Zero-cross-pre-distortion (ZCPD) algorithm for DTC based polar DTx

    公开(公告)号:US10027356B2

    公开(公告)日:2018-07-17

    申请号:US15274509

    申请日:2016-09-23

    Abstract: Devices and methods of compensating for a bandpass filter are generally described. A DTx includes a BPF from which an output signal is produced and a DFE having a zero crossing (ZC) pre-distorter (ZCPD). The ZCPD compensates for ZC distortion from a desired analog signal caused by the BPF. The ZCPD adjusts a DTC code word to generate a DTx output signal to be applied to the BPF. The compensation is dependent on a magnitude of the square wave immediately prior to and after the ZC. The compensated DTC and a DPA code word are used to generate the DTx output signal. The compensation produced by the ZCPD is free from compensation for non-linear responses to the DTC and DPA code words.

    DPLL WITH ADJUSTABLE DELAY IN INTEGER OPERATION MODE

    公开(公告)号:US20200067513A1

    公开(公告)日:2020-02-27

    申请号:US16465515

    申请日:2016-12-30

    Abstract: Aspects of a digital phase-lock loop (DPLL) with an adjustable delay between an output clock and a reference clock in accordance with phase noise compensation are generally described herein. An apparatus may include processing circuitry configured to, in a first mode, identify a delay element of a plurality of delay elements based on an associated delay value, and set an initial phase difference value to a phase difference value associated with the identified delay element. The processor circuitry may be further configured to, in a second mode, in a second mode, initialize the DPLL using the initial phase difference value, determine a phase error between a reference clock and a feedback clock based on the initial phase difference value, adjust an output clock signal based on the phase error.

    Methods and arrangements for spur estimation of a wireless communication packet

    公开(公告)号:US09698863B2

    公开(公告)日:2017-07-04

    申请号:US14229812

    申请日:2014-03-28

    CPC classification number: H04B1/7101 H04B1/1027 H04L25/06 H04W84/12

    Abstract: Logic for spur estimation of a wireless communication packet. Logic may receive an input signal output by a set of analog-to-digital converters and determine means of sequences for each of the analog-to-digital converters. The sequences may be from a preamble of the wireless communication packet. The sequences may comprise a set of short training sequences with an average zero mean received after logic detects a boundary of the sequences. The set of short training sequences may comprise a Golay sequence Ga and a Golay sequence −Ga. Logic may determine spur estimations for each of the analog-to-digital converters based upon a frequency offset estimation for the wireless communication packet. Logic may remove a mean of the spur estimations from the spur estimations. And logic may remove the spur estimations from the packet.

    ZERO-CROSS-PRE-DISTORTION (ZCPD) ALGORITHM FOR DTC BASED POLAR DTX

    公开(公告)号:US20180091177A1

    公开(公告)日:2018-03-29

    申请号:US15274509

    申请日:2016-09-23

    CPC classification number: H04B1/0475 H04B2001/0425 H04L27/367

    Abstract: Devices and methods of compensating for a bandpass filter are generally described. A DTx includes a BPF from which an output signal is produced and a DFE having a zero crossing (ZC) pre-distorter (ZCPD). The ZCPD compensates for ZC distortion from a desired analog signal caused by the BPF. The ZCPD adjusts a DTC code word to generate a DTx output signal to be applied to the BPF. The compensation is dependent on a magnitude of the square wave immediately prior to and after the ZC. The compensated DTC and a DPA code word are used to generate the DTx output signal. The compensation produced by the ZCPD is free from compensation for non-linear responses to the DTC and DPA code words.

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