公开(公告)号：US09287839B1

公开(公告)日：2016-03-15

申请号：US14056108

申请日：2013-10-17

Applicant: Cirrus Logic, Inc.

Inventor： Christophe Jean-Francois Amadi ,  Jason Lee Wardlaw ,  Emmanuel A. Marchais ,  Dylan Alexander Hester ,  Daniel John Allen ,  John Christopher Tucker

IPC: H03F3/45 ,  H03F1/34 ,  H03F1/02 ,  H03G3/32

CPC classification number: H03F3/45659 ,  H03F1/02 ,  H03F1/26 ,  H03F1/34 ,  H03F3/187 ,  H03F3/45475 ,  H03F3/45753 ,  H03F2200/03 ,  H03F2203/45138 ,  H03F2203/45212 ,  H03F2203/45526 ,  H03F2203/45586 ,  H03G3/32

Abstract: A DC servo loop may track DC offset changes of an input signal and apply feedback to amplifiers to adjust a DC offset of the input signal. The DC servo loop may include digital loop tracking and analog loop tracking components. The digital loop tracking components may track small changes in the DC offset. When the DC offset exceeds a certain threshold, analog loop tracking may be activated to apply feedback to the amplifiers to adjust the DC offset. The adjustments to the DC offset may be delayed until an amplitude of the input signal exceeds a threshold to reduce contribution to noise in the input signal.

Abstract translation: DC伺服环路可以跟踪输入信号的DC偏移变化，并将反馈应用于放大器以调整输入信号的直流偏移。 DC伺服环路可以包括数字环路跟踪和模拟环路跟踪组件。 数字环路跟踪组件可以跟踪DC偏移的小变化。 当DC偏移超过某个阈值时，可以激活模拟环路跟踪以将反馈应用于放大器以调整DC偏移。 DC偏移的调整可能被延迟，直到输入信号的幅度超过阈值以减小输入信号中对噪声的贡献。

公开(公告)号：US09191001B2

公开(公告)日：2015-11-17

申请号：US14137073

申请日：2013-12-20

Applicant: Cirrus Logic, Inc.

Inventor： Christophe Jean-Francois Amadi

IPC: H03K19/003 ,  H03K5/003 ,  H03K19/20 ,  H03K19/0185

CPC classification number: H03K19/00315 ,  H03K3/356182 ,  H03K5/003 ,  H03K19/018507 ,  H03K19/20

Abstract: A voltage selector circuit may be coupled to transistors to protect one or more inputs of the transistor from exceeding a safe operating range. In one example, a cross-coupled pair of transistors may be coupled to a gate of a transistor to select between a first voltage and a cascoded voltage that is a safe bias voltage. Thus, the transistor may be protected from unsafe gate-to-source voltages. The voltage selector may be used to build circuits, such as invertors, level shifter, NAND gates, and NOR gates, that function with power supply voltages that may exceed the safe operating range of the transistors.

Abstract translation: 电压选择器电路可以耦合到晶体管以保护晶体管的一个或多个输入不超过安全工作范围。 在一个示例中，交叉耦合的晶体管对可以耦合到晶体管的栅极，以在第一电压和作为安全偏置电压的级联电压之间进行选择。 因此，可以保护晶体管不受不安全的栅极至源极电压的影响。 电压选择器可用于构建诸如反相器，电平移位器，非门和或非门的电路，其功率可以超过晶体管的安全工作范围的电源电压。

公开(公告)号：US20150180473A1

公开(公告)日：2015-06-25

申请号：US14137073

申请日：2013-12-20

Applicant: Cirrus Logic, Inc.

Inventor： Christophe Jean-Francois Amadi

IPC: H03K19/003 ,  H03K5/003

CPC classification number: H03K19/00315 ,  H03K3/356182 ,  H03K5/003 ,  H03K19/018507 ,  H03K19/20

Abstract: A voltage selector circuit may be coupled to transistors to protect one or more inputs of the transistor from exceeding a safe operating range. In one example, a cross-coupled pair of transistors may be coupled to a gate of a transistor to select between a first voltage and a cascoded voltage that is a safe bias voltage. Thus, the transistor may be protected from unsafe gate-to-source voltages. The voltage selector may be used to build circuits, such as invertors, level shifter, NAND gates, and NOR gates, that function with power supply voltages that may exceed the safe operating range of the transistors.

Abstract translation: 电压选择器电路可以耦合到晶体管以保护晶体管的一个或多个输入不超过安全工作范围。 在一个示例中，交叉耦合的晶体管对可以耦合到晶体管的栅极，以在第一电压和作为安全偏置电压的级联电压之间进行选择。 因此，可以保护晶体管不受不安全的栅极至源极电压的影响。 电压选择器可用于构建诸如反相器，电平移位器，非门和或非门的电路，其功率可以超过晶体管的安全工作范围的电源电压。