公开(公告)号：US10187012B1

公开(公告)日：2019-01-22

申请号：US15807640

申请日：2017-11-09

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bhuvanesh Radhakrishnan Kulasekaran

IPC: H03F3/45 ,  H03F1/02 ,  H03F3/30

Abstract: A class AB amplifier with improved DC gain. An amplifier includes an input stage and an output stage. The output stage is configured to amplify an output of the input stage. The output stage includes output transistors, class AB amplifier circuitry, minimum selector circuitry, and gain boost amplifier circuitry. The class AB amplifier circuitry includes a first transistor and a second transistor connected as a differential amplifier. The minimum selector circuitry is configured to control bias current in the output transistors by driving a control input of the first transistor. The gain boost amplifier circuitry is coupled to the class AB amplifier circuitry. The gain boost amplifier circuitry is configured to drive a common mode signal onto the control input of the first transistor and a control input of the second transistor, the common mode signal based on the output of the input stage.

公开(公告)号：US11183976B2

公开(公告)日：2021-11-23

申请号：US16708660

申请日：2019-12-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Steven Graham Brantley ,  Munaf Hussain Shaik ,  Bhuvanesh Radhakrishnan Kulasekaran

IPC: H03F1/22 ,  H03F1/34 ,  H03F3/213

Abstract: An amplifier circuit includes a high-voltage output stage. The high-voltage output stage includes an output terminal, a high-side output circuit, a low-side output circuit, and a feedback circuit. The high-side output circuit sources current to the output terminal, and includes a high-side input transistor, a first high-side cascode transistor coupled to the high-side input transistor, and a second high-side cascode transistor coupled to the first high-side cascode transistor and the output terminal. The low-side output circuit sinks current from the output terminal, and includes a low-side input transistor, a first low-side cascode transistor coupled to the low-side input transistor, and a second low-side cascode transistor coupled to the first low-side cascode transistor and the output terminal. The feedback circuit is configured to bias the second high-side cascode transistor and the second low-side cascode transistor based on a sense voltage generated by the high-side output circuit or the low-side output circuit.

公开(公告)号：US10566933B2

公开(公告)日：2020-02-18

申请号：US16218686

申请日：2018-12-13

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bhuvanesh Radhakrishnan Kulasekaran

IPC: H03F3/45 ,  H03F1/02 ,  H03F3/30

Abstract: A class AB amplifier with improved DC gain. An amplifier includes an input stage and an output stage. The output stage is configured to amplify an output of the input stage. The output stage includes output transistors, class AB amplifier circuitry, minimum selector circuitry, and gain boost amplifier circuitry. The class AB amplifier circuitry includes a first transistor and a second transistor connected as a differential amplifier. The minimum selector circuitry is configured to control bias current in the output transistors by driving a control input of the first transistor. The gain boost amplifier circuitry is coupled to the class AB amplifier circuitry. The gain boost amplifier circuitry is configured to drive a common mode signal onto the control input of the first transistor and a control input of the second transistor, the common mode signal based on the output of the input stage.