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公开(公告)号：US20200083873A1
公开(公告)日：2020-03-12
申请号：US16684421
申请日：2019-11-14
Applicant: QUALCOMM Incorporated
Inventor： Zhengzheng WU , Deping HUANG , Jeffrey Mark HINRICHS , Marzio PEDRALI-NOY
Abstract: A sub-ranging time-to-digital converter (TDC) is disclosed that includes two ring oscillators for determining a time difference between two clock edges.
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公开(公告)号：US20210194474A1
公开(公告)日：2021-06-24
申请号：US17022608
申请日：2020-09-16
Applicant: QUALCOMM Incorporated
Inventor： Zhengzheng WU , Xu ZHANG , Xuhao HUANG
Abstract: A method of generating precise and PVT-stable time delay or frequency using CMOS circuits is disclosed. In some implementations, the method includes providing a reference voltage using a resistive module at a positive input terminal of an operational amplifier, coupling gates of a pair of p-type metal oxide semiconductor (pMOS) transistors and a compensation capacitor to an output terminal of the operational amplifier to generate a first bias signal, and coupling a pair of n-type metal oxide semiconductor (nMOS) transistors to a negative terminal of the operational amplifier to generate a second bias signal at the negative terminal, wherein the pair of nMOS transistors is substantially the same as a pair of nMOS transistors in the CMOS delay circuit.
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3.发明申请公开(公告)号：US20220200608A1
公开(公告)日：2022-06-23
申请号：US17125595
申请日：2020-12-17
Applicant: QUALCOMM Incorporated
Inventor： Zhengzheng WU , Chao SONG , Karthik NAGARAJAN
Abstract: A digital phase-frequency detector characterizes a delay between two input clock signals using a ring oscillator. A cycle count of a ring oscillator signal circulating through a loop in the ring oscillator during the delay provides a coarse measurement of the delay. A phase of the ring oscillator signal in the loop at the end of the delay provides a fine measurement of the delay. A digital phase-locked loop may control an oscillation frequency of a digitally-controlled oscillator responsive to the fine measurement of the delay and control a division within a clock divider responsive to the coarse measurement of the delay.
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公开(公告)号：US20220182065A1
公开(公告)日：2022-06-09
申请号：US17449250
申请日：2021-09-28
Applicant: QUALCOMM Incorporated
Inventor： Zhengzheng WU , Chao SONG , Karthik NAGARAJAN
Abstract: A digital-to-time converter (DTC) converts a digital code into a time delay using a capacitor digital-to-analog converter (CDAC) that functions as a charging capacitor. The DTC includes a switched capacitor voltage-to-current converter for the formation of a charging current (or a discharging current) for charging (or for discharging) the charging capacitor responsive to a triggering clock edge that begins the time delay. A comparator compares a voltage on the charging capacitor to a threshold voltage to determine an end of the time delay.
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