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公开(公告)号：US06362681B1
公开(公告)日：2002-03-26
申请号：US09461782
申请日：1999-12-15
IPC分类号： H03K500
CPC分类号： H03H11/0422
摘要： A low pass filter with programmable equalization includes at least one biquadratic cell and a converter of the input voltage into a current, proportional to the derivative of the input voltage, that is injected on a node of the biquadratic cell to introduce two real and opposed zeros in the transfer function of the filter. The low pass filter includes two structurally similar circuits functionally connected in cascade. Each circuit includes a biquadratic cell and an input stage having two outputs injecting, through a first current output, the current to an input capacitor of the respective biquadratic cell, by a direct coupling in a first of the two circuits and in an inverted manner in the second of the two circuits. A second voltage output is coupled to an input of the respective biquadratic cell.
摘要翻译： 具有可编程均衡的低通滤波器包括至少一个二次电池和将输入电压转换为与输入电压的导数成比例的电流的转换器，其被注入到二次电池的节点上以引入两个实际和相对的零 在滤波器的传递函数中。 低通滤波器包括在功能上串联连接的两个结构相似的电路。 每个电路包括一个二次电池单元和一个具有两个输出端的输入级，输出端通过第一电流输出将电流通过两个电路中的第一个电路中的直接耦合并以相反的方式在相应的二次电池单元的输入电容器中注入 这两个电路中的第二个。 第二电压输出耦合到相应的双二次电池的输入端。
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公开(公告)号：US5963065A
公开(公告)日：1999-10-05
申请号：US787301
申请日：1997-01-24
CPC分类号： H03F3/3077
摘要： A low offset amplifier has an output stage constituted by an npn transistor and a pnp transistor in a push-pull arrangement, and a driver stage. The latter includes a current-mirror circuit having, in its input branch, a pnp transistor in series with a first constant-current generator and, in its output branch, an npn transistor, and two complementary bipolar transistors with collectors connected together to the output terminal and the bases are connected together to the input terminal of the amplifier. The emitter of the pnp transistor of the driver stage is connected to the positive terminal of the supply by a second constant-current generator and to the base of the npn transistor of the output stage, and the emitter of the npn transistor of the driver stage is connected to the negative terminal of the supply by the npn transistor of the output branch of the current-mirror circuit and to the base of the pnp transistor of the output stage. The amplifier has a very low or zero offset (Vos=Vout-Vin).
摘要翻译： 低失调放大器具有由推挽装置中的npn晶体管和pnp晶体管构成的输出级和驱动级。 后者包括电流镜电路，其在其输入支路中具有与第一恒定电流发生器串联的pnp晶体管，并且在其输出支路中具有npn晶体管，以及两个互补双极晶体管，其中集电极连接到输出端 端子和基极连接到放大器的输入端子。 驱动器级的pnp晶体管的发射极通过第二恒流发生器连接到电源的正极端子，并连接到输出级的npn晶体管的基极，驱动器级的npn晶体管的发射极 通过电流镜电路的输出支路的npn晶体管和输出级的pnp晶体管的基极连接到电源的负极。 放大器具有非常低或零偏移（Vos = Vout-Vin）。
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公开(公告)号：US6147825A
公开(公告)日：2000-11-14
申请号：US152866
申请日：1998-09-14
CPC分类号： H03K17/14 , H03K17/28 , G11B20/1403
摘要： A temperature-compensated high-speed timing circuit, which is particularly advantageous in read-interface circuits for disk-drive interface. The voltage on the integrating capacitor is compared against a voltage defined by the drop, on a resistor, induced by a current which is the combination of a reference current from a reference current generator with a temperature-dependent current from another current generator.
摘要翻译： 一种温度补偿高速定时电路，在磁盘驱动器接口的读取接口电路中特别有利。 将积分电容器上的电压与由电流引起的电压（由来自参考电流发生器的参考电流与来自另一电流发生器的温度相关电流的组合的电流）引起的电压进行比较。
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公开(公告)号：US5808971A
公开(公告)日：1998-09-15
申请号：US726075
申请日：1996-10-03
CPC分类号： H03K17/14 , H03K17/28 , G11B20/1403
摘要： A temperature-compensated high-speed timing circuit, which is particularly advantageous in read-interface circuits for disk-drive interface. The voltage on the integrating capacitor is compared against a voltage defined by the drop, on a resistor, induced by a current which is the combination of a reference current from a reference current generator with a temperature-dependent current from another current generator.
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5.发明授权Electrostatic MEMS driver with on-chip capacitance measurement for autofocus applications 有权用于自动对焦应用的具有片上电容测量的静电MEMS驱动器公开(公告)号：US08188755B2
公开(公告)日：2012-05-29
申请号：US12685992
申请日：2010-01-12
申请人： Roberto Alini , Roberto Casiraghi
发明人： Roberto Alini , Roberto Casiraghi
IPC分类号： G01R27/26
CPC分类号： G03B21/53 , G01R27/2605 , G02B7/08 , G03B3/10 , G03B13/34
摘要： A driver and capacitance measuring circuit includes a voltage source that selectively generates an output voltage at a first node during a driver mode to alter a capacitance of a device that is connected to the first node and that has a variable capacitance. A current source selectively provides one of a charging and discharging current at the first node during a measurement mode. A capacitance calculating circuit samples a voltage at the first node during the measurement node, determines a voltage change rate of the first node during the measurement mode and calculates the capacitance of the device based on the voltage change rate and a value of the one of the charging and discharging current.
摘要翻译： 驱动器和电容测量电路包括电压源，其在驱动器模式期间选择性地在第一节点处产生输出电压，以改变连接到第一节点并具有可变电容的装置的电容。 在测量模式期间，电流源选择性地提供第一节点处的充电和放电电流之一。 电容计算电路在测量节点期间对第一节点处的电压进行采样，在测量模式期间确定第一节点的电压变化率，并基于电压变化率和电压变化率的一个值计算器件的电容 充放电电流。
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公开(公告)号：US06512645B1
公开(公告)日：2003-01-28
申请号：US09393231
申请日：1999-09-09
申请人： Giuseppe Patti , Roberto Alini , Elango Pakriswamy
发明人： Giuseppe Patti , Roberto Alini , Elango Pakriswamy
IPC分类号： G11B509
摘要： A method and circuit are disclosed for controlling the write head of a magnetic disk storage device. The circuit includes a pull-up device coupled to a terminal of the write head, a current sink circuit which is coupled to the write head terminal and a bootstrap circuit coupled to the current sink circuit. When reversing the direction of current flow through the write head so that current is drawn from the write head from the write head terminal, the bootstrap circuit and the current sink circuit are activated. When the current in the write head nears and/or slightly surpasses the desired destination current level, the bootstrap circuit is deactivated and the pull-up device is thereafter immediately activated for a predetermined period of time.
摘要翻译： 公开了一种用于控制磁盘存储装置的写入头的方法和电路。 电路包括耦合到写头的端子的上拉装置，耦合到写入头端子的电流吸收电路和耦合到电流吸收电路的自举电路。 当逆向通过写入头的电流的方向使得电流从写入头从写入头抽出时，自举电路和电流吸收电路被激活。 当写头中的电流接近和/或稍微超过期望的目的地电流电平时，自举电路被去激活，然后上拉装置立即激活预定时间段。
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公开(公告)号：US5644267A
公开(公告)日：1997-07-01
申请号：US455850
申请日：1995-05-31
CPC分类号： H03H11/0433
摘要： A high-pass filter in particular for high-frequency applications and of the type comprising at least one input terminal (IN) and at least one output terminal (OUT) between which is defined a transfer function (FdT) and is inserted a biquadratic cell (18) incorporating a series of transconductance stages (2, 3, 4, 5) comprises a generator circuit (29) of variable currents (i.sub.K1, i.sub.K2) connected between a pair of stages (2, 3) of the biquadratic cell (18) and a voltage reference (GND). Said generator allows introduction of programmable zeroes in the transfer function (FdT) of the filter (20).
摘要翻译： 一种高通滤波器，特别适用于高频应用，并且包括至少一个输入端（IN）和至少一个输出端（OUT）的类型，其间被定义为传递函数（FdT），并被插入一个二次电池 包括一系列跨导级（2,3,4,5）的（18）包括连接在所述二次电池（18）的一对级（2,3）之间的可变电流（iK1，iK2）的发电机电路（29） ）和电压基准（GND）。 所述发生器允许在滤波器（20）的传递函数（FdT）中引入可编程零点。
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公开(公告)号：US5495201A
公开(公告)日：1996-02-27
申请号：US145989
申请日：1993-10-29
CPC分类号： H03F3/45071 , H03F1/3211 , H03H11/0422
摘要： A transconductor stage for high-frequency filters operated on a low voltage supply, being of a type which comprises an input circuit portion having signal inputs, further comprises a pair of interconnected differential cells (2,3) being associated each with a corresponding signal input. Each cell incorporates at least one pair of bipolar transistors (Q1,Q2;Q3,Q4) having at least one corresponding terminal thereof (e.g. the emitter terminal) connected in common.
摘要翻译： 一种用于在低电压电源上工作的高频滤波器的跨导电压级，其包括具有信号输入的输入电路部分的类型，还包括一对互连的差分单元（2,3），其中每一个具有对应的信号输入 。 每个单元包含至少一对具有共同连接的至少一个对应端子（例如发射极端子）的双极晶体管（Q1，Q2; Q3，Q4）。
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9.发明授权Method and apparatus for generating piezoelectric transducer excitation waveforms using a boost converter 有权使用升压转换器产生压电换能器激励波形的方法和装置公开(公告)号：US08854319B1
公开(公告)日：2014-10-07
申请号：US12986905
申请日：2011-01-07
IPC分类号： G06F3/041
CPC分类号： H03K17/964 , G06F3/016 , G06F3/041 , H02M3/33507
摘要： Transducers formed as part of a touchscreen system emulate the motion of a pushbutton or other mechanical elements. A touchscreen system positions a transducer adjacent to an icon displayed on the touchscreen surface. When a user touches the icon, the transducer senses the touch and is then deformed in a pattern that emulates a mechanical motion, giving the user the sensation of touching a mechanical button. An excitation signal applied to the transducer is compared to a target excitation signal that, when applied to the transducer, causes the transducer to emulate the desired motion. When any differences between the two signals are detected, the excitation signal is adjusted so that the motion is corrected. The target excitation signal, or time and voltage segments defining it, are stored in memory and retrieved for comparison. The excitation signal is also selected to reduce any acoustic artifacts that can cause the transducer to generate audible clicks.
摘要翻译： 作为触摸屏系统的一部分形成的传感器模拟按钮或其他机械元件的运动。 触摸屏系统将传感器定位在触摸屏表面上显示的图标附近。 当用户触摸图标时，换能器感测触摸，然后以模拟机械运动的图案变形，给予用户触摸机械按钮的感觉。 将施加到换能器的激励信号与目标激励信号进行比较，当施加到换能器时，其使得换能器模拟期望的运动。 当检测到两个信号之间的任何差异时，调整激励信号以使运动被校正。 目标激励信号或定义它的时间和电压段被存储在存储器中并且被检索用于比较。 还选择激励信号以减少可能导致换能器产生可听见的咔嗒声的任何声学伪影。
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公开(公告)号：US20120250462A1
公开(公告)日：2012-10-04
申请号：US13077252
申请日：2011-03-31
申请人： Luigi Franchini , Roberto Alini , Filippo Cevini
发明人： Luigi Franchini , Roberto Alini , Filippo Cevini
IPC分类号： G01S15/89
CPC分类号： G01S7/52017 , A61B8/56 , A61B8/587 , G01S7/52004 , G01S7/52025 , G01S15/8906
摘要： A transceiver for an ultrasonic imaging device includes a transmit circuit and a receive circuit. The transmit circuit outputs test pulses to a probe including a transducer to generate an image of a test object. A composite signal including the test pulses and a reflected signal is output by the transducer. The receive circuit receives the composite signal including the test pulses and the reflected signal and includes a filter circuit. The filter circuit filters the test pulses from the composite signal and passes the reflected signal. An impedance of the filter circuit is equal to substantially zero when the reflected signal is within a predetermined frequency range.
摘要翻译： 用于超声波成像装置的收发器包括发射电路和接收电路。 发射电路将测试脉冲输出到包括换能器的探针以产生测试对象的图像。 包括测试脉冲和反射信号的复合信号由换能器输出。 接收电路接收包括测试脉冲和反射信号的复合信号，并包括滤波电路。 滤波器电路从复合信号中滤出测试脉冲并传递反射信号。 当反射信号在预定频率范围内时，滤波电路的阻抗基本上等于零。
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