公开(公告)号：US5710522A

公开(公告)日：1998-01-20

申请号：US679833

申请日：1996-07-15

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： H03F3/345 ,  H03F1/34

CPC分类号： H03F3/345

摘要： The present invention is a single-ended Class A gain stage amplifier consisting of an active current source. A feedback path from an output node of the amplifier senses the direction and magnitude of the current going through a load coupled to the output node. The feedback path varies the output of the active current source in accordance with the sensed load current. By so doing, the efficiency of the amplifier of the present invention can be doubled as compared to prior art amplifiers operating in Class A mode. In addition, the present invention amplifier exhibits lower signal distortion.

摘要翻译： 本发明是由有源电流源组成的单端A类增益级放大器。 来自放大器的输出节点的反馈路径感测通过耦合到输出节点的负载的电流的方向和幅度。 反馈路径根据感测的负载电流改变有源电流源的输出。 通过这样做，与以A类模式工作的现有技术的放大器相比，本发明的放大器的效率可以增加一倍。 此外，本发明的放大器表现出较低的信号失真。

公开(公告)号：US5343166A

公开(公告)日：1994-08-30

申请号：US112430

申请日：1993-08-26

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： H03F1/02 ,  H03F3/50 ,  H03F3/26

CPC分类号： H03F1/0244 ,  H03F3/505

摘要： A power amplifier circuit having a cascode transistor configuration with at least one gain transistor biased for Class-A or Class-AB operation and at least one cascode transistor, and having at least one isolated high impedance current source connected across the gain transistor(s) to provide an alternate path for bias current other than through the cascode transistor(s). In a complementary symmetry embodiment of the amplifier, a bias voltage across the gates of the complementary gain transistors ensures Class-A (or -AB) operation, while either a single current source connected across both gain transistors or a pair of current sources, each connected across one gain transistor, provides the alternate bias current path. In a single-ended embodiment of the amplifier, a current sink to one of the power supply terminals assures forward bias for Class-A (or -AB) operation, and a single current source is connected across the sole gain transistor. The cascode configuration can employ either a common drain or a common source connection for the gain transistor(s). The current source(s) reduce bias current through the cascode transistor(s) and thereby reduce power dissipation as the cascode transistor(s) holds the voltage drop across the gain transistor(s) relatively constant.

摘要翻译： 一种具有级联晶体管配置的功率放大器电路，其具有用于A类或AB类操作的至少一个增益晶体管和至少一个共源共栅晶体管，并且具有连接在所述增益晶体管两端的至少一个隔离的高阻抗电流源， 以提供除通过共源共栅晶体管之外的偏置电流的替代路径。 在放大器的互补对称实施例中，互补增益晶体管的栅极两端的偏置电压确保了A类（或-AB）工作，而在两个增益晶体管或一对电流源两端连接的单个电流源 连接在一个增益晶体管上，提供交替的偏置电流路径。 在放大器的单端实施例中，对一个电源端子的电流吸收器确保A类（或-AB）操作的正向偏置，并且单个电流源连接在唯一增益晶体管两端。 共源共栅配置可以采用公共漏极或用于增益晶体管的公共源极连接。 电流源减少通过共源共栅晶体管的偏置电流，从而降低功率耗散，因为共源共栅晶体管保持增益晶体管两端的电压降相对恒定。

公开(公告)号：US4899387A

公开(公告)日：1990-02-06

申请号：US279406

申请日：1988-12-02

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： G10K11/178

CPC分类号： G10K11/1788 ,  G10K2210/12 ,  G10K2210/3011 ,  G10K2210/3013 ,  G10K2210/3217 ,  G10K2210/3227 ,  G10K2210/32271 ,  G10K2210/505

摘要： An electrically active sound wave attenuation apparatus mounted in an upright, free-standing housing for eliminating unwanted reflected waves in a room. The housing is intended to be placed in a location where undesired wave patterns, such as standing waves, are formed in order to offset or cancel such conditions. These conditions are offset by generating an acoustic signal which is the inverse of pressure waves at a particular location. The pressure waves are sensed by a module, including a microphone which generates a corresponding electrical signal. This signal is sent to an electrical circuit where an inverse signal is created which is then transmitted to a loudspeaker. The loudspeaker output is directed toward the location where the standing waves would be formed. The loudspeaker output nulls local acoustic waves so that no standing waves are formed. The housing may incorporate two acoustically isolated modules with resonance attenuating qualities, one at each end of the structure.

摘要翻译： 一种安装在直立的独立式外壳中的电活性声波衰减装置，用于消除房间中不需要的反射波。 外壳旨在放置在形成不期望的波形（例如驻波）以便抵消或取消这种条件的位置。 这些条件通过产生与特定位置处的压力波的相反的声信号来抵消。 压力波由模块感测，包括产生相应电信号的麦克风。 该信号被发送到产生反向信号的电路，然后发送到扬声器。 扬声器输出指向将形成驻波的位置。 扬声器输出使局部声波无效，从而不形成驻波。 外壳可以结合两个具有共振衰减特性的声隔离模块，一个在结构的两端。

公开(公告)号：US4752745A

公开(公告)日：1988-06-21

申请号：US86932

申请日：1987-08-18

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： H03F3/08 ,  H03F3/30 ,  H03F3/26

CPC分类号： H03F3/3072 ,  H03F3/08

摘要： A high fidelity audio amplifier of the push-pull complementary symmetry type, featuring a feedback circuit with a bias sensing element connected to the output terminals of the output transistors. The feedback circuit includes a photoemitting element in optical communication with a photoconductive element which determines the relative voltage difference of the input terminals of the complementary symmetry output transistors.

摘要翻译： 具有推挽互补对称型的高保真音频放大器，其特征在于具有连接到输出晶体管的输出端的偏置感测元件的反馈电路。 反馈电路包括与光电导元件光通信的光发射元件，其确定互补对称输出晶体管的输入端子的相对电压差。

公开(公告)号：US4107619A

公开(公告)日：1978-08-15

申请号：US862406

申请日：1977-12-20

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： H03F3/183 ,  H03F1/22 ,  H03F3/20 ,  H03F3/30 ,  H03F3/45

CPC分类号： H03F3/3072 ,  H03F1/22

摘要： A transistor amplifier in which collector to emitter voltages and currents are kept constant, particularly in the power output stages of the amplifying devices for minimizing distortion due to changes in the transistor beta, the essential form of distortion in amplifiers. High fidelity low power output current from a cascoded transistor amplifier is fed through a load to a second, high power, amplifier having constant current and less than unity gain, with an output summed with the output of the first amplifier such that the output of the first low power amplifier is the signal bearing portion and the output of the second amplifier serves as a current bootstrap, increasing the effective impedance of the load as seen by the first amplifier.

摘要翻译： 一种晶体管放大器，其中集电极到发射极的电压和电流保持恒定，特别是在放大器件的功率输出级中，用于最小化由于晶体管β的变化引起的失真，放大器的基本形式失真。 来自级联晶体管放大器的高保真低功率输出电流通过负载馈送到具有恒定电流且小于单位增益的第二高功率放大器，其输出与第一放大器的输出相加，使得输出 第一低功率放大器是信号承载部分，第二放大器的输出用作电流自举，增加第一放大器所看到的负载的有效阻抗。

公开(公告)号：US3995228A

公开(公告)日：1976-11-30

申请号：US616901

申请日：1975-09-26

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： H03F3/18 ,  H03F3/20 ,  H03F3/30 ,  H03F3/183

CPC分类号： H03F3/3074

摘要： A transistor audio amplifier of the Class AB complementary symmetry type is biased with a new bias circuit to keep both transistors on during all normal signal conditions. The bias circuit includes a pair of series connected V.sub.BE Multipliers with an interconnection between the two multipliers receiving signal feedback from the amplifier output such that the Multipliers can bias both complementary transistors on for all normal signal operating conditions.

摘要翻译： AB类互补对称型晶体管音频放大器用新的偏置电路偏置，以在所有正常信号条件下保持两个晶体管导通。 偏置电路包括一对串联连接的VBE乘法器，两个乘法器之间的互连接收来自放大器输出的信号反馈，使得乘法器可以在所有正常信号操作条件下偏置互补晶体管。

公开(公告)号：US5376899A

公开(公告)日：1994-12-27

申请号：US192173

申请日：1994-02-04

申请人： Nelson S. Pass

发明人： Nelson S. Pass

IPC分类号： H03F1/22 ,  H03F3/45

CPC分类号： H03F3/45206 ,  H03F1/223 ,  H03F2203/45028 ,  H03F2203/45116

摘要： An amplifier circuit having two identical inverting folded-cascode amplifier stages coupled together through a coupling resistor at the positive terminals of the respective stages. Each stage includes an input gain transistor whose gate forms the negative input terminal of the amplifier stage coupled to receive an input signal through an input resistor, whose source forms the positive input terminal of the amplifier stage, and whose drain is connected to the source of a level-shifting cascode transistor. Both transistors are supplied current from a constant current source also connected to the source of the level-shifting transistor. The drain of the level-shifting transistor forms an output terminal of the amplifier stage. Each stage feeds its amplifier output negatively to the positive input of the other stage, while at the same time feeding its distortion and noise contribution positively, via input gain transistor conduction, to the other stage. Balanced amplified outputs are produced from either balanced or unbalanced inputs, and distortion and noise components are produced in common on both outputs for differential cancellation. Complementary-symmetry and power amplifier versions of the basic single-ended line-level amplifier are also provided.

摘要翻译： 具有两个相同的反相折叠共源共栅放大器级的放大器电路，其通过耦合电阻在各级的正端耦合在一起。 每个级包括输入增益晶体管，其栅极形成放大器级的负输入端，其耦合以通过输入电阻器接收输入信号，其源极形成放大器级的正输入端，并且其漏极连接到 电平移位共源共栅晶体管。 两个晶体管都是从也连接到电平移位晶体管的源极的恒流源供电。 电平移位晶体管的漏极形成放大器级的输出端。 每个阶段将其放大器输出负向馈给另一级的正输入，同时通过输入增益晶体管导通将其失真和噪声贡献正向馈送到另一级。 平衡放大输出由平衡或不平衡输入产生，并且在两个输出上产生失真和噪声分量，用于差分消除。 还提供了基本单端线路电平放大器的互补对称和功率放大器版本。