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    USING PMOS POWER SWITCH IN A COMBINATION SWITCHING AND LINEAR REGULATOR
    3.
    发明公开
    USING PMOS POWER SWITCH IN A COMBINATION SWITCHING AND LINEAR REGULATOR 审中-公开
    在组合开关和线性调节器中使用PMOS电源开关

    公开(公告)号：EP3269029A1

    公开(公告)日：2018-01-17

    申请号：EP16710644.2

    申请日：2016-03-11

    申请人： Microchip Technology Incorporated

    发明人： KUMAR, Ajay

    IPC分类号： H02M3/155 ,  H02M3/156

    摘要： A P-MOS transistor may be used as either a switch in a DC-DC converter or as a pass transistor of a linear regulator. When a supply voltage is above a certain voltage, the P-MOS transistor will be used in the DC-DC converter and when below the certain voltage the P-MOS transistor will be used in the linear regulator. The supply voltage may be monitored with a voltage comparator that compares the supply voltage to the certain voltage. Above the certain voltage the DC-DC converter is more efficient than the linear regulator and below the certain voltage the linear voltage regulator is more efficient than the DC-DC converter. Alternatively, selecting either the DC-DC converter or linear regulator may be done by using bonding, a jumper, a fuse link or programming a bit for different product applications during integrated circuit package fabrication or end product manufacturing.

    SUCCESSIVE-APPROXIMATION-REGISTER (SAR) ANALOG-TO-DIGITAL CONVERTER (ADC) ATTENUATION CAPACITOR CALIBRATION METHOD AND APPARATUS
    4.
    发明公开
    SUCCESSIVE-APPROXIMATION-REGISTER (SAR) ANALOG-TO-DIGITAL CONVERTER (ADC) ATTENUATION CAPACITOR CALIBRATION METHOD AND APPARATUS 审中-公开
    校准和，一种对SAR模数转换器电容损失

    公开(公告)号：EP2965433A1

    公开(公告)日：2016-01-13

    申请号：EP14714025.5

    申请日：2014-03-06

    申请人： Microchip Technology Incorporated

    发明人： KUMAR, Ajay

    IPC分类号： H03M1/10 ,  H03M1/68 ,  H03M1/46 ,  H03M1/80

    摘要： A fixed capacitor is coupled between a top plate of an attenuation capacitor and a variable voltage reference. The error in the attenuation capacitor may be calibrated out with the variable voltage reference and the fixed correction capacitor. The variable voltage reference varies the charge on the attenuation capacitor and thereby compensates for error(s) therein. A calibration digital-to-analog converter may be used in conjunction with or substituted for the variable voltage reference, and may be programmed for different charge compensation values from the SAR logic during an iterative SAR DAC capacitive switching process.

    PERIODIC KICKSTARTER FOR A CRYSTAL OSCILLATOR
    8.
    发明公开
    PERIODIC KICKSTARTER FOR A CRYSTAL OSCILLATOR 审中-公开
    定期的KICKSTARTER为晶体振荡器

    公开(公告)号：EP3311491A1

    公开(公告)日：2018-04-25

    申请号：EP16739607.6

    申请日：2016-06-21

    申请人： Microchip Technology Incorporated

    发明人： KUMAR, Ajay

    IPC分类号： H03L3/00 ,  H03B5/06 ,  H03B7/06

    CPC分类号： H03B5/06 ,  H03B5/364 ,  H03B5/366 ,  H03B2200/0094 ,  H03K3/02337 ,  H03K21/38 ,  H03L3/00

    摘要： A cyclical pulsing oscillator having a pulse repetition rate close to a crystal resonant frequency in an oscillator provides more useful start-up energy to the crystal oscillator circuit and thus provides much faster start-up time. The start-up pulsing oscillator runs for a number of cycles or until the crystal oscillator amplitude as built up to a desired value. The pulsing oscillator may have a repetition rate of from about one-third to about one-half the crystal resonant frequency, thus providing more useful start-up energy to the crystal oscillator circuit.