公开(公告)号：US20050030092A1

公开(公告)日：2005-02-10

申请号：US10751670

申请日：2004-01-05

Applicant: Norbert Greitschus ,  Stefan Noe

Inventor： Norbert Greitschus ,  Stefan Noe

IPC: H03F3/30 ,  H03F3/45 ,  H03H11/12 ,  H03K5/00

CPC classification number: H03F3/3023 ,  H03F3/45188 ,  H03F2203/30123 ,  H03F2203/30138 ,  H03F2203/45308 ,  H03F2203/45648 ,  H03H11/126

Abstract: An at least second-order active filter circuit includes an operational amplifier (Op) whose frequency response, in conjunction with an RC network (R1, R2, C1, C2), serves to set a predetermined low-pass characteristic. The frequency response of the operational amplifier (Op) forms an integral part of this low-pass characteristic.

Abstract translation: 至少二阶有源滤波器电路包括运算放大器（Op），其运算放大器（Op）与RC网络（R1，R2，C1，C2）一起用于设定预定的低通特性。 运算放大器（Op）的频率响应构成了该低通特性的组成部分。

公开(公告)号：US07123083B2

公开(公告)日：2006-10-17

申请号：US10751670

申请日：2004-01-05

Applicant: Norbert Greitschus ,  Stefan Noe

Inventor： Norbert Greitschus ,  Stefan Noe

IPC: H03K5/00

CPC classification number: H03F3/3023 ,  H03F3/45188 ,  H03F2203/30123 ,  H03F2203/30138 ,  H03F2203/45308 ,  H03F2203/45648 ,  H03H11/126

Abstract: An at least second-order active filter circuit includes an operational amplifier (Op) whose frequency response, in conjunction with an RC network (R1, R2, C1, C2), serves to set a predetermined low-pass characteristic. The frequency response of the operational amplifier (Op) forms an integral part of this low-pass characteristic.

Abstract translation: 至少二阶有源滤波器电路包括运算放大器（Op），其运算放大器（Op），其频率响应与RC网络（R＆lt; 1＆gt;，＆lt; 2＆gt;，C＆lt; SUB > 1 C 2 2）用于设定预定的低通特性。 运算放大器（Op）的频率响应构成了该低通特性的组成部分。

公开(公告)号：US6046634A

公开(公告)日：2000-04-04

申请号：US160687

申请日：1998-09-25

Applicant: Jun Makino

Inventor： Jun Makino

IPC: H03F1/32 ,  H03F3/181 ,  H03F3/30 ,  H03F3/45 ,  H03G3/00 ,  H03F3/00

CPC classification number: H03F3/45381 ,  H03F3/3016 ,  H03F3/3061 ,  H03F2203/30057 ,  H03F2203/30078 ,  H03F2203/30091 ,  H03F2203/30111 ,  H03F2203/30123 ,  H03F2203/45371 ,  H03F2203/45374 ,  H03F2203/45702

Abstract: The present amplifier circuit employing floating error-cancellation technique eradicates errors and distortions by canceling them out at the speaker terminal. The circuit utilizes reference, main power, and error suspension amplifiers. The reference amplifier is a small signal amplifier with unity or near unity gain. The main function of the buffer amplifier is to provide a reference signal to be used to isolate the error signal. The main power amplifier is an inverting power amplifier without negative feedback, and whose main function is amplify the audio signal. The error suspension amplifier is a non-inverting power amplifier whose function is amplify the isolated error signal and provide an error potential to a speaker terminal so that the error can be canceled out at the speaker load.

Abstract translation: 使用浮动误差消除技术的本放大器电路通过在扬声器端子处取消它们来消除误差和失真。 该电路使用参考，主电源和错误悬挂放大器。 参考放大器是具有统一或接近单位增益的小信号放大器。 缓冲放大器的主要功能是提供用于隔离误差信号的参考信号。 主功率放大器是没有负反馈的反相功率放大器，其主要功能是放大音频信号。 误差悬挂放大器是同相功率放大器，其功能是放大隔离的误差信号，并向扬声器端子提供误差电位，从而可以在扬声器负载下抵消误差。

公开(公告)号：US09467107B2

公开(公告)日：2016-10-11

申请号：US14203461

申请日：2014-03-10

Applicant: Freescale Semiconductor, Inc.

Inventor： Ricardo P. Coimbra ,  Edevaldo Pereira Silva, Jr. ,  Andre L. Couto

IPC: H03F3/45 ,  H03F1/42 ,  H03F3/30 ,  H03F3/50

CPC classification number: H03F3/3016 ,  H03F3/4521 ,  H03F3/505 ,  H03F2200/513 ,  H03F2200/69 ,  H03F2203/30091 ,  H03F2203/30123 ,  H03F2203/45274

Abstract: In some embodiments, a source follower circuit may include a first level shifter configured to receive an input voltage; an N-type Metal-Oxide-Semiconductor (NMOS) transistor having a gate terminal coupled to an output of the first level shifter; a second level shifter configured to receive the input voltage; a P-type Metal-Oxide-Semiconductor (PMOS) transistor having a gate terminal coupled to an output of the second level shifter and a source terminal coupled to a source terminal of the NMOS transistor; and an amplifier configured to receive the input voltage and to output a current at a node between the source terminal of the NMOS transistor and the source terminal of the PMOS transistor, wherein the current is determined based upon a difference between the input voltage and a reference voltage.

Abstract translation: 在一些实施例中，源跟随器电路可以包括被配置为接收输入电压的第一电平移位器; N型金属氧化物半导体（NMOS）晶体管，其具有耦合到所述第一电平移位器的输出的栅极端子; 配置为接收所述输入电压的第二电平移位器; 具有耦合到第二电平移位器的输出的栅极端子和耦合到NMOS晶体管的源极端子的源极的P型金属氧化物半导体（PMOS）晶体管; 以及放大器，被配置为接收所述输入电压并且在所述NMOS晶体管的源极端子和所述PMOS晶体管的源极端子之间的节点处输出电流，其中所述电流基于所述输入电压和参考值之间的差异来确定 电压。

公开(公告)号：US20150256135A1

公开(公告)日：2015-09-10

申请号：US14203461

申请日：2014-03-10

Applicant: Freescale Semiconductor, Inc.

Inventor： Ricardo P. Coimbra ,  Edevaldo Pereira Silva, JR. ,  Andre L. Couto

IPC: H03F1/42 ,  H03F3/45

CPC classification number: H03F3/3016 ,  H03F3/4521 ,  H03F3/505 ,  H03F2200/513 ,  H03F2200/69 ,  H03F2203/30091 ,  H03F2203/30123 ,  H03F2203/45274

Abstract: Rail-to-rail follower circuits. In some embodiments, a source follower circuit may include a first level shifter configured to receive an input voltage; an N-type Metal-Oxide-Semiconductor (NMOS) transistor having a gate terminal coupled to an output of the first level shifter; a second level shifter configured to receive the input voltage; a P-type Metal-Oxide-Semiconductor (PMOS) transistor having a gate terminal coupled to an output of the second level shifter and a source terminal coupled to a source terminal of the NMOS transistor; and an amplifier configured to receive the input voltage and to output a current at a node between the source terminal of the NMOS transistor and the source terminal of the PMOS transistor, wherein the current is determined based upon a difference between the input voltage and a reference voltage.

Abstract translation: 轨到轨跟随器电路。 在一些实施例中，源跟随器电路可以包括被配置为接收输入电压的第一电平移位器; N型金属氧化物半导体（NMOS）晶体管，其具有耦合到所述第一电平移位器的输出的栅极端子; 配置为接收所述输入电压的第二电平移位器; 具有耦合到第二电平移位器的输出的栅极端子和耦合到NMOS晶体管的源极端子的源极的P型金属氧化物半导体（PMOS）晶体管; 以及放大器，被配置为接收所述输入电压并且在所述NMOS晶体管的源极端子和所述PMOS晶体管的源极端子之间的节点处输出电流，其中所述电流基于所述输入电压和参考值之间的差异来确定 电压。