1/f noise signal, and a second amplifier or a comparator coupled to the low pass filter and operable to output a direct current (DC) voltage signal according to an envelope of the filtered 1/f noise signal, where the DC voltage signal is a function of an envelope of the filtered 1/f noise signal.