公开(公告)号：US08766722B2

公开(公告)日：2014-07-01

申请号：US13655339

申请日：2012-10-18

Applicant: Broadcom Corporation

Inventor： Sherif Galal ,  Alex Jianzhong Chen ,  Khaled Abdelfattah ,  Todd L. Brooks

IPC: H03F3/26

CPC classification number: H03F3/211 ,  H03F1/301 ,  H03F3/3022 ,  H03F2200/375 ,  H03F2200/453 ,  H03F2203/30015

Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.

Abstract translation: 公开了一种AB-B类放大器，其包括包括第一多个放大装置的第一输出级和包括第二多个放大装置的第二输出级。 根据一个实施例，当AB类/ B放大器处于静态时，第一输出级工作，而当AB类/ B放大器处于活动状态时，第二输出级工作。 AB类/ B放大器还包括一个电平移动电路，其调节第二输出级的控制电压，其中当AB类/ B放大器进入激活状态时，电平移位电路用于激活第二输出级。 AB类/ B放大器的实施例可以包括实现固定或信号相关电平移位的电平移位电路和基本上消除由复制偏置电路内部的有源反馈电路产生的任何系统偏移的静态控制电路。

公开(公告)号：US08665023B2

公开(公告)日：2014-03-04

申请号：US13655362

申请日：2012-10-18

Applicant: Broadcom Corporation

Inventor： Sherif Galal ,  Alex Jianzhong Chen ,  Khaled Abdelfattah ,  Todd L. Brooks

IPC: H03F3/26

CPC classification number: H03F3/211 ,  H03F1/301 ,  H03F3/3022 ,  H03F2200/375 ,  H03F2200/453 ,  H03F2203/30015

Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.

Abstract translation: 公开了一种AB-B类放大器，其包括包括第一多个放大装置的第一输出级和包括第二多个放大装置的第二输出级。 根据一个实施例，当AB类/ B放大器处于静态时，第一输出级工作，而当AB类/ B放大器处于活动状态时，第二输出级工作。 AB类/ B放大器还包括一个电平移动电路，其调节第二输出级的控制电压，其中当AB类/ B放大器进入激活状态时，电平移位电路用于激活第二输出级。 AB类/ B放大器的实施例可以包括实现固定或信号相关电平移位的电平移位电路和基本上消除由复制偏置电路内部的有源反馈电路产生的任何系统偏移的静态控制电路。

公开(公告)号：US20130064398A1

公开(公告)日：2013-03-14

申请号：US13655362

申请日：2012-10-18

Applicant: Broadcom Corporation

Inventor： Sherif Galal ,  Alex Jianzhong Chen ,  Khaled Abdelfattah ,  Todd L. Brooks

IPC: H03F3/16 ,  H03F99/00 ,  H03F1/38

CPC classification number: H03F3/211 ,  H03F1/301 ,  H03F3/3022 ,  H03F2200/375 ,  H03F2200/453 ,  H03F2203/30015

Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.

Abstract translation: 公开了一种AB-B类放大器，其包括包括第一多个放大装置的第一输出级和包括第二多个放大装置的第二输出级。 根据一个实施例，当AB类/ B放大器处于静态时，第一输出级工作，而当AB类/ B放大器处于活动状态时，第二输出级工作。 AB类/ B放大器还包括一个电平移动电路，其调节第二输出级的控制电压，其中当AB类/ B放大器进入激活状态时，电平移位电路用于激活第二输出级。 AB类/ B放大器的实施例可以包括实现固定或信号相关电平移位的电平移位电路和基本上消除由复制偏置电路内部的有源反馈电路产生的任何系统偏移的静态控制电路。

公开(公告)号：US20130063214A1

公开(公告)日：2013-03-14

申请号：US13655339

申请日：2012-10-18

Applicant: Broadcom Corporation

Inventor： Sherif Galal ,  Alex Jianzhong Chen ,  Khaled Abdelfattah ,  Todd L. Brooks

IPC: H03F1/38

CPC classification number: H03F3/211 ,  H03F1/301 ,  H03F3/3022 ,  H03F2200/375 ,  H03F2200/453 ,  H03F2203/30015

Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.

Abstract translation: 公开了一种AB-B类放大器，其包括包括第一多个放大装置的第一输出级和包括第二多个放大装置的第二输出级。 根据一个实施例，当AB类/ B放大器处于静态时，第一输出级工作，而当AB类/ B放大器处于活动状态时，第二输出级工作。 AB类/ B放大器还包括一个电平移动电路，其调节第二输出级的控制电压，其中当AB类/ B放大器进入激活状态时，电平移位电路用于激活第二输出级。 AB类/ B放大器的实施例可以包括实现固定或信号相关电平移位的电平移位电路和基本上消除由复制偏置电路内部的有源反馈电路产生的任何系统偏移的静态控制电路。