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71. 发明申请

US20050238123A1 Method and system for charge sensing with variable gain, offset compensation, and demodulation 有权
标题翻译：具有可变增益，偏移补偿和解调的电荷感测方法和系统
公开(公告)号：US20050238123A1
公开(公告)日：2005-10-27
申请号：US11115226
申请日：2005-04-27
申请人： Sumant Ranganathan , Tom Kwan , Hung-Sung Li
发明人： Sumant Ranganathan , Tom Kwan , Hung-Sung Li
IPC分类号： G01D5/24 , G01L9/12 , G01P15/125 , H04L27/06
CPC分类号： G01D5/24 , G01L9/12 , G01P15/125
摘要： Provided are a method and system for digitizing a sensor model output signal. The system includes a filter, a demodulator coupled to the filter, a DC offset cancellation mechanism coupled to the demodulator, and an analog to digital converter (ADC). The ADC is directly coupled to the demodulator and the DC offset cancellation mechanism.
摘要翻译：提供了一种用于数字化传感器模型输出信号的方法和系统。该系统包括滤波器，耦合到滤波器的解调器，耦合到解调器的DC偏移消除机构，以及模数转换器（ADC）。 ADC直接耦合到解调器和DC偏移消除机制。

72. 发明申请

US20050057283A1 Sample and hold circuit based on an ultra linear switch 有权
标题翻译：基于超线性开关的采样和保持电路
公开(公告)号：US20050057283A1
公开(公告)日：2005-03-17
申请号：US10927416
申请日：2004-08-27
申请人： Sumant Ranganathan
发明人： Sumant Ranganathan
IPC分类号： G11C27/02 , H03K5/00 , H03K17/06 , H03K17/687 , H03K17/693
CPC分类号： H03K17/063 , G11C27/02 , H03K17/6872 , H03K17/693
摘要： A sample and hold circuit including a plurality of input signal sampling switches using native NMOS transistors in combination with switched bulk PMOS transistors. The input signal sampling switches input a differential input signal and output an intermediate differential signal. A plurality of capacitors are connected to the intermediate differential signal. A plurality of summing junction switches receive charge stored on the plurality of capacitors, and output a differential sampled and held charge to the summing junction. The plurality of input signal sampling switches include first, second, third, and fourth switches each having an input and an output. Inputs of the first and third switches are connected to a first voltage of the differential input voltage. Inputs of the second and fourth switches are connected to a second voltage of the differential input voltage. Outputs of the first and second switches are connected together and to an input of a first capacitor of the plurality of capacitors. Outputs of the third and fourth switches are connected together and to an input of a second capacitor of the plurality of capacitors.
摘要翻译：采样和保持电路包括使用天然NMOS晶体管与开关体PMOS晶体管组合的多个输入信号采样开关。输入信号采样开关输入差分输入信号并输出中间差分信号。多个电容器连接到中间差分信号。多个求和结开关接收存储在多个电容器上的电荷，并且向加法结输出差分采样和保持的电荷。多个输入信号采样开关包括具有输入和输出的第一，第二，第三和第四开关。第一和第三开关的输入端连接到差分输入电压的第一电压。第二和第四开关的输入连接到差分输入电压的第二电压。第一和第二开关的输出端连接在一起并连接到多个电容器的第一电容器的输入端。第三和第四开关的输出端连接在一起并连接到多个电容器的第二电容器的输入端。

73. 发明申请

US20050046460A1 Amplifier compensation techniques for switched capacitor circuits 失效
标题翻译：开关电容电路的放大器补偿技术
公开(公告)号：US20050046460A1
公开(公告)日：2005-03-03
申请号：US10835401
申请日：2004-04-30
申请人： Sumant Ranganathan
发明人： Sumant Ranganathan
IPC分类号： G06G7/18 , H03F1/34 , H03F3/00 , H03F3/45
CPC分类号： H03F3/005 , H03F1/34 , H03F3/45475 , H03F2200/159 , H03F2203/45514
摘要： A system and method are used to maintain a variance in feedback factors of an amplifier between the first and second phases either below a threshold value or within a specified range. The system includes the amplifier and first through third capacitances. The amplifier is coupled between an input node and an output node that operates during first and second phases of operation. The first capacitance is coupled across the amplifier and between the input node and the output node during the first and second phases of operation. The second capacitance is coupled to the input node during the first phase of operation. The third capacitance is coupled to one of the input and output nodes during one or both of the first and second phases of operation.
摘要翻译：使用系统和方法来维持第一和第二相之间的放大器的反馈因子的差异，或者低于阈值或在指定范围内。该系统包括放大器和第一至第三电容。放大器耦合在输入节点和在第一和第二操作阶段期间操作的输出节点。在操作的第一和第二阶段期间，第一电容跨越放大器并且在输入节点和输出节点之间耦合。第二电容在第一阶段操作期间耦合到输入节点。在操作的第一和第二阶段中的一个或两个期间，第三电容耦合到输入和输出节点中的一个。

74. 发明授权

US06756847B2 Operational amplifier with increased common mode input range 有权
公开(公告)号：US06756847B2
公开(公告)日：2004-06-29
申请号：US10373576
申请日：2003-02-26
申请人： Eric B. Blecker , Sumant Ranganathan
发明人： Eric B. Blecker , Sumant Ranganathan
IPC分类号： H03F345
CPC分类号： H03F3/4565 , H03F3/45183 , H03F2203/45366
摘要： An operational amplifier includes a first stage with a first differential transistor pair inputting a differential input signal at their gates, a first tail current source transistor connected to sources of the first differential transistor pair, and a load transistor pair connected in series with the drain of first differential transistor pair. An input stage includes a second differential transistor pair connected to respective drains of the first differential transistor pair at their gates, and a second tail current transistor connected to sources of the differential transistor pair. An output stage outputs a signal corresponding to the differential input signal.

75. 发明授权

US06639438B2 Apparatus and method for communication link having parallel signal detect with hysteresis 失效
标题翻译：具有滞后的并行信号检测的通信链路的装置和方法
公开(公告)号：US06639438B2
公开(公告)日：2003-10-28
申请号：US09895998
申请日：2001-06-30
申请人： Robert C. Glenn , Sumant Ranganathan
发明人： Robert C. Glenn , Sumant Ranganathan
IPC分类号： H03L700
CPC分类号： H04L25/06
摘要： A method is described that involves directing a signal through a hysteresis comparator. Then, determining if an output signal of the hysteresis comparator, in response to the signal, is an AC signal or a DC signal. Then, deactivating a signal reception unit that receives the signal if the hysteresis comparator output signal corresponds to a DC signal; or, activating the signal reception unit if the hysteresis comparator output signal corresponds to an AC signal.
摘要翻译：描述了一种涉及通过滞后比较器引导信号的方法。然后，响应于该信号确定迟滞比较器的输出信号是AC信号还是DC信号。然后，如果滞后比较器输出信号对应于DC信号，则去激活接收信号的信号接收单元; 或者如果滞后比较器输出信号对应于AC信号，则激活信号接收单元。

76. 发明授权

US08988367B2 Systems and methods for providing enhanced touch sensing 有权
标题翻译：提供增强触摸感应的系统和方法
公开(公告)号：US08988367B2
公开(公告)日：2015-03-24
申请号：US13020613
申请日：2011-02-03
申请人： John Walley , Robert Lukas , David Sobel , Sumant Ranganathan , Tianhao Li
发明人： John Walley , Robert Lukas , David Sobel , Sumant Ranganathan , Tianhao Li
IPC分类号： G06F3/041 , G06F3/044 , G06F3/045 , G06F1/32
CPC分类号： G06F3/0416 , G06F1/3262 , G06F3/044 , G06F3/045 , G06F2203/04106
摘要： Provided are systems and methods for providing enhanced touch sensing. One system providing enhanced touch sensing includes a multi-mode touch screen and a processor configured to apply at least one test signal to a sense element of the multi-mode touch screen, detect at least one return signal from the sense element, and then determine a relative position of an object corresponding to the at least one return signal, the multi-mode touch screen being capable of sensing the first object using first and second detection modes. One multi-mode touch screen comprises a multi-mode multi-touch touch screen. One processor is configured to apply an adaptive test signal to a sense element of a touch screen.
摘要翻译：提供了用于提供增强的触摸感测的系统和方法。提供增强的触摸感测的一个系统包括多模式触摸屏和被配置为向多模式触摸屏的感测元件施加至少一个测试信号的处理器，从感测元件检测至少一个返回信号，然后确定对应于至少一个返回信号的物体的相对位置，多模式触摸屏能够使用第一和第二检测模式来感测第一物体。一个多模式触摸屏包括多模式多点触摸触摸屏。一个处理器被配置为将自适应测试信号应用于触摸屏的感测元件。

77. 发明授权

US08208462B2 Line driver for an adaptive hybrid circuit 有权
标题翻译：自适应混合电路的线路驱动器
公开(公告)号：US08208462B2
公开(公告)日：2012-06-26
申请号：US12497337
申请日：2009-07-02
申请人： Tom Kwan , Sumant Ranganathan
发明人： Tom Kwan , Sumant Ranganathan
IPC分类号： H04B3/23 , H04M9/08
CPC分类号： H04L5/1423 , H04L25/0278
摘要： A second output transmission signal (“TX2”) added to a line driver is a scaled version of the main output transmission signal (“TX1”). TX2 is scaled from TX1 by a variable scale factor K. An adaptive hybrid circuit subtracts TX1 and TX2 from a line signal carrying both a line transmission signal and a line received signal (“RX”). A programmable impedance Ztune is coupled between the TX2 output of the line driver and the RX output of the adaptive hybrid circuit. A transmission echo in the output RX signal is measured. K and Ztune are then adaptively tuned to minimize the transmission echo. The hybrid in this case becomes a 4-port network, one port specifically added to adaptively cancel the transmission echo in the RX output of the adaptive hybrid circuit. Alternatively, the hybrid may be a 3-port hybrid including variable impedances to cancel the line transmission signal.
摘要翻译：添加到线路驱动器的第二输出发送信号（“TX2”）是主输出发送信号（“TX1”）的缩放版本。 TX2通过可变比例因子K从TX1缩放。自适应混合电路从携带线路传输信号和线路接收信号（“RX”）的线路信号中减去TX1和TX2。可编程阻抗Ztune耦合在线路驱动器的TX2输出和自适应混合电路的RX输出之间。测量输出RX信号中的传输回波。然后自适应调整K和Ztune以最小化传输回波。在这种情况下，混合器成为一个4端口网络，一个专门添加的端口自适应地消除了自适应混合电路的RX输出中的传输回波。或者，混合动力可以是包括可变阻抗以消除线路传输信号的3端口混合器。

78. 发明申请

US20070279040A1 On-chip current sensing methods and systems 有权
标题翻译：片上电流检测方法和系统
公开(公告)号：US20070279040A1
公开(公告)日：2007-12-06
申请号：US11707023
申请日：2007-02-16
申请人： Sumant Ranganathan , Zhou Lin
发明人： Sumant Ranganathan , Zhou Lin
IPC分类号： G01R19/10
CPC分类号： G01R19/0092 , H03K17/0822
摘要： A switch regulator module includes a switch and a current sensing module. The switch has an input port and an output port. The current sensing module senses a first voltage at the input port of the switch and a second voltage at the output port of the switch. The current sensing module generates a sense signal that is proportional to a current that flows through the switch based on the first and second voltages.
摘要翻译：开关调节器模块包括开关和电流感测模块。交换机有一个输入端口和一个输出端口。电流感测模块感测开关的输入端口处的第一电压和开关输出端口处的第二电压。电流感测模块基于第一和第二电压产生与流过开关的电流成正比的感测信号。

79. 发明授权

US07282991B2 On-chip amplifier/line driver compensation circuit 有权
标题翻译：片内放大器/线路驱动器补偿电路
公开(公告)号：US07282991B2
公开(公告)日：2007-10-16
申请号：US10887869
申请日：2004-07-12
申请人： Sumant Ranganathan
发明人： Sumant Ranganathan
IPC分类号： H03F3/45
CPC分类号： H03F1/08
摘要： An embodiment of the present invention includes an amplifier on an integrated circuit, with the amplifier having positive and negative inputs, and positive and negative outputs. A first feedback capacitor is on the integrated circuit between the positive input and the negative output. A second feedback capacitor is on the integrated circuit between the negative input and the positive output. A package encloses the integrated circuit. A third capacitor is between the positive and negative inputs. A feedback factor of the amplifier circuit approaches unity. In example embodiments, the first and second capacitors are between 3 and 10 pF. The third capacitor is between 3 and 10 pF.
摘要翻译：本发明的实施例包括集成电路上的放大器，放大器具有正和负输入以及正和负输出。在正输入和负输出之间的集成电路上有第一个反馈电容。负输入和正输出之间的集成电路上有第二个反馈电容。封装封装集成电路。第三个电容在正极和负极之间。放大器电路的反馈系数接近一致。在示例实施例中，第一和第二电容器在3和10pF之间。第三电容器在3和10 pF之间。

80. 发明授权

US07119585B2 Sample and hold circuit based on an ultra linear switch 有权
标题翻译：基于超线性开关的采样和保持电路
公开(公告)号：US07119585B2
公开(公告)日：2006-10-10
申请号：US10927416
申请日：2004-08-27
申请人： Sumant Ranganathan
发明人： Sumant Ranganathan
IPC分类号： G11C27/02
CPC分类号： H03K17/063 , G11C27/02 , H03K17/6872 , H03K17/693
摘要： A sample and hold circuit including a plurality of input signal sampling switches using native NMOS transistors in combination with switched bulk PMOS transistors. The input signal sampling switches input a differential input signal and output an intermediate differential signal. A plurality of capacitors are connected to the intermediate differential signal. A plurality of summing junction switches receive charge stored on the plurality of capacitors, and output a differential sampled and held charge to the summing junction. The plurality of input signal sampling switches include first, second, third, and fourth switches each having an input and an output. Inputs of the first and third switches are connected to a first voltage of the differential input voltage. Inputs of the second and fourth switches are connected to a second voltage of the differential input voltage. Outputs of the first and second switches are connected together and to an input of a first capacitor of the plurality of capacitors. Outputs of the third and fourth switches are connected together and to an input of a second capacitor of the plurality of capacitors.
摘要翻译：采样和保持电路包括使用天然NMOS晶体管与开关体PMOS晶体管组合的多个输入信号采样开关。输入信号采样开关输入差分输入信号并输出中间差分信号。多个电容器连接到中间差分信号。多个求和结开关接收存储在多个电容器上的电荷，并且向加法结输出差分采样和保持的电荷。多个输入信号采样开关包括具有输入和输出的第一，第二，第三和第四开关。第一和第三开关的输入端连接到差分输入电压的第一电压。第二和第四开关的输入连接到差分输入电压的第二电压。第一和第二开关的输出端连接在一起并连接到多个电容器的第一电容器的输入端。第三和第四开关的输出端连接在一起并连接到多个电容器的第二电容器的输入端。

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