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    Reservoir capacitor based analog-to-digital converter
    5.
    发明授权
    Reservoir capacitor based analog-to-digital converter 有权

    公开(公告)号：US10348319B1

    公开(公告)日：2019-07-09

    申请号：US15983658

    申请日：2018-05-18

    Applicant: Analog Devices Global Unlimited Company

    Inventor： Sandeep Monangi ,  Anoop Manissery Kalathil ,  Vinayak Mukund Kulkarni ,  Michael C. W. Coln

    IPC: H03M1/06 ,  H03M1/08

    Abstract: Techniques to use reservoir capacitors in ADC to supply most of the charge to bit-trial capacitors as bit-trials are performed. An accurate reference voltage source, e.g., a reference buffer circuit, only needs to supply the difference, e.g., an inaccuracy, in the charge supplied by the reservoir capacitors. Instead of having to resettle for each bit-trial, the accurate reference voltage source has only to deliver the initial charge to the reservoir capacitors during acquisition and once more when the ADC is ready to sample onto the residue amplifier. These techniques can ease the demands on the reference buffer circuit and requirement of external decoupling capacitors, for example.

    Power-cycling voltage reference
    6.
    发明授权
    Power-cycling voltage reference 有权

    公开(公告)号：US10528070B2

    公开(公告)日：2020-01-07

    申请号：US15969175

    申请日：2018-05-02

    Applicant: Analog Devices Global Unlimited Company

    Inventor： Michael C. W. Coln ,  Michael Mueck ,  Quan Wan ,  Sandeep Monangi

    IPC: G05F3/26 ,  H03F1/30 ,  H03F1/02 ,  H03F3/45 ,  H03M1/12 ,  H03M1/46

    Abstract: A low-noise, low-power reference voltage circuit can include an operational transconductance amplifier (OTA) with inputs coupled to a temperature-compensated voltage, such as can be provided by source-coupled first and second field-effect transistors (FETs) having different threshold voltages. A capacitive voltage divider can feed back a portion of a reference voltage output by the OTA to the inputs of the OTA to help establish or maintain the temperature-compensated voltage across the inputs of the OTA. A switching network can be used, such as initialize the capacitive voltage divider or other capacitive feedback circuit, such as during power-down cycles, or when resuming powered-on cycles. A switch can interrupt current to the OTA during the power-down cycles to save power. The cycled voltage reference circuit can provide a reference voltage to an ADC reservoir capacitor. Powering down can occur during analog input signal sampling, during successive approximation routine (SAR) conversion, or both.

    Integrated circuit with on chip variation reduction
    7.
    发明授权
    Integrated circuit with on chip variation reduction 有权

    公开(公告)号：US10454493B2

    公开(公告)日：2019-10-22

    申请号：US15150910

    申请日：2016-05-10

    Applicant: Analog Devices Global

    Inventor： Dennis A. Dempsey ,  Michael C. W. Coln

    IPC: H03M1/06 ,  H03M1/78 ,  H01L23/34 ,  H01L49/02 ,  H03F3/45 ,  H03M1/74

    Abstract: Many electronic circuits rely on the ratio of one component to other components being well defined. Current flow in component can warm the component causing its electrical properties to change, for example the resistance of a resistor may increase due to self-heating as a result of current flow. The present disclosure provides a way to reduce temperature variation between components so as to reduce electrical mismatch between them or the consequences of such mismatch. This is important as even a change of resistance of, for example, 20-50 ppm in a resistor can result in non-linearity exceeding the least significant bit value of a 16 bit digital to analog converter.

    Voltage reference circuit and method of providing a voltage reference
    8.
    发明授权
    Voltage reference circuit and method of providing a voltage reference 有权

    公开(公告)号：US10218268B1

    公开(公告)日：2019-02-26

    申请号：US15936122

    申请日：2018-03-26

    Applicant: Analog Devices Global Unlimited Company

    Inventor： Maitrey Kamble ,  Michael C. W. Coln ,  Vinayak Mukund Kulkarni

    IPC: H03M1/12 ,  H02M3/07 ,  H03M1/46

    Abstract: The present disclosure relates to a voltage reference circuit and a method of providing a voltage reference. The voltage reference circuit uses a switched capacitor arrangement to move charge between capacitors during different phases of operation of the circuit to which the voltage reference is being provided. The circuit being provided with a voltage reference may be an analog-to-digital converter (ADC). A reservoir capacitor is used to supply the reference voltage. During a phase in which no voltage reference is required, charge is shared between the capacitors of the switched capacitor arrangement, in order to boost the charge on the reservoir capacitor. After charge sharing, the reservoir capacitor is topped up with an output from a reference buffer. The reservoir capacitor may then be used again in the next conversion phase.

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