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91. 发明授权

US6144256A Wide bandwidth, current sharing, Mosfet audio power amplifier with multiple feedback loops 失效
标题翻译：宽带宽，电流共享，具有多个反馈回路的Mosfet音频功率放大器
公开(公告)号：US6144256A
公开(公告)日：2000-11-07
申请号：US118195
申请日：1998-07-17
申请人： Anthony T. Barbetta
发明人： Anthony T. Barbetta
IPC分类号： H03F1/08 , H03F1/34 , H03F3/26 , H03F3/30
CPC分类号： H03F3/3001 , H03F1/086 , H03F1/342 , H03F3/265 , H03F3/3018
摘要： A wide bandwidth, multi-FET current sharing output stage, MOS audio power amplifier employs multiple feedback loops. An audio input is supplied to a voltage feedback amplifier stage driving a push-pull voltage gain/phase splitter stage. A bias adjustment stage driven from the push-pull voltage gain/phase splitter stage drives a current drive stage. The current drive stage drives an output stage comprising a plurality of paralleled current shared individual MOS output transistors driving an output node connected to a load. Up to three feedback loops are employed. A first voltage feedback loop comprises a voltage feedback stage having an input connected to a voltage divider driven from the first terminal of the load and an output connected to a feedback input node in the voltage feedback amplifier stage. A second voltage feedback loop comprises a voltage feedback stage having an input connected to the first terminal of the load and an output connected to a feedback input node in the push-pull voltage gain/phase splitter stage. A third feedback loop comprises a current feedback stage having an input in series between the output node and the load and an output connected to a feedback input node in the voltage feedback amplifier stage. The current feedback connection works in conjunction with input stage to lower distortion and provide a relatively flat frequency response.
摘要翻译：宽带宽，多FET电流共享输出级，MOS音频功率放大器采用多个反馈回路。将音频输入提供给驱动推挽式电压增益/分相器级的电压反馈放大器级。由推挽电压增益/分相器级驱动的偏置调节级驱动电流驱动级。当前驱动级驱动包括驱动连接到负载的输出节点的多个并联的当前共享的独立MOS输出晶体管的输出级。最多使用三个反馈回路。第一电压反馈回路包括电压反馈级，其具有连接到从负载的第一端子驱动的分压器的输入端和连接到电压反馈放大器级中的反馈输入节点的输出端。第二电压反馈回路包括具有连接到负载的第一端子的输入的电压反馈级和连接到推挽式电压增益/分相器级中的反馈输入节点的输出。第三反馈回路包括具有在输出节点和负载之间串联的输入的电流反馈级和连接到电压反馈放大器级中的反馈输入节点的输出。电流反馈连接与输入级一起工作，以降低失真并提供相对平坦的频率响应。

92. 发明授权

US6084469A MR-preamp using collector and emitter coupling integrated capacitors 失效
标题翻译： MR前置放大器采用集电极和发射极耦合集成电容
公开(公告)号：US6084469A
公开(公告)日：2000-07-04
申请号：US45147
申请日：1998-03-20
申请人： Perry Lorenz
发明人： Perry Lorenz
IPC分类号： G11B5/012 , G11B5/02 , H03F1/08 , H03F1/48 , H03F3/45
CPC分类号： H03F1/48 , H03F1/083 , G11B5/012 , G11B5/02
摘要： A circuit and method for lowering the corner frequency of a differential preamplifier having an AC coupling circuit includes a compensation circuit to adjust the frequency response characteristics created by the AC coupling circuit. An RC network in the compensation circuit is configured to provide a canceling zero at the corner frequency of the AC coupling circuit. The RC network also provides a pole at a desired frequency lower than the corner frequency of the AC coupling circuit, in order to define the overall preamplifier corner frequency. The compensation circuit allows the capacitance in the AC coupling circuit to be significantly reduced, eliminating the need for external components or a very large integrated capacitance.
摘要翻译：用于降低具有AC耦合电路的差分前置放大器的转角频率的电路和方法包括补偿电路，用于调整由AC耦合电路产生的频率响应特性。补偿电路中的RC网络被配置为在AC耦合电路的拐角频率处提供抵消零。 RC网络还以比AC耦合电路的转角频率低的期望频率提供极点，以便定义整个前置放大器转角频率。补偿电路允许AC耦合电路中的电容显着降低，无需外部元件或非常大的集成电容。

93. 发明授权

US6005440A Operational amplifier 失效
标题翻译：运算放大器
公开(公告)号：US6005440A
公开(公告)日：1999-12-21
申请号：US120846
申请日：1998-07-23
申请人： Seiji Okamoto
发明人： Seiji Okamoto
IPC分类号： H03F1/08 , H03F1/52 , H03F3/30 , H03F3/45 , H03F3/72 , H02H7/20
CPC分类号： H03F3/72 , H03F1/086 , H03F1/523 , H03F3/3032 , H03F3/4521
摘要： An operational amplifier capable of supplying a large power approximate to a power supply voltage to a load resistance and of rendering the current consumption relative to the power supply voltage small when a signal is not issued. The operational amplifier comprises a first differential amplifying stage, a first amplifying stage, a first level shifting stage, a second differential amplifying stage, a second amplifying stage, a second level shifting stage, and outputting stage, a first phase compensation circuit and a second compensation circuit. The first differential amplifying stage differentially amplifies input signals while n-channel transistors serves as a differential amplifying elements. The second differential amplifying stage differentially amplifies input signals while p-channel transistors serves as a differential amplifying elements. The first amplifying stage amplifies an output of the first differential amplifying stage in opposite phase. The second amplifying stage amplifies an output of the second differential amplifying stage in opposite phase. The outputting stage comprising a p-channel transistor a source of which is connected to a first power supply voltage and an n-channel transistor a source of which is connected to a second power supply voltage for executing complementary operation in response to outputs of the first and second differential amplifying stages. The first level shifting stage level shifts an output of the first amplifying stage in the direction of the first power supply voltage to control a gate of the n-channel transistor of the outputting stage. The second level shifting stage level shifts an output of the second amplifying stage in the direction of the second power supply voltage to control a gate of the p-channel transistor of the outputting stage.
摘要翻译：一种运算放大器，能够在不发出信号的情况下，向电源电压提供近似于负载电阻的大功率，并且使电流消耗相对于电源电压小。运算放大器包括第一差分放大级，第一放大级，第一级移位级，第二差分放大级，第二放大级，第二级移位级和输出级，第一相位补偿电路和第二级补偿电路补偿电路。第一差分放大级差分放大输入信号，而n沟道晶体管用作差分放大元件。第二差分放大级差分放大输入信号，而p沟道晶体管用作差分放大元件。第一放大级以相反相放大第一差分放大级的输出。第二放大级以相反的相位放大第二差分放大级的输出。输出级包括一个p沟道晶体管，其源极连接到第一电源电压，而n沟道晶体管的源极连接到第二电源电压，用于响应于第一电源电压的输出而执行互补操作和第二差分放大级。第一电平移位级电平使第一放大级的输出沿第一电源电压的方向移位，以控制输出级的n沟道晶体管的栅极。第二电平移位级电平在第二电源电压的方向上移动第二放大级的输出，以控制输出级的p沟道晶体管的栅极。

94. 发明授权

US5994960A High speed switched op-amp for low supply voltage applications 失效
标题翻译：用于低电源电压应用的高速开关运算放大器
公开(公告)号：US5994960A
公开(公告)日：1999-11-30
申请号：US948562
申请日：1997-10-10
申请人： Andrea Baschirotto , Angelo Nagari , Rinaldo Castello
发明人： Andrea Baschirotto , Angelo Nagari , Rinaldo Castello
IPC分类号： H03F1/08 , H03F3/72 , H03F3/45 , H03F1/14
CPC分类号： H03F3/72 , H03F1/086 , H03F2200/513
摘要： In a switched operational amplifier including a differential input stage and at least a second output stage, the compensation capacitor commonly required to couple the output node of the second stage with the respective output node of the input differential stage of the amplifier is associated with a switching circuit. The switching circuit is controlled by the same control phase that enables/disables the amplifier for interrupting the connection between the compensation capacitor (CC) and the output node of the differential input stage during a phase in which the amplifier is disabled for reducing the switch-on time. Notably the differential input stage of the operational amplifier remains always active and only the second output stage is switched on and off.
摘要翻译：在包括差分输入级和至少第二输出级的开关运算放大器中，将第二级的输出节点与放大器的输入差分级的相应输出节点耦合起来的补偿电容器与切换电路。开关电路由相同的控制相位控制，使得放大器能够在禁止放大器以减少开关电流的相位期间中断补偿电容器（CC）和差分输入级的输出节点之间的连接，准时。值得注意的是，运算放大器的差分输入级保持始终有效，只有第二个输出级接通和关断。

95. 发明授权

US5917376A Circuit and technique for compensating high gain amplifier without compensation capacitors 失效
标题翻译：用于补偿没有补偿电容器的高增益放大器的电路和技术
公开(公告)号：US5917376A
公开(公告)日：1999-06-29
申请号：US916869
申请日：1997-08-22
申请人： Vadim V. Ivanov , Valery N. Ivanov
发明人： Vadim V. Ivanov , Valery N. Ivanov
IPC分类号： H03F1/08 , H03F1/00 , H03F3/04 , H03F3/45
CPC分类号： H03F1/083 , H03F2200/261
摘要： A three-stage amplifier including first, second, and third sequentially coupled stages is compensated without use of compensation capacitors, by applying an input signal to an input of the first stage and a first input of a first feed-forward stage, coupling an output signal of the first feed-forward stage to an output of the second stage, the second stage having an input coupled to an output of the first stage, coupling an output signal of the first stage to an input of a second feed-forward stage, coupling an output of the second feed-forward stage to an output of the third stage, coupling the input signal to an input of a third feed-forward stage, and coupling an output of the third feed-forward stage to the output of the third stage.
摘要翻译：通过将输入信号施加到第一级的输入和第一前馈级的第一输入，对包括第一，第二和第三顺序耦合级的三级放大器进行补偿而不使用补偿电容器，将第一前馈级的信号输入到第二级的输出，第二级具有耦合到第一级的输出的输入，将第一级的输出信号耦合到第二前馈级的输入，将所述第二前馈级的输出耦合到所述第三级的输出，将所述输入信号耦合到第三前馈级的输入，以及将所述第三前馈级的输出耦合到所述第三级前级的输出阶段。

96. 发明授权

US5880636A Input stage for operational amplifier utilizing phase delay of active load current mirror to achieve improved bandwidth and phase margin 失效
标题翻译：使用有源负载电流镜的相位延迟的运算放大器的输入级，实现改进的带宽和相位裕度
公开(公告)号：US5880636A
公开(公告)日：1999-03-09
申请号：US662051
申请日：1996-06-12
申请人： Victor P. Schrader
发明人： Victor P. Schrader
IPC分类号： H03F1/08 , H03F3/45
CPC分类号： H03F3/45085 , H03F1/083 , H03F2203/45318 , H03F2203/45346 , H03F2203/45674
摘要： In a technique for reducing the transconductance of an input stage of an operational amplifier, the phase delay which the active load current mirror introduces into the single path is utilized in a way such that the phase delay of the overall stage is less than the delay of the primary differential pair. It is a mathematical fact that when two sinusoidal signals of the same frequency are added together, the result is also sinusoidal. Considering two such signals, the second of which has a phase lag with respect to the first, if the two signals are combined by the addition of ordinates, the resulting sinusoid also has a phase lag. However, if the second signal is instead subtracted from the first, then the resulting sinusoid has a phase lead with resect to the first signal. The present invention makes use of this phenomenon by causing the delayed mirror signal to be subtracted from, rather than added to, the primary signal. This produces a differential transconductance stage with less negative phase shift than that of the prior art, in fact less than that of the primary differential pair alone.
摘要翻译：在减小运算放大器的输入级的跨导的技术中，有源负载电流镜引入到单个路径中的相位延迟以这样的方式被利用，使得整个级的相位延迟小于主差分对。当一个相同频率的两个正弦信号相加在一起时，这是一个数学事实，结果也是正弦曲线。考虑到两个这样的信号，其中第二个信号相对于第一个信号具有相位滞后，如果通过加上纵坐标来组合两个信号，则所得到的正弦曲线也具有相位滞后。然而，如果第二信号相反地从第一信号中减去，则产生的正弦波具有切换到第一信号的相位导通。本发明通过使延迟的镜像信号从主信号中减去而不是添加到原始信号中来利用这种现象。这产生了与现有技术相比具有更小的负相移的差分跨导级，实际上小于单差分对。

97. 发明授权

US5834976A Frequency self-compensated operational amplifier 失效
标题翻译：频率自补偿运算放大器
公开(公告)号：US5834976A
公开(公告)日：1998-11-10
申请号：US756024
申请日：1996-11-26
申请人： Luciano Tomasini , Rinaldo Castello , Giancarlo Clerici , Ivan Bietti
发明人： Luciano Tomasini , Rinaldo Castello , Giancarlo Clerici , Ivan Bietti
IPC分类号： H03F1/08 , H03F1/14 , H03F1/34
CPC分类号： H03F1/086
摘要： An operational amplifier frequency self-compensated with respect to closed-loop gain comprises a transconductance input stage and an amplifier output stage connected serially together to receive an input signal on at least one input terminal of the amplifier and generate an amplified signal on an output terminal of the amplifier. Provided between the input and output stages is an intermediate node which is connected to a compensation block to receive a frequency-variable compensation signal therefrom. The compensation block is coupled with its input to the input terminal of the amplifier The compensation block is connected to receive at least the feedback signal. Preferably, the compensation signal is variable as a function of a gain value which is determined by the feedback circuit, and said variation of the compensation signal occurs in a relationship of inverse proportionality to the gain value.
摘要翻译：相对于闭环增益自补偿的运算放大器频率包括跨导输入级和串联连接的放大器输出级，以在放大器的至少一个输入端上接收输入信号，并在输出端产生放大信号的放大器。在输入级和输出级之间设置有中间节点，其连接到补偿块以从其接收频率可变的补偿信号。补偿块与其输入耦合到放大器的输入端子。补偿块被连接以至少接收反馈信号。优选地，补偿信号作为由反馈电路确定的增益值的函数而变化，并且补偿信号的所述变化以与增益值成反比关系的关系发生。

98. 发明授权

US5767538A Integrated photodiode/transimpedance amplifier 失效
标题翻译：集成光电二极管/跨阻放大器
公开(公告)号：US5767538A
公开(公告)日：1998-06-16
申请号：US728347
申请日：1996-10-09
申请人： Edward Mullins , Rodney T. Burt , Walter B. Meinel , R. Mark Stitt, II
发明人： Edward Mullins , Rodney T. Burt , Walter B. Meinel , R. Mark Stitt, II
IPC分类号： H03F1/08 , H03F3/08 , H01L29/74 , H01L27/148 , H01L29/768 , H01L31/111
CPC分类号： H03F1/08 , H03F3/08
摘要： An integrated circuit photodetector includes a transimpedance amplifier including a differential amplifier stage with PNP emitter-coupled transistors and a PNP input transistor which are biased only by base currents of the emitter-coupled transistors, to achieve low input bias current. Low noise operation is achieved by bypass capacitors coupled between the bases and emitters of the input transistors, respectively. A constant current source supplies a current which develops a small pedestal voltage across a resistor to bias the non-inverting input of the transimpedance amplifier so as to avoid nonlinear amplification of low level light signals. A positively biased N-type guard tub surrounds the photodetector, which is formed in a junction-isolated N region on a P substrate, to collect electrons generated in the substrate by deep-penetrating IR light to prevent them from causing amplification errors. In one embodiment, a feedback network includes a resistor connected between the output of a buffer driven by the transimpedance amplifier and an inverting input thereof, and a capacitor connected between the output and inverting input of the transimpedance amplifier to provide low noise, fast settling operation.
摘要翻译：集成电路光电检测器包括跨阻抗放大器，其包括具有PNP发射极耦合晶体管的差分放大器级和仅由发射极耦合晶体管的基极电流偏置的PNP输入晶体管，以实现低输入偏置电流。分别通过耦合在输入晶体管的基极和发射极之间的旁路电容来实现低噪声操作。恒流源提供电流，该电流在电阻器两端产生小的基座电压，以偏置跨阻放大器的非反相输入，以避免低电平光信号的非线性放大。正偏置N型保护桶围绕形成在P基板上的结隔离N区域中的光电检测器，以通过深穿透IR光收集在衬底中产生的电子，以防止它们引起放大误差。在一个实施例中，反馈网络包括连接在由跨阻抗放大器驱动的缓冲器的输出与其反相输入之间的电阻器，以及连接在跨阻放大器的输出和反相输入端之间以提供低噪声，快速稳定操作。

99. 发明授权

US5708376A Variable-gain amplifying device 失效
标题翻译：可变增益放大装置
公开(公告)号：US5708376A
公开(公告)日：1998-01-13
申请号：US672032
申请日：1996-06-26
申请人： Chikaho Ikeda
发明人： Chikaho Ikeda
IPC分类号： H03G3/12 , H03F1/08 , H03F1/30 , H03F1/34 , H03F3/34 , H03F3/45 , H03F1/02
CPC分类号： H03F1/303 , H03F1/086
摘要： A variable-gain amplifying device uses different gains for amplifying an input bias voltage signal, and an input composite signal produced by superposing an input bias voltage signal on an input signal, respectively.
摘要翻译：可变增益放大装置使用不同的增益来放大输入偏置电压信号，以及通过在输入信号上叠加输入偏置电压信号而产生的输入复合信号。

100. 发明授权

US5703292A Sensor having an off-frequency drive scheme and a sense bias generator utilizing tuned circuits 失效
标题翻译：具有偏置驱动方案的传感器和利用调谐电路的感测偏压发生器
公开(公告)号：US5703292A
公开(公告)日：1997-12-30
申请号：US425960
申请日：1995-04-19
申请人： Paul A. Ward
发明人： Paul A. Ward
IPC分类号： G01C19/56 , G01P9/04 , H03F1/08
CPC分类号： H03F1/083 , G01C19/5719
摘要： Electronics for use in Coriolis and other sensors for reducing errors in the sensor output signal. The electronics includes an off-frequency drive scheme for reducing in-band drive signal coupling to the output signal and techniques for reducing errors in the sensor output signal due to quadrature and phase shift. The off-frequency drive scheme includes a frequency translation circuit in the excitation feedback loop of a sensor system to suppress components of the sensor drive signal at a predetermined frequency so that coupling of the drive signal to the sensor output signal can be readily removed by conventional filtering techniques. The sensor system includes a nonlinear input transducer for converting the drive signal to a force signal such that the force signal has a component at the predetermined frequency while the drive signal does not. A tuned circuit amplifies and filters the frequency shifted output signal of the translation circuit to provide the drive signal. Also provided is a sense bias generator including a tuned circuit for amplifying the available bias supply voltage to enhance sensitivity.
摘要翻译：用于科里奥利和其他传感器的电子装置，用于减少传感器输出信号的误差。电子装置包括用于减少与输出信号耦合的带内驱动信号的非频率驱动方案和用于减少由于正交和相移导致的传感器输出信号中的误差的技术。偏频驱动方案包括传感器系统的激励反馈回路中的频率转换电路，以预定频率抑制传感器驱动信号的分量，从而可以通过常规的方式将驱动信号与传感器输出信号的耦合容易地去除过滤技术。传感器系统包括非线性输入传感器，用于将驱动信号转换成力信号，使得力信号在驱动信号不具有预定频率的分量时。调谐电路对转换电路的频移输出信号进行放大和滤波以提供驱动信号。还提供了一种感测偏置发生器，其包括用于放大可用偏置电源电压以提高灵敏度的调谐电路。

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