TIME-TO-DIGITAL CONVERTER AND DIGITAL PHASE-LOCKED LOOP CIRCUIT COMPRISING THE SAME

    公开(公告)号:US20230163768A1

    公开(公告)日:2023-05-25

    申请号:US17885844

    申请日:2022-08-11

    CPC classification number: H03L7/0992 H03L7/0995 H03L7/093 H03M1/1014

    Abstract: Provided is a time-to-digital converter, comprising a phase frequency detector configured to receive a phase-locked loop input clock and a feedback clock, a ring oscillator configured to perform oscillation with multi-phase clocks of a first period, a counter array configured to count the number of oscillations in which the ring oscillator oscillates in a first period by the number of positive integers during the first pulse width, a multiplexer configured to divide the first period into a plurality of zones using edge information of the multi-phase clocks of the ring oscillator, and selects and outputs voltage information of a plurality of neighboring phase clocks included in a first zone from the plurality of zones, an analog-to-digital converter, a calibrator, and a first adder, wherein the calibrator comprises, an offset lookup table generation circuit, a gain-corrected analog-to-digital conversion output generator, and a second adder.

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