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39 条记录 (耗时 0.024 秒)

    Multiple output digital-to-analog converter
    1.
    发明授权
    Multiple output digital-to-analog converter 有权
    多路输出数/模转换器

    公开(公告)号：US06278393B1

    公开(公告)日：2001-08-21

    申请号：US09372892

    申请日：1999-08-12

    申请人： Douglas D. Lopata ,  Malcolm Harold Smith

    发明人： Douglas D. Lopata ,  Malcolm Harold Smith

    IPC分类号： H03M166

    CPC分类号： H03M1/662 ,  H03M1/765

    摘要： There is disclosed an integrated circuit including a digital-to-analog converter in which a resistor string is adapted to be coupled to a reference source. The resistor string includes a plurality of serially coupled impedances defining intermediate taps at the junctions thereof. A first plurality of switches are coupled between a first output node and respective ones of the intermediate taps. A first selection circuit receives a first digitally coded signal and is coupled to each switch in the first plurality of switches. The first selection circuit selectively switches the first plurality of switches to predetermined states depending upon a first digitally coded signal provided thereto, to generate a first analog output. A second plurality of switches are coupled between a second output node and respective ones of the intermediate taps. A second selection circuit coupled to each switch in the second plurality of switches selectively switches the second plurality of switches to predetermined states depending upon a second digitally coded signal provided thereto, to generate a second analog output.

    摘要翻译： 公开了一种包括数模转换器的集成电路，其中电阻器串适于耦合到参考源。 电阻串包括多个串联耦合的阻抗，在其接点处限定中间抽头。 第一多个开关耦合在第一输出节点和相应的中间抽头之间。 第一选择电路接收第一数字编码信号，并且耦合到第一多个开关中的每个开关。 第一选择电路根据提供给其的第一数字编码信号选择性地将第一多个开关切换到预定状态，以产生第一模拟输出。 第二多个开关耦合在第二输出节点和相应的中间抽头之间。 耦合到第二多个开关中的每个开关的第二选择电路根据提供给其的第二数字编码信号选择性地将第二多个开关切换到预定状态，以产生第二模拟输出。

    Baseband receiver including dual port DAC
    2.
    发明授权
    Baseband receiver including dual port DAC 有权
    基带接收器包括双端口DAC

    公开(公告)号：US06424284B1

    公开(公告)日：2002-07-23

    申请号：US09653570

    申请日：2000-08-31

    申请人： Douglas D. Lopata ,  Malcolm Harold Smith

    发明人： Douglas D. Lopata ,  Malcolm Harold Smith

    IPC分类号： H03M138

    CPC分类号： H04B1/0032 ,  H03M1/46 ,  H03M1/662 ,  H03M1/765 ,  H04B1/0003 ,  H04B1/30

    摘要： A baseband receiver particularly well-suited for wireless applications utilizes a dual-port DAC in a successive-approximation ADC, where the dual-port DAC replaces the separate pair of single port conventional DACs and is therefore shared by the I and Q down-converted components. The use of a dual-port DAC results in significant size and power savings over conventional arrangements.

    摘要翻译： 特别适用于无线应用的基带接收器在逐次逼近ADC中使用双端口DAC，其中双端口DAC替代单独的一对单端口常规DAC，因此由I和Q下转换 组件。 与常规布置相比，双端口DAC的使用导致显着的尺寸和功率节省。

    Dynamic input stage biasing for low quiescent current amplifiers
    3.
    发明授权
    Dynamic input stage biasing for low quiescent current amplifiers 有权
    低静态电流放大器的动态输入级偏置

    公开(公告)号：US06509722B2

    公开(公告)日：2003-01-21

    申请号：US09846844

    申请日：2001-05-01

    申请人： Douglas D. Lopata

    发明人： Douglas D. Lopata

    IPC分类号： G05F140

    CPC分类号： H03F3/45183 ,  G05F1/565 ,  H03F2203/45454 ,  H03F2203/45462 ,  H03F2203/45466

    摘要： An amplifier, for use in regulator circuits and other applications, having dynamic input stage biasing includes an input stage operatively coupled to an input of the amplifier. A controlled current source coupled to the input stage is responsive to a control signal for at least partially controlling an input bias current generated by the controlled current source. The amplifier further includes a sense circuit operatively connected in a feedback arrangement between an output of the amplifier and the controlled current source. The sense circuit measures an output load current from the amplifier and generates the control signal in response thereto, whereby the input bias current is a function of the output load current of the amplifier. In this manner, parasitic poles associated with the amplifier are pushed out in frequency so as to provide superior amplifier stability while dissipating low quiescent current, particularly at low output load current levels.

    摘要翻译： 用于具有动态输入级偏置的调节器电路和其它应用中的放大器包括可操作地耦合到放大器的输入的输入级。 耦合到输入级的受控电流源响应于至少部分地控制由受控电流源产生的输入偏置电流的控制信号。 该放大器进一步包括感测电路，其以放大器的输出端与受控电流源之间的反馈装置可操作地连接。 感测电路测量来自放大器的输出负载电流并响应于此产生控制信号，由此输入偏置电流是放大器的输出负载电流的函数。 以这种方式，与放大器相关联的寄生极被频率推出，以便在消散低静态电流的同时提供优异的放大器稳定性，特别是在低输出负载电流水平。

    Recessible integrated pocket clip for mobile devices and the like
    4.
    发明授权
    Recessible integrated pocket clip for mobile devices and the like 有权
    用于移动设备的隐形综合口袋夹等

    公开(公告)号：US08374661B2

    公开(公告)日：2013-02-12

    申请号：US12743035

    申请日：2007-12-18

    申请人： Roger A. Fratti ,  Douglas D. Lopata ,  Lawrence A. Rigge

    发明人： Roger A. Fratti ,  Douglas D. Lopata ,  Lawrence A. Rigge

    IPC分类号： H04M1/00

    CPC分类号： A45F5/02 ,  A45F5/021 ,  A45F2200/0516 ,  H01H3/16

    摘要： In one embodiment, an apparatus comprising a housing and a fastener, such as a clip (101, 201) for fastening the apparatus (100, 200) to an article of clothing. The housing (102, 202) has a recess (103, 203) formed therein, such that at least a portion of the fastener is adapted to fit within the recess. The fastener is adapted to travel slidably within the recess (103, 203) between a first position in which the fastener enables the apparatus (100, 200) to be fastened to an external object and a second position in which the fastener is stowed away.

    摘要翻译： 在一个实施例中，一种包括壳体和紧固件的装置，例如用于将装置（100,200）紧固到衣物上的夹子（101,201）。 壳体（102,202）具有形成在其中的凹部（103,203），使得紧固件的至少一部分适于装配在凹部内。 紧固件适于在第一位置和第二位置之间在凹部（103,203）内滑动地移动，第一位置中紧固件使得装置（100,200）能够紧固到外部物体，并且第二位置中紧固件被收起。

    Power converter with power switch operable in controlled current mode
    5.
    发明授权
    Power converter with power switch operable in controlled current mode 有权
    电源转换器，电源开关可在受控电流模式下工作

    公开(公告)号：US08154261B2

    公开(公告)日：2012-04-10

    申请号：US12707420

    申请日：2010-02-17

    申请人： Douglas D. Lopata ,  Ashraf W. Lotfi

    发明人： Douglas D. Lopata ,  Ashraf W. Lotfi

    IPC分类号： G05F1/613 ,  G05F1/00

    CPC分类号： H02M3/1588 ,  Y02B70/1466

    摘要： A power converter and method of controlling a power switch therein to improve power conversion efficiency at low output current. In one embodiment, the power converter includes a first power switch coupled to a source of electrical power and a second power switch coupled to the first power switch and to an output terminal of the power converter. The power converter also includes a controller configured to alternately enable conduction of the first and the second power switches with a duty cycle in response to an output characteristic of the power converter. The controller is configured to control a level of current in the first power switch when the second power switch is substantially disabled to conduct.

    摘要翻译： 一种功率转换器及其中的电源开关的控制方法，以提高低输出电流下的功率转换效率。 在一个实施例中，功率转换器包括耦合到电源的第一功率开关和耦合到第一功率开关和功率转换器的输出端的第二功率开关。 功率转换器还包括控制器，其被配置为响应于功率转换器的输出特性，以占空比交替地使第一和第二功率开关导通。 控制器被配置为当第二电源开关基本上禁用导通时，控制第一电源开关中的电流电平。

    Software based thermal charging regulation loop
    6.
    发明授权
    Software based thermal charging regulation loop 有权
    基于软件的热充电调节回路

    公开(公告)号：US07944180B2

    公开(公告)日：2011-05-17

    申请号：US12766133

    申请日：2010-04-23

    申请人： Douglas D. Lopata

    发明人： Douglas D. Lopata

    IPC分类号： H02J7/04 ,  H02J7/00 ,  H04M1/00

    CPC分类号： H02J7/0088 ,  H02J7/0029

    摘要： The present invention implements a software controlled thermal feedback system for battery charging circuitry in portable devices, specifically in cellular telephones. The charging hardware block is integrated into a mixed-signal analog base-band (ABB) circuit. In addition to standard function controls, integrated within the ABB are silicon temperature sensors used to monitor the temperature of any silicon components integrated on the ABB and detect any temperature change due to thermal heating. The temperature value is passed to the digital base band (DBB) circuit. Here, a microcontroller is programmed to perform power management functions relating to the ABB. Thermal control software, implemented on the DBB microcontroller, monitors the silicon temperature of the ABB and adjusts the power levels on the ABB accordingly to provide a controlled chip temperature.

    摘要翻译： 本发明实现了便携式设备中的电池充电电路的软件控制热反馈系统，特别是在蜂窝电话中。 充电硬件块集成到混合信号模拟基带（ABB）电路中。 除了ABB内部集成的标准功能控制器，硅温度传感器用于监测ABB集成的任何硅部件的温度，并检测由于热加热引起的任何温度变化。 温度值传递给数字基带（DBB）电路。 这里，微控制器被编程为执行与ABB有关的电源管理功能。 在DBB微控制器上实现的热控制软件监控ABB的硅温度，并相应调整ABB的功率电平，以提供受控的芯片温度。

    Switched-current oscillator for clock-frequency spreading
    8.
    发明授权
    Switched-current oscillator for clock-frequency spreading 有权
    用于时钟频率扩展的开关电流振荡器

    公开(公告)号：US07504897B2

    公开(公告)日：2009-03-17

    申请号：US11589351

    申请日：2006-10-30

    申请人： Chaitanya Chava ,  Douglas D. Lopata

    发明人： Chaitanya Chava ,  Douglas D. Lopata

    IPC分类号： H03B29/00

    CPC分类号： H03K4/502

    摘要： A switched-current oscillator having a dc current source adapted to charge a capacitor so that the capacitor charging time is controlled based on a sequence of (pseudo)randomly selected values, each of those values defining a corresponding charging time. A discharge device is adapted to discharge the capacitor if the voltage across the capacitor reaches a threshold voltage, at which point the next value in the sequence is selected to determine the next charging time. A square-wave clock signal having spread-spectrum characteristics is generated in the oscillator by using the series of charge-discharge cycles corresponding to the sequence of randomly selected values to toggle a flip-flop operating as a delay line and zero-order hold.

    摘要翻译： 一种开关电流振荡器，其具有适于对电容器充电的直流电流源，使得基于（伪）随机选择值的序列控制电容器充电时间，这些值中的每一个定义相应的充电时间。 如果电容器两端的电压达到阈值电压，则放电装置适于对电容器进行放电，此时选择该序列中的下一个值以确定下一个充电时间。 具有扩频特性的方波时钟信号通过使用与随机选择值对应的一系列充放电循环在振荡器中产生，以触发作为延迟线和零级保持的触发器。

    Software based thermal charging regulation loop
    9.
    发明申请
    Software based thermal charging regulation loop 有权
    基于软件的热充电调节回路

    公开(公告)号：US20080054853A1

    公开(公告)日：2008-03-06

    申请号：US11511607

    申请日：2006-08-29

    申请人： Douglas D. Lopata

    发明人： Douglas D. Lopata

    IPC分类号： H02J7/04

    CPC分类号： H02J7/0088 ,  H02J7/0029

    摘要： The present invention implements a software controlled thermal feedback system for battery charging circuitry in portable devices, specifically in cellular telephones. The charging hardware block is integrated into a mixed-signal analog base-band (ABB) circuit. In addition to standard function controls, integrated within the ABB are silicon temperature sensors used to monitor the temperature of any silicon components integrated on the ABB and detect any temperature change due to thermal heating. The temperature value is passed to the digital base band (DBB) circuit. Here, a microcontroller is programmed to perform power management functions relating to the ABB. Thermal control software, implemented on the DBB microcontroller, monitors the silicon temperature of the ABB and adjusts the power levels on the ABB accordingly to provide a controlled chip temperature.

    摘要翻译： 本发明实现了便携式设备中的电池充电电路的软件控制热反馈系统，特别是在蜂窝电话中。 充电硬件块集成到混合信号模拟基带（ABB）电路中。 除了ABB内部集成的标准功能控制器，硅温度传感器用于监测ABB集成的任何硅部件的温度，并检测由于热加热引起的任何温度变化。 温度值传递给数字基带（DBB）电路。 这里，微控制器被编程为执行与ABB有关的电源管理功能。 在DBB微控制器上实现的热控制软件监控ABB的硅温度，并相应调整ABB的功率电平，以提供受控的芯片温度。