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1. 发明授权

US06133782A Integrator-filter circuit 失效
标题翻译：积分滤波电路
公开(公告)号：US06133782A
公开(公告)日：2000-10-17
申请号：US195058
申请日：1998-11-18
申请人： Axel Kattner , Holger Gehrt
发明人： Axel Kattner , Holger Gehrt
IPC分类号： H03H11/04 , H03B1/00
CPC分类号： H03H11/04 , H03F2200/462 , H03F2200/477 , H03F2203/21161 , H03F2203/45066 , H03F2203/45076
摘要： To achieve a constant control range in an integrator-filter circuit for filtering a push-pull signal, having at least two integrator elements (1) this second control current being having resistors (11, 12) arranged at its inputs, a subsequent current multiplier (13) having two signal inputs (14, 15) and preceding a push-pull amplifier (18) with an inverting input (20) and a non-inverting input (19), having inverting output (21) fed back to the non-inverting input (19) and a non-inverting output (23) fed back to the inverting input (20) via capacitances (22, 24), the current multiplier (13) receiving, at two control inputs (37, 38), a first and a second control current (I.sub.1, I.sub.2) for adjusting the integration time constant of the integrator element (1) is adjustable and from which the second control current (I.sub.2) flows in substantially two halves through the signal inputs (14, 15) of the current multiplier (13), an associated third control current (I.sub.3) is generated which, in dependence upon a second control voltage (U.sub.2) is generated, at whose variation the third control current (I.sub.3) varies proportionally to the second control current (I.sub.2). An associated compensation circuit (2) is provided for each integrator element (1).
摘要翻译：为了在用于滤波推挽信号的积分器滤波器电路中实现恒定的控制范围，具有至少两个积分器元件（1），该第二控制电流具有布置在其输入端的电阻器（11,12），随后的电流倍增器（13）具有两个信号输入（14,15），并且在具有反相输入（20）和反相输入（19）的推挽放大器（18）之前，具有反馈输出（21）反馈到非反相输入通过电容（22,24）反相输入（19）和反相输出（23）反馈到反相输入（20），电流倍增器（13）在两个控制输入（37,38）处接收用于调整积分元件（1）的积分时间常数的第一和第二控制电流（I1，I2）是可调节的，并且第二控制电流（I2）通过信号输入（14,15）基本上从两个半部流入），产生相关联的第三控制电流（I3），其依赖于上述 n产生第二控制电压（U2），其变化是第三控制电流（I3）与第二控制电流（I2）成比例地变化。为每个积分器元件（1）提供相关的补偿电路（2）。

2. 发明授权

US5229664A Programmable differentiator delay 失效
标题翻译：可编程差分延迟
公开(公告)号：US5229664A
公开(公告)日：1993-07-20
申请号：US725864
申请日：1991-07-03
申请人： Kevin E. Brehmer
发明人： Kevin E. Brehmer
IPC分类号： G11B5/09 , G11B20/10 , H03F3/45
CPC分类号： H03F3/45179 , G11B20/10009 , H03F3/45085 , H03F3/45278 , H03F3/45511 , H03F2200/219 , H03F2203/45004 , H03F2203/45076 , H03F2203/45082 , H03F2203/45144 , H03F2203/45201 , H03F2203/45244 , H03F2203/45362 , H03F2203/45366 , H03F2203/45641 , H03F2203/45646 , H03F2203/45648 , H03F2203/45712 , H03F2203/45732
摘要： A programmable delay for the gate signal output of the differentiator in a data analyzing circuit is provided. A data signal is produced by a low pass filter, and a differentiator (high pass filter) produces a gate signal. The cutoff frequency of the low pass filter is controlled by a first control circuit, and a second control circuit is provided to separately control the cutoff frequency of the high pass filter. The second control circuit produces a variation from the base frequency determined by the first control circuit. Thus, the cutoff frequency of the high pass filter will always be proportional to that of the low pass filter.

3. 发明申请

US20130230183A1 ECHO CANCELLATION 有权
标题翻译： ECHO取消
公开(公告)号：US20130230183A1
公开(公告)日：2013-09-05
申请号：US13410677
申请日：2012-03-02
申请人： Joakim Eriksson , Jonny Strandh
发明人： Joakim Eriksson , Jonny Strandh
IPC分类号： H04B3/20 , H04R3/00
CPC分类号： H04R3/02 , H03F3/185 , H03F2200/03 , H03F2203/45076 , H03F2203/45082 , H03F2203/45084 , H03F2203/45088 , H04R19/016
摘要： The invention is directed to echo cancellation for a microphone system. An exemplary microphone system comprises a first transistor, wherein a gate terminal of the first transistor is connected to a ground terminal via a microphone electret element, the microphone electret element being associated with a capacitance and a voltage, the microphone electret element reverse biasing the first transistor; and a second transistor in parallel with the first transistor, wherein a gate terminal of the second transistor is connected to the ground terminal via a capacitor, the capacitance of the capacitor being selected to suppress at least a portion of a common mode signal, and wherein the gate terminal of the second transistor is not connected to the microphone electret element. The common mode signal comprises the echo, which may be the output of a speaker system that is received as input to the microphone system.
摘要翻译：本发明涉及用于麦克风系统的回波消除。示例性麦克风系统包括第一晶体管，其中第一晶体管的栅极端子经由麦克风驻极体元件连接到接地端子，所述麦克风驻极体元件与电容和电压相关联，所述麦克风驻极体元件反向偏置所述第一晶体管晶体管以及与所述第一晶体管并联的第二晶体管，其中所述第二晶体管的栅极端子经由电容器连接到所述接地端子，所述电容器的电容被选择为抑制共模信号的至少一部分，并且其中第二晶体管的栅极端子不连接到麦克风驻极体元件。共模信号包括回波，其可以是作为麦克风系统的输入接收的扬声器系统的输出。

4. 发明授权

US07250791B2 Current feedback amplifiers 有权
公开(公告)号：US07250791B2
公开(公告)日：2007-07-31
申请号：US11593288
申请日：2006-11-06
申请人： Jeffrey S. Lehto
发明人： Jeffrey S. Lehto
IPC分类号： H03F3/45
CPC分类号： H03F3/45484 , H03F3/4508 , H03F3/45475 , H03F2200/36 , H03F2200/91 , H03F2203/45076 , H03F2203/45116 , H03F2203/45138 , H03F2203/45248 , H03F2203/45366 , H03F2203/45528 , H03F2203/45641 , H03F2203/45642
摘要： Current feedback amplifiers circuits that generate common mode (CM) and/or differential mode (DM) currents are provided herein. This description is not intended to be a complete description of, or limit the scope of, the invention. Other features, aspects, and objects of the invention can be obtained from a review of the specification, the figures and the claims.

5. 发明授权

US06175226B1 Differential amplifier with common-mode regulating circuit 有权
标题翻译：具有共模调节电路的差分放大器
公开(公告)号：US06175226B1
公开(公告)日：2001-01-16
申请号：US09518562
申请日：2000-03-03
申请人： Giancarlo Clerici , Luciano Tomasini
发明人： Giancarlo Clerici , Luciano Tomasini
IPC分类号： G05F316
CPC分类号： H03F3/45089 , H03F3/45497 , H03F2203/45008 , H03F2203/45076 , H03F2203/45658
摘要： A fully differential amplifier, in other words one having differential inputs and outputs, is associated with a circuit to regulate the output voltage reference. This circuit contains a resistive divider connected between the output terminals of the differential amplifier, a diode between the intermediate connection of the divider and common bases of load transistors of the differential amplifier, and a current mirror having a first branch connected to a reference voltage generator and a second branch which forms a current generator connected between the common bases of the load transistors and ground. This provides an efficient feedback control system with low power consumption and takes up less space on an integrated circuit.
摘要翻译：具有差分输入和输出的全差分放大器与用于调节输出电压基准的电路相关联。该电路包括连接在差分放大器的输出端子之间的电阻分压器，分压器的中间连接器和差分放大器的负载晶体管的公共基极之间的二极管，以及具有连接到参考电压发生器以及第二分支，其形成连接在负载晶体管的公共基极和地之间的电流发生器。这提供了一种低功耗的有效的反馈控制系统，并且在集成电路上占用较少的空间。

6. 发明授权

US5008632A Temperature compensated feedback circuit for setting and stabilizing amplifier DC bias points 失效
标题翻译：用于设置和稳定放大器直流偏置点的温度补偿反馈电路
公开(公告)号：US5008632A
公开(公告)日：1991-04-16
申请号：US429665
申请日：1989-10-31
申请人： Philip H. Sutterlin
发明人： Philip H. Sutterlin
IPC分类号： H03F1/30 , H03F3/34 , H03F3/347 , H03F3/45
CPC分类号： H03F1/30 , H03F3/45502 , H03F2203/45008 , H03F2203/45074 , H03F2203/45076 , H03F2203/45082 , H03F2203/45202 , H03F2203/45212 , H03F2203/45266 , H03F2203/45392 , H03F2203/45418 , H03F2203/45424 , H03F2203/45466 , H03F2203/45476 , H03F2203/45702
摘要： Described is an improved differential amplifier arrangement with a temperature compensated feedback circuit which sets and stabilizes the DC bias point of the amplifier. The circuit averages the two outputs of the amplifier and generates a DC voltage which is compared with a reference voltage to generate a control signal which is amplified and is used to control the bias point of the amplifier.

7. 发明授权

US08965013B2 Echo cancellation 有权
标题翻译：回声取消
公开(公告)号：US08965013B2
公开(公告)日：2015-02-24
申请号：US13410677
申请日：2012-03-02
申请人： Joakim Eriksson , Jonny Strandh
发明人： Joakim Eriksson , Jonny Strandh
IPC分类号： H04R25/00 , H04R3/00 , H04R9/08
CPC分类号： H04R3/02 , H03F3/185 , H03F2200/03 , H03F2203/45076 , H03F2203/45082 , H03F2203/45084 , H03F2203/45088 , H04R19/016
摘要： The invention is directed to echo cancellation for a microphone system. An exemplary microphone system comprises a first transistor, wherein a gate terminal of the first transistor is connected to a ground terminal via a microphone electret element, the microphone electret element being associated with a capacitance and a voltage, the microphone electret element reverse biasing the first transistor; and a second transistor in parallel with the first transistor, wherein a gate terminal of the second transistor is connected to the ground terminal via a capacitor, the capacitance of the capacitor being selected to suppress at least a portion of a common mode signal, and wherein the gate terminal of the second transistor is not connected to the microphone electret element. The common mode signal comprises the echo, which may be the output of a speaker system that is received as input to the microphone system.
摘要翻译：本发明涉及用于麦克风系统的回波消除。示例性麦克风系统包括第一晶体管，其中第一晶体管的栅极端子经由麦克风驻极体元件连接到接地端子，所述麦克风驻极体元件与电容和电压相关联，所述麦克风驻极体元件反向偏置所述第一晶体管晶体管以及与所述第一晶体管并联的第二晶体管，其中所述第二晶体管的栅极端子经由电容器连接到所述接地端子，所述电容器的电容被选择为抑制共模信号的至少一部分，并且其中第二晶体管的栅极端子不连接到麦克风驻极体元件。共模信号包括回波，其可以是作为麦克风系统的输入接收的扬声器系统的输出。

8. 发明申请

US20080315951A1 CLASS AB DIFFERENTIAL AMPLIFIER WITH OUTPUT STAGE COMMON MODE FEEDBACK 审中-公开
标题翻译：具有输出级通用模式反馈的AB类差分放大器
公开(公告)号：US20080315951A1
公开(公告)日：2008-12-25
申请号：US11765211
申请日：2007-06-19
申请人： JEFFREY RYSINSKI , Sanjayan Vinayagamoorthy
发明人： JEFFREY RYSINSKI , Sanjayan Vinayagamoorthy
IPC分类号： H03F3/45
CPC分类号： H03F3/45183 , H03F3/45659 , H03F2203/45076 , H03F2203/45082
摘要： A differential amplifier includes an output stage, a first common mode feedback circuit; and a current source. The output stage includes first and second complimentary output terminals. The first common mode feedback circuit is operable to determine an average voltage across the first and second complimentary output terminals. The current source is coupled to the output stage, and the common mode feedback circuit is operable to control the current source based on the average voltage. A method includes determining an average voltage across a positive output terminal and a negative output terminal of a differential amplifier output stage and controlling current injected into the output stage based on the average voltage.
摘要翻译：差分放大器包括输出级，第一共模反馈电路; 和当前来源。输出级包括第一和第二互补输出端子。第一共模反馈电路可操作以确定第一和第二互补输出端子两端的平均电压。电流源耦合到输出级，并且共模反馈电路可操作以基于平均电压来控制电流源。一种方法包括确定差分放大器输出级的正输出端和负输出端两端的平均电压，并根据平均电压控制注入到输出级的电流。

9. 发明授权

US06198350B1 Signal amplifier with fast recovery time response, efficient output driver and DC offset cancellation capability 有权
标题翻译：具有快速恢复时间响应的信号放大器，高效的输出驱动器和DC偏移消除功能
公开(公告)号：US06198350B1
公开(公告)日：2001-03-06
申请号：US09290835
申请日：1999-04-13
申请人： Seyed Ramezan Zarabadi
发明人： Seyed Ramezan Zarabadi
IPC分类号： H03F326
CPC分类号： H03F3/45179 , H03F3/45717 , H03F2203/45068 , H03F2203/45074 , H03F2203/45076 , H03F2203/45078 , H03F2203/45081 , H03F2203/45188 , H03F2203/45212 , H03F2203/45508
摘要： A signal amplifying circuit (24) includes level shifting input circuits (D1-D4) permitting input common-mode voltages (VIN1 and VIN2) of an amplifier and fault detection circuit (50) to vary between preset limits. The sense amplifier circuit (24) includes a DC offset buffer circuit (52) operable to receive an analog DC offset compensation signal and provide this signal to an input of the amplifier and fault detection circuit (50). The buffered DC offset compensation signal provided to the amplifier and fault detection circuit (50) is operable to reduce an aggregate DC offset voltage attributable to signal amplifying circuit (24) to a desired DC offset level. The amplifier and fault detection circuit (50) also includes a fault detection function whereby an output (VSENSE) of the amplifier circuit (50) is forced to a predetermined output state if either, or both, of the inputs (VIN1 and VIN2) of the sense amplifier circuit (24) are unconnected; i.e., floating. The output (VSENSE) of the amplifier and fault detection circuit (50) is provided to an output buffer circuit (54) operable to modulate the load current supplied to an output (VOUT1, VOUT2) thereof as a function of a difference between the amplifier output signal (VSENSE) and the output buffer output signal (VOUT1).
摘要翻译：信号放大电路（24）包括允许放大器和故障检测电路（50）的输入共模电压（VIN1和VIN2）在预设极限之间变化的电平移位输入电路（D1-D4）。读出放大器电路（24）包括DC偏移缓冲电路（52），可操作以接收模拟DC偏移补偿信号，并将该信号提供给放大器和故障检测电路（50）的输入端。提供给放大器和故障检测电路（50）的缓冲DC偏移补偿信号可操作以将归因于信号放大电路（24）的总的DC偏移电压减小到期望的DC偏移电平。放大器和故障检测电路（50）还包括故障检测功能，由此如果放大器电路（50）的输入（VIN1和VIN2）的输入（VIN1和VIN2）之一或两者被强制为预定的输出状态读出放大器电路（24）不连接; 即浮动。放大器和故障检测电路（50）的输出（VSENSE）被提供给输出缓冲器电路（54），该输出缓冲器电路（54）可用于调制提供给其输出（VOUT1，VOUT2）的负载电流作为放大器输出信号（VSENSE）和输出缓冲器输出信号（VOUT1）。

10. 发明授权

US5668468A Common mode stabilizing circuit and method 失效
标题翻译：共模稳定电路及方法
公开(公告)号：US5668468A
公开(公告)日：1997-09-16
申请号：US584366
申请日：1996-01-11
申请人： Robert S. Cargill
发明人： Robert S. Cargill
IPC分类号： G05F3/24 , H03F3/45 , G05F3/16
CPC分类号： H03F3/45179 , G05F3/242 , H03F3/45183 , H03F3/45704 , H03F2203/45008 , H03F2203/45066 , H03F2203/45074 , H03F2203/45076 , H03F2203/45078 , H03F2203/45202 , H03F2203/45208 , H03F2203/45418 , H03F2203/45424 , H03F2203/45702
摘要： A circuit and method for stabilizing a common mode voltage in a differential circuit provides a desired common mode voltage V.sub.cm to control terminals of two transistors which provide the variable resistance for setting the common mode voltage. V.sub.cm is sampled between load resistors R.sub.L connecting operating terminals of the two transistors and applied directly to their control terminals. A known common mode current I.sub.cm is accepted by each transistor, leaving a differential current I.sub.d to flow through load resistors R.sub.L. The circuit and method find application in a variety of uses, including transconductance and transresistance amplifiers and automatic gain control circuits.
摘要翻译：用于稳定差分电路中的共模电压的电路和方法为控制提供用于设定共模电压的可变电阻的晶体管的端子提供期望的共模电压Vcm。在连接两个晶体管的工作端子的负载电阻RL之间对Vcm进行采样，直接施加到它们的控制端。每个晶体管接受已知的共模电流Icm，留下差分电流Id流过负载电阻器RL。该电路和方法可应用于各种应用，包括跨导和跨阻放大器以及自动增益控制电路。

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