公开(公告)号：US20060125576A1

公开(公告)日：2006-06-15

申请号：US11251197

申请日：2005-10-15

Applicant: Gavin Ho ,  Farrokh Ayazi ,  Siavash Pourkamali ,  Krishnakumar Sundaresan

Inventor： Gavin Ho ,  Farrokh Ayazi ,  Siavash Pourkamali ,  Krishnakumar Sundaresan

IPC: H03H9/00

CPC classification number: H03B5/30 ,  H03H9/02244 ,  H03H9/02338 ,  H03H9/2463 ,  H03H9/462 ,  H03H9/505 ,  H03H2009/02496

Abstract: Disclosed are capacitive micromechanical resonators optimized for high Q, low motional impedance, and large tuning range. Exemplary resonators were fabricated using a HARPSS-on-SOI process, and demonstrated quality factors up to 119000 in vacuum. For resonators operating between 3 MHz and 30 MHz, the lowest extracted impedance is 218 kΩ and the largest electrostatic tuning coefficient is −240 ppm/V2. The disclosed designs are applicable up to at least 200 MHz operation. An oscillator interface circuit comprising of a trans-impedance amplifier and an automatic bias generator providing a temperature-compensating bias voltage is also disclosed. Experiments show temperature drift reduction from 2800 ppm to 39 ppm over a 100° C. range. Process compensation (DFM) of micromechanical resonators, resonators having mass loading elements that allow generation of closely spaced frequencies, and coupled systems comprising of the resonators are also described.

Abstract translation: 公开了针对高Q，低运动阻抗和大调谐范围进行了优化的电容微机械谐振器。 使用HARPSS-on-SOI工艺制造了示例性谐振器，并在真空中显示出高达119000的质量因子。 对于在3 MHz和30 MHz之间工作的谐振器，最低提取阻抗为218 kOmega，最大静电调谐系数为-240 ppm / V 2。 所公开的设计可应用于至少200MHz的操作。 还公开了一种包括跨阻放大器和提供温度补偿偏置电压的自动偏置发生器的振荡器接口电路。 实验显示在100°C范围内，温度从2800ppm降至39ppm。 还描述了微机械谐振器的工艺补偿（DFM），具有允许产生紧密间隔的频率的质量负载元件的谐振器以及包括谐振器的耦合系统。

公开(公告)号：US20140005546A1

公开(公告)日：2014-01-02

申请号：US13537109

申请日：2012-06-29

Applicant: Bruno Hans Haider ,  Krishnakumar Sundaresan ,  Boris Constantine Joesaar

Inventor： Bruno Hans Haider ,  Krishnakumar Sundaresan ,  Boris Constantine Joesaar

IPC: A61B8/14

CPC classification number: A61B8/58 ,  A61B8/546

Abstract: A temperature management system and a method of monitoring temperature in an ultrasound imaging system is provided. The system includes an ultrasound probe. The ultrasound probe includes at least one ultrasound transducer and a plurality of application specific integrated circuits. Further, the system includes at least one temperature sensing device disposed on at least one of the plurality of application specific integrated circuits. The temperature sensing devices are disposed in such a way that the sensing devices are in thermal contact with at least one heat producing region of the ultrasound probe.

Abstract translation: 提供了一种超声成像系统中的温度管理系统和温度监视方法。 该系统包括超声波探头。 超声探头包括至少一个超声换能器和多个专用集成电路。 此外，该系统包括设置在多个专用集成电路中的至少一个的至少一个温度感测装置。 温度感测装置以这样的方式设置，使得感测装置与超声波探头的至少一个发热区域热接触。

公开(公告)号：US08508240B2

公开(公告)日：2013-08-13

申请号：US13070294

申请日：2011-03-23

Applicant: Krishnakumar Sundaresan ,  Naresh Kesavan Rao ,  Alexander Seth Ross

Inventor： Krishnakumar Sundaresan ,  Naresh Kesavan Rao ,  Alexander Seth Ross

IPC: G01R27/04

CPC classification number: A61B5/0536

Abstract: A system and method for soft-field tomography data acquisition are provided. One system includes a plurality of transducers that correspond to a plurality of channels, and an excitation driver coupled to generate excitation signals for the plurality of transducers. The system also includes a single reference excitation source from which excitations are generated and one or more derived excitation sources. The one or more derived excitation sources derive excitations from the single reference excitation source that are applied to each of the plurality of channels. The system further includes a response detector and a reduced bit digitizer in each of the plurality of channels configured to digitize a measured response difference between the measured response at one or more of the transducers and at least one of an excitation of the single reference excitation source or an excitation derived from the single reference excitation source or a separate reference.

Abstract translation: 提供了一种用于软磁场层析成像数据采集的系统和方法。 一个系统包括对应于多个通道的多个换能器以及耦合以产生多个换能器的激励信号的激励驱动器。 该系统还包括从其产生激发的单个参考激励源和一个或多个衍生的激发源。 所述一个或多个导出的激发源从施加到多个通道中的每一个的单个参考激励源得到激励。 该系统还包括多个通道中的每个通道中的响应检测器和减少的位数字化器，其被配置为数字化在一个或多个换能器处测量的响应之间的测量的响应差和单个参考激励源的激励中的至少一个 或源自单个参考激励源的激励或单独的参考。

公开(公告)号：US08484599B2

公开(公告)日：2013-07-09

申请号：US13362583

申请日：2012-01-31

Applicant: Krishnakumar Sundaresan

Inventor： Krishnakumar Sundaresan

IPC: G06F17/50

CPC classification number: G06F17/5036 ,  G06F17/5068

Abstract: Systems and techniques for performing parasitic extraction on a via array are described. If the via array is a single row or column via array, the system identifies a first via and a last via in the via array, and merges a set of vias between the first via and the last via into a center via. If the via array is a M×N (M≧2, N≧2) via array, the system merges the vias as follows: the first row and the last row of vias in the via array into a first row via and a last row via, respectively; the first column and the last column of vias in the via array into a first column via and a last column via, respectively; and a set of vias between the first and last rows and the first and last columns into a center via.

Abstract translation: 描述了在通孔阵列上执行寄生提取的系统和技术。 如果通孔阵列是通过阵列的单行或列，则系统识别通孔阵列中的第一通孔和最后一个通孔，并将第一通孔和最后通孔之间的一组通孔合并到中心通孔中。 如果通孔阵列是通过阵列的M×N（M> = 2，N> = 2），则系统将通孔合并如下：通孔阵列中的第一行和通孔的最后一行进入第一行via， 分别是最后一行via 通孔阵列中的第一列和最后一列通孔分别插入第一列通孔和最后一列通孔; 以及在第一行和最后一行之间的一组通孔和第一列和最后一列进入中心通道。

公开(公告)号：US20120242350A1

公开(公告)日：2012-09-27

申请号：US13070294

申请日：2011-03-23

Applicant: Krishnakumar Sundaresan ,  Naresh Kesavan Rao ,  Alexander Seth Ross

Inventor： Krishnakumar Sundaresan ,  Naresh Kesavan Rao ,  Alexander Seth Ross

IPC: G01R27/04

CPC classification number: A61B5/0536

Abstract: A system and method for soft-field tomography data acquisition are provided. One system includes a plurality of transducers that correspond to a plurality of channels, and an excitation driver coupled to generate excitation signals for the plurality of transducers. The system also includes a single reference excitation source from which excitations are generated and one or more derived excitation sources. The one or more derived excitation sources derive excitations from the single reference excitation source that are applied to each of the plurality of channels. The system further includes a response detector and a reduced bit digitizer in each of the plurality of channels configured to digitize a measured response difference between the measured response at one or more of the transducers and at least one of an excitation of the single reference excitation source or an excitation derived from the single reference excitation source or a separate reference.

Abstract translation: 提供了一种用于软磁场层析成像数据采集的系统和方法。 一个系统包括对应于多个通道的多个换能器以及耦合以产生多个换能器的激励信号的激励驱动器。 该系统还包括从其产生激发的单个参考激励源和一个或多个衍生的激发源。 所述一个或多个导出的激发源从施加到多个通道中的每一个的单个参考激励源得到激励。 该系统还包括多个通道中的每个通道中的响应检测器和减少的位数字化器，其被配置为数字化在一个或多个换能器处测量的响应之间的测量的响应差和单个参考激励源的激励中的至少一个 或源自单个参考激励源的激励或单独的参考。