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1. 发明授权

US06204729B1 H-bridge power amplifier for a motor 失效
标题翻译：用于电机的H桥功率放大器
公开(公告)号：US06204729B1
公开(公告)日：2001-03-20
申请号：US08994795
申请日：1997-12-19
申请人： Mark K. Takita
发明人： Mark K. Takita
IPC分类号： H03F3217
CPC分类号： H03F3/2173 , H03F3/2171 , H03K17/162
摘要： A highly linear, low-distortion H-bridge amplifier is described. The amplifier includes four interconnected power transistors connected to an inductive load. Each transistor has a precision voltage clamp connected between the source and drain to suppress ringing oscillations. Two or more of the transistors also include high-speed transient-voltage suppressers connected in parallel with their respective voltage clamps. These transient-voltage suppressers do not have the clamping accuracy of the voltage clamps, but respond much more quickly to suppress noise spikes. The amplifier therefore takes advantage of both the fast response time of the transient-voltage suppressers and the precise voltage-clamping characteristics of the voltage clamps.
摘要翻译：描述了高线性，低失真的H桥放大器。放大器包括连接到感性负载的四个互连的功率晶体管。每个晶体管具有连接在源极和漏极之间的精密电压钳，以抑制振荡振荡。两个或多个晶体管还包括与其各自的电压钳并联连接的高速瞬态电压抑制器。这些瞬态电压抑制器不具有电压钳位的钳位精度，但是响应更快以抑制噪声尖峰。因此，放大器利用瞬态电压抑制器的快速响应时间和电压钳的精确的电压钳位特性。

2. 发明授权

US06175272B1 Pulse—width modulation system 失效
标题翻译：脉宽调制系统
公开(公告)号：US06175272B1
公开(公告)日：2001-01-16
申请号：US08994102
申请日：1997-12-19
申请人： Mark K. Takita
发明人： Mark K. Takita
IPC分类号： H03F338
CPC分类号： H03F3/2173 , H03F1/0244 , H03F3/2171 , H03F2200/351
摘要： A high-power PWM system with improved low-power performance and which includes an oscillator configured to provide a substantially periodic signal to a pulse-width modulator. The pulse-width modulator outputs a PWM signal, derived from the analog signal and the periodic signal, on the PWM output node to a high-power amplifier that can select from a number of power-supply voltages. The PWM system improves amplification accuracy at low input signal levels by selecting a reduced power-supply voltage. The pulse width of the PWM signal is increased proportional to the decrease in the power-supply voltage to maintain the gain factor of the system at low power.
摘要翻译：一种具有改进的低功率性能的高功率PWM系统，其包括被配置为向脉冲宽度调制器提供基本周期性信号的振荡器。脉冲宽度调制器将PWM输出节点上的模拟信号和周期信号导出的PWM信号输出到可从多个电源电压中选择的大功率放大器。 PWM系统通过选择降低的电源电压来提高低输入信号电平下的放大精度。 PWM信号的脉冲宽度与电源电压的降低成比例地增加，以将系统的增益系数保持在低功率。

3. 发明授权

US5781068A Transadmittance amplifier for a motor 失效
标题翻译：电动机用导纳放大器
公开(公告)号：US5781068A
公开(公告)日：1998-07-14
申请号：US618235
申请日：1996-03-14
申请人： Mark K. Takita
发明人： Mark K. Takita
IPC分类号： H02P29/00 , H03F1/30 , H03F1/34 , H03F3/347 , H03F3/45
CPC分类号： H03F1/30 , H03F3/347
摘要： A transadmittance amplifier provides an output current that is proportional to an input voltage level. The output current drives a coil of an electric motor (the load) through a sense resistor, the voltage drop across the sense resistor providing an indication of the amount of current flowing through the coil. The indication provided by the sense resistor is applied across the differential input terminals of a feedback amplifier, which responds by outputting a feedback signal proportional to the output current. In one embodiment, the maximum output current is increased by providing a pair of complementary drive amplifiers.
摘要翻译：输电放大器提供与输入电压电平成比例的输出电流。输出电流通过检测电阻驱动电机的线圈（负载），检测电阻两端的电压降提供了流经线圈的电流量的指示。由检测电阻器提供的指示施加在反馈放大器的差分输入端上，反馈放大器通过输出与输出电流成比例的反馈信号进行响应。在一个实施例中，通过提供一对互补驱动放大器来增加最大输出电流。

4. 发明授权

US06392484B1 Amplifier with combined pulsed energy output and linear type output 失效
标题翻译：具有组合脉冲能量输出和线性输出的放大器
公开(公告)号：US06392484B1
公开(公告)日：2002-05-21
申请号：US09628591
申请日：2000-07-31
申请人： Mark K. Takita
发明人： Mark K. Takita
IPC分类号： H03F3217
CPC分类号： H03F3/217 , H03F1/3217 , H03F3/3081
摘要： A single stage amplifier system that produces an accurate linear output signal during low power demands and a pulse modulated output signal during high power demands is disclosed. A control circuit provides a linear signal and a pulsed signal to an output stage in response to a select signal provided by an external circuit. The single output stage includes two transistors in a push-pull arrangement that can be driven in their saturation regions when a pulsed signal is provided by the control circuit or driven within their linear region when a linear signal is provided. The single stage amplifier system can be used in either a half bridge amplifier system or an H-bridge amplifier system.
摘要翻译：公开了一种单级放大器系统，其在低功率需求期间产生精确的线性输出信号，并且在高功率需求期间产生脉冲调制输出信号。控制电路响应于由外部电路提供的选择信号而向输出级提供线性信号和脉冲信号。单个输出级包括推挽装置中的两个晶体管，当提供线性信号时，当由控制电路提供脉冲信号或者在其线性区域内驱动脉冲信号时，该晶体管可在其饱和区域中被驱动。单级放大器系统可用于半桥放大器系统或H桥放大器系统。

5. 发明授权

US6147421A Platform positionable in at least three degrees of freedom by interaction with coils 有权
标题翻译：平台可通过与线圈的相互作用至少三个自由度定位
公开(公告)号：US6147421A
公开(公告)日：2000-11-14
申请号：US192637
申请日：1998-11-16
申请人： Mark K. Takita , W. Thomas Novak , Andrew J. Hazelton
发明人： Mark K. Takita , W. Thomas Novak , Andrew J. Hazelton
IPC分类号： G03F7/20 , H02K41/03 , H02K41/00
CPC分类号： G03F7/70758 , H02K41/03 , H02K2201/18
摘要： The invention comprises a platform positionable in at least three degrees of freedom at least partly by interaction with coils. The platform includes a support member having a surface. Magnets are attached to the surface and part of a magnet bearing is attached to the support member. Inner and outer platforms are coupled to each other by magnet bearings and interact with coils to position the inner platform in six degrees of freedom. The invention may be particularly useful in precise positioning of semiconductor wafers and materials during photolithography and other processing.
摘要翻译：本发明包括至少部分地通过与线圈相互作用而至少三个自由度定位的平台。平台包括具有表面的支撑构件。磁体连接到表面，并且磁体轴承的一部分附接到支撑构件。内平台和外平台通过磁铁轴承彼此联接，并与线圈相互作用，以使内平台处于六自由度。在光刻和其它处理期间，本发明可以特别适用于半导体晶片和材料的精确定位。

6. 发明授权

US6064259A High power, high performance pulse width modulation amplifier 失效
标题翻译：大功率，高性能脉宽调制放大器
公开(公告)号：US6064259A
公开(公告)日：2000-05-16
申请号：US121931
申请日：1998-07-24
申请人： Mark K. Takita
发明人： Mark K. Takita
IPC分类号： H03F3/217 , H03F3/38
CPC分类号： H03F3/38 , H03F3/2173
摘要： A high performance pulse width modulation amplifier system employing an H-bridge amplifier connected to a carrier wave output filter produces a pulsed wave signal with high power transfer efficiency and low total harmonic distortion characteristics. A carrier wave output filter used with the pulse width modulation amplifier system produces little peak resonance at low frequencies.
摘要翻译：采用连接到载波输出滤波器的H桥放大器的高性能脉宽调制放大器系统产生具有高功率传输效率和低总谐波失真特性的脉冲波信号。与脉宽调制放大器系统一起使用的载波输出滤波器在低频下产生小的峰值共振。

7. 发明授权

US5990751A Method and apparatus for improving power transfer efficiency of an amplifier system 失效
标题翻译：用于提高放大器系统的功率传递效率的方法和装置
公开(公告)号：US5990751A
公开(公告)日：1999-11-23
申请号：US951774
申请日：1997-10-16
申请人： Mark K. Takita
发明人： Mark K. Takita
IPC分类号： H03F1/02 , H03F3/38
CPC分类号： H03F1/0222
摘要： A linear amplifier provides an output signal that is proportional to an input signal. A differential voltage control unit tracks the output signal voltage and controls the outputs of two pulse width modulators which drive a linear amplifier. The differential voltage control unit controls the output of the positive pulse width modulator to a fixed predetermined value in accordance with at least one of the input or output signals. The positive and negative pulse width modulators are driven by a positive and negative high voltage direct current power supplies respectively.
摘要翻译：线性放大器提供与输入信号成比例的输出信号。差分电压控制单元跟踪输出信号电压并控制驱动线性放大器的两个脉宽调制器的输出。差分电压控制单元根据输入或输出信号中的至少一个将正脉宽调制器的输出控制到固定的预定值。正和负脉冲宽度调制器分别由正和负高压直流电源驱动。

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