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公开(公告)号：US5495166A
公开(公告)日：1996-02-27
申请号：US45465
申请日：1993-04-08
CPC分类号： G05F3/24 , H03K17/145
摘要： A threshold voltage generator for a field-effect transistor, being of a type adapted to compensate for variations of the threshold voltage from a nominal value, comprising a first amplifier having a first input connected to a current generator; a second amplifier connected ahead of a second input of the first amplifier and having an input connected to another current generator; and a third amplifier connected after the first amplifier and having an output adapted to produce the value of said threshold voltage.
摘要翻译： 一种用于场效应晶体管的阈值电压发生器，其类型适于补偿阈值电压与标称值的变化，包括具有连接到电流发生器的第一输入的第一放大器; 连接在第一放大器的第二输入端的第二放大器，并具有连接到另一电流发生器的输入端; 以及连接在所述第一放大器之后并具有适于产生所述阈值电压值的输出端的第三放大器。
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公开(公告)号：US5332937A
公开(公告)日：1994-07-26
申请号：US942678
申请日：1992-09-09
CPC分类号： H03F3/45179 , H03F3/45286 , H03F2203/45024 , H03H11/0433
摘要： A transconductor differential stage for high-frequency filters, which has a MOS differential input pair with common sources. The drain of each MOS input is connected to the emitter of an npn bipolar. These two matched bipolars have their gates connected together with the gate of a third bipolar, which is diode-connected. Two matched current sources feed the two bipolars, and a third current source feeds the third bipolar. A single controlled current sink is connected to the sources of both MOS input transistors, and also (through a resistor) to the third bipolar.
摘要翻译： 用于高频滤波器的跨导差分级，具有通用源的MOS差分输入对。 每个MOS输入的漏极连接到npn双极的发射极。 这两个匹配的双极子的栅极与第二极二极管连接的第三极的栅极连接在一起。 两个匹配的电流源馈送两个双极，第三个电流源馈送第三个双极。 单个受控电流吸收器连接到两个MOS输入晶体管的源极，并且（通过电阻器）连接到第三极。
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公开(公告)号：US5430337A
公开(公告)日：1995-07-04
申请号：US105736
申请日：1993-08-12
CPC分类号： H03F1/3211 , H03F3/45076 , H03F3/45282
摘要： A transconductor stage for high-frequency filters of a type which comprises an input circuit portion having signal inputs and an output circuit portion, incorporates a pair of field-effect transistors having respective gate and source terminals in common, and has the output portion formed of a pair of bipolar transistors connected to the aforesaid field-effect transistors.
摘要翻译： 一种用于包括具有信号输入的输入电路部分和输出电路部分的类型的高频滤波器的跨导级，包括一对共同具有各自的栅极和源极端子的场效应晶体管，并且具有由 连接到上述场效应晶体管的一对双极晶体管。
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公开(公告)号：US5621358A
公开(公告)日：1997-04-15
申请号：US454924
申请日：1995-05-31
CPC分类号： H03F3/45883 , H03F3/45286 , H03F3/45807 , H03G1/0023 , H03F2203/45648
摘要： A controlled gain transconductor (20) which comprises a transconductance stage (3) having at least two input terminals (I1, I2) and at least two output terminals (O1, O2), an active load (4) connected to the output terminals of the transconductance stage and a control circuit (5) for the active load (4) connected between said output terminals (O1, O2) and the active load (4).Also provided is a circuit portion (10) being a replica of the transconductance stage (3), the active load (4) and the control circuit (5). This replicated portion (10) has an output connected to the control circuit (5) of the transconductor (20) to provide a predetermined voltage value (Vc) required for adjusting the DC gain of the device.
摘要翻译： 包括具有至少两个输入端（I1，I2）和至少两个输出端（O1，O2）的跨导级（3）的受控增益跨导体（20），连接到 跨导级和连接在所述输出端子（O1，O2）和有源负载（4）之间的有源负载（4）的控制电路（5）。 还提供了作为跨导级（3），有源负载（4）和控制电路（5）的复制品的电路部分（10）。 该复制部分（10）具有连接到跨导体（20）的控制电路（5）的输出，以提供调整装置的DC增益所需的预定电压值（Vc）。
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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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