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    LOW VOLTAGE CRYSTAL OSCILLATOR (XTAL) DRIVER WITH FEEDBACK CONTROLLED DUTY CYCLING FOR ULTRA LOW POWER
    3.
    发明申请
    LOW VOLTAGE CRYSTAL OSCILLATOR (XTAL) DRIVER WITH FEEDBACK CONTROLLED DUTY CYCLING FOR ULTRA LOW POWER 有权
    低电压晶体振荡器（XTAL）驱动器，具有反馈控制的超低功耗循环

    公开(公告)号：US20150214894A1

    公开(公告)日：2015-07-30

    申请号：US14594814

    申请日：2015-01-12

    Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

    Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

    IPC: H03B5/36

    CPC classification number: H03B5/364 ,  H03B5/04 ,  H03B5/32 ,  H03B2200/0012 ,  H03B2200/0046 ,  H03B2200/0064 ,  H03B2200/0082 ,  H03L5/00

    Abstract: A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The amplifier of a XTAL oscillator can be duty cycled to save power, e.g., the XTAL driver can be turned off to save power when the amplitude of the XTAL oscillation reaches a maximum value in range; but be turned back on when the amplitude of the XTAL oscillation starts to decay, to maintain the oscillation before it stops. In addition or alternatively, a feedback control scheme to duty cycle the amplifier of a XTAL oscillator can be used to monitor the amplitude of the oscillation.

    Abstract translation: 具有反馈控制占空比的低电压晶体振荡器（XTAL）驱动器，用于超低功耗偏置用于子阈值操作状态下XTAL的放大器。 可以使用反馈控制方案来偏置放大器以在子阈值操作状态下偏置的XTAL。 XTAL振荡器的放大器可以循环使用以节省功率，例如，当XTAL振荡的幅度达到范围内的最大值时，可以关闭XTAL驱动器以节省功率; 但是当XTAL振荡的振幅开始衰减时，重新开启，以便在停止之前保持振荡。 另外或替代地，可以使用用于对XTAL振荡器的放大器进行占空比的反馈控制方案来监视振荡的幅度。

    Low power clock source
    4.
    发明授权
    Low power clock source 有权
    低功率时钟源

    公开(公告)号：US09590638B2

    公开(公告)日：2017-03-07

    申请号：US14426571

    申请日：2013-09-06

    Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

    Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

    IPC: H03L1/02 ,  G06F1/04 ,  H03B5/32

    CPC classification number: H03L1/026 ,  G06F1/04 ,  G06F1/324 ,  G06F1/3287 ,  G06F1/3296 ,  H03B5/32 ,  H03K3/011 ,  H03K3/0315 ,  H03L1/02 ,  H03L1/021 ,  H03L1/022

    Abstract: An ultra-low power clock source includes a compensated oscillator and an uncompensated oscillator coupled by a comparator circuit. In an example, the compensated oscillator is more stable than the uncompensated oscillator with respect to changes in one or more of temperature, voltage, age, or other environmental parameters. The uncompensated oscillator includes a configuration input configured to adjust an operating characteristic of the uncompensated oscillator. In an example, the uncompensated oscillator is adjusted using information from the comparator circuit about a comparison of output signals from the compensated oscillator and the uncompensated oscillator.

    Abstract translation: 超低功率时钟源包括补偿振荡器和由比较器电路耦合的未补偿振荡器。 在一个示例中，相对于温度，电压，年龄或其他环境参数中的一个或多个的变化，补偿振荡器比未补偿的振荡器更稳定。 无补偿振荡器包括配置为调整未补偿振荡器的工作特性的配置输入。 在一个示例中，使用来自比较器电路的信息来调整来自补偿振荡器和未补偿振荡器的输出信号的比较的未补偿振荡器。

    Low input voltage boost converter with peak inductor current control and offset compensated zero detection
    6.
    发明授权
    Low input voltage boost converter with peak inductor current control and offset compensated zero detection 有权
    低输入电压升压转换器，具有峰值电感电流控制和偏移补偿零检测

    公开(公告)号：US09325240B2

    公开(公告)日：2016-04-26

    申请号：US14600425

    申请日：2015-01-20

    Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

    Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

    IPC: G05F1/56 ,  H02M3/158 ,  G05F1/565 ,  G05F1/46 ,  H02M1/00

    CPC classification number: H02M3/158 ,  G05F1/462 ,  G05F1/565 ,  H02M1/088 ,  H02M3/156 ,  H02M2001/0025

    Abstract: The low input voltage boost converter with peak inductor current control and offset compensated zero detection provide a boost converter scheme to harvest energy from sources with small output voltages. Some embodiments described herein includes a thermoelectric boost converter that combines an IPEAK control scheme with offset compensation and duty cycled comparators to enable energy harvesting from TEG inputs as low as 5 mV to 10 mV, and the peak inductor current is independent to first order of the input voltage and output voltage. A control circuit can be configured to sample the input voltage (VIN) and then generate a pulse with a duration inversely proportional to VIN so as to control the boost converter switches such that a substantially constant peak inductor current is generated.

    Abstract translation: 具有峰值电感电流控制和偏移补偿零检测的低输入电压升压转换器提供了一种升压转换器方案，用于从具有小输出电压的电源收集能量。 本文描述的一些实施例包括将IPEAK控制方案与偏移补偿和负载循环比较器组合的热电升压转换器，以使能够从低至5mV至10mV的TEG输入能量收集，并且峰值电感器电流独立于 输入电压和输出电压。 控制电路可以被配置为对输入电压（VIN）进行采样，然后产生具有与VIN成反比的持续时间的脉冲，以便控制升压转换器开关，使得产生基本恒定的峰值电感电流。

    Methods and apparatus for a single inductor multiple output (SIMO) DC-DC converter circuit
    7.
    发明授权
    Methods and apparatus for a single inductor multiple output (SIMO) DC-DC converter circuit 有权

    公开(公告)号：US10170990B2

    公开(公告)日：2019-01-01

    申请号：US15640745

    申请日：2017-07-03

    Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

    Inventor： Benton H Calhoun ,  Aatmesh Shrivastava

    IPC: H02M3/158 ,  H02M1/00

    Abstract: In some embodiments, an apparatus includes a single-inductor multiple-output (SIMO) direct current (DC-DC) converter circuit, with the SIMO DC-DC converter circuit having a set of output nodes. The apparatus also includes a panoptic dynamic voltage scaling (PDVS) circuit operatively coupled to the SIMO DC-DC converter circuit, where the PDVS circuit has a set of operational blocks with each operational block from the set of operational blocks drawing power from one supply voltage rail from a set of supply voltage rails. Additionally, each output node from the set of output nodes is uniquely associated with a supply voltage rail from the set of supply voltage rails.

    LOW VOLTAGE CRYSTAL OSCILLATOR (XTAL) DRIVER WITH FEEDBACK CONTROLLED DUTY CYCLING FOR ULTRA LOW POWER
    10.
    发明申请
    LOW VOLTAGE CRYSTAL OSCILLATOR (XTAL) DRIVER WITH FEEDBACK CONTROLLED DUTY CYCLING FOR ULTRA LOW POWER 审中-公开
    低电压晶体振荡器（XTAL）驱动器，具有反馈控制的超低功耗循环

    公开(公告)号：US20170033740A1

    公开(公告)日：2017-02-02

    申请号：US15161521

    申请日：2016-05-23

    Applicant: UNIVERSITY OF VIRGINIA PATENT FOUNDATION

    Inventor： Benton H. Calhoun ,  Aatmesh Shrivastava

    IPC: H03B5/36

    CPC classification number: H03B5/364 ,  H03B5/04 ,  H03B5/32 ,  H03B2200/0012 ,  H03B2200/0046 ,  H03B2200/0064 ,  H03B2200/0082 ,  H03L5/00

    Abstract: A low voltage crystal oscillator (XTAL) driver with feedback controlled duty cycling for ultra low power biases an amplifier for an XTAL in the sub-threshold operating regime. A feedback control scheme can be used to bias the amplifier for an XTAL biased in the sub-threshold operating regime. The amplifier of a XTAL oscillator can be duty cycled to save power, e.g., the XTAL driver can be turned off to save power when the amplitude of the XTAL oscillation reaches a maximum value in range; but be turned back on when the amplitude of the XTAL oscillation starts to decay, to maintain the oscillation before it stops. In addition or alternatively, a feedback control scheme to duty cycle the amplifier of a XTAL oscillator can be used to monitor the amplitude of the oscillation.

    Abstract translation: 具有反馈控制占空比的低电压晶体振荡器（XTAL）驱动器，用于超低功耗偏置用于子阈值操作状态下XTAL的放大器。 可以使用反馈控制方案来偏置放大器以在子阈值操作状态下偏置的XTAL。 XTAL振荡器的放大器可以循环使用以节省功率，例如，当XTAL振荡的幅度达到范围内的最大值时，可以关闭XTAL驱动器以节省功率; 但是当XTAL振荡的振幅开始衰减时，重新开启，以便在停止之前保持振荡。 另外或替代地，可以使用用于对XTAL振荡器的放大器进行占空比的反馈控制方案来监视振荡的幅度。

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