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14 条记录 (耗时 0.018 秒)

    METHOD OF TRIMMING CURRENT SOURCE USING ON-CHIP ADC
    11.
    发明申请
    METHOD OF TRIMMING CURRENT SOURCE USING ON-CHIP ADC 有权
    使用片上ADC研究电流源的方法

    公开(公告)号：US20150362942A1

    公开(公告)日：2015-12-17

    申请号：US14307472

    申请日：2014-06-17

    申请人： Siddhartha Gopal Krishna ,  Vikram Varma

    发明人： Siddhartha Gopal Krishna ,  Vikram Varma

    IPC分类号： G05F3/02 ,  H03M1/12

    CPC分类号： C05F3/02 ,  G05F3/02 ,  H03M1/12 ,  H03M1/48 ,  Y02A40/206 ,  Y02P20/145

    摘要： A method of trimming a current source in an IC includes deriving a reference voltage from an external supply, and developing a measurement voltage across an external reference resistance receiving the current to be trimmed. An on-chip ADC is used to provide corresponding digital reference and digital measurement signals. A digital comparator compares the digital signals and provides a digital trim signal, which is used to adjust the current to be trimmed until the digital measurement signal is equal to the digital reference signal within an acceptable tolerance. Gain and offset errors in the ADC cancel and do not affect the calibration of the trim operation.

    摘要翻译： 在IC中修整电流源的方法包括从外部电源导出参考电压，以及跨接在待修整电流上的外部参考电阻产生测量电压。 片上ADC用于提供相应的数字参考和数字测量信号。 数字比较器比较数字信号并提供数字微调信号，用于调整要修整的电流，直到数字测量信号等于可接受公差内的数字参考信号。 ADC中的增益和偏移误差取消，不影响校正操作的校准。

    METHOD AND SYSTEM TO COMPENSATE FOR TEMPERATURE AND PRESSURE IN PIEZO RESISTIVE DEVICES
    12.
    发明申请
    METHOD AND SYSTEM TO COMPENSATE FOR TEMPERATURE AND PRESSURE IN PIEZO RESISTIVE DEVICES 有权
    在PIEZO电阻器件中补偿温度和压力的方法和系统

    公开(公告)号：US20140182353A1

    公开(公告)日：2014-07-03

    申请号：US14197221

    申请日：2014-03-05

    申请人： Siddhartha Gopal Krishna ,  Chad S. Dawson ,  Vikram Varma

    发明人： Siddhartha Gopal Krishna ,  Chad S. Dawson ,  Vikram Varma

    IPC分类号： G01L27/00

    CPC分类号： G01L27/005 ,  G01L9/065 ,  G01L27/002

    摘要： A method and system to calibrate temperature and pressure in piezo resistive devices for non-linear sensors having two variables, where a piezo resistive device such as a piezo resistive transducer (PRT) used for example in a pressure sensor system is calibrated to calculate actual/ambient temperature and pressure even though the PRT impedance is unbalanced relative to pressure.

    摘要翻译： 一种用于校准具有两个变量的非线性传感器的压电器件中的温度和压力的方法和系统，其中压电电阻器件例如压力传感器系统中使用的压阻式换能器（PRT）被校准以计算实际/ 环境温度和压力即使PRT阻抗相对于压力不平衡。

    SAR ADC providing digital codes with high accuracy and high throughput performance
    14.
    发明授权
    SAR ADC providing digital codes with high accuracy and high throughput performance 有权
    SAR ADC提供高精度和高吞吐量性能的数字代码

    公开(公告)号：US06958722B1

    公开(公告)日：2005-10-25

    申请号：US10709996

    申请日：2004-06-11

    申请人： Seetharaman Janakiraman ,  Vikram Varma ,  Yujendra Mitikiri

    发明人： Seetharaman Janakiraman ,  Vikram Varma ,  Yujendra Mitikiri

    IPC分类号： H03M1/14 ,  H03M1/38 ,  H03M1/46

    CPC分类号： H03M1/144 ,  H03M1/145 ,  H03M1/468

    摘要： An aspect of the invention improves accuracy of digital codes generated at the output of a SAR ADC by using multiple reference voltages. A first reference voltage is used to generate an equivalent voltage corresponding to previous resolved bits and a second reference voltage is used to generate equivalent voltage corresponding to the bits being presently resolved. Another aspect of the present invention provides an ADC with high SNR as well as high throughput performance. Such a feature may be achieved by resolving some of the MSBs of the digital code using a high speed and low SNR DAC and remaining bits of the digital code using a high SNR DAC.

    摘要翻译： 本发明的一个方面通过使用多个参考电压来提高在SAR ADC的输出处产生的数字代码的精度。 使用第一参考电压来产生对应于先前分辨的位的等效电压，并且使用第二参考电压来产生对应于当前解析的位的等效电压。 本发明的另一方面提供了一种具有高信噪比和高吞吐量性能的ADC。 这样的特征可以通过使用高SNR和低SNR DAC解析数字码的一些MSB而使用高SNR DAC来解析数字码的剩余位来实现。