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    RECONFIGURABLE DIGITAL PREDISTORTION CIRCUIT
    51.
    发明申请
    RECONFIGURABLE DIGITAL PREDISTORTION CIRCUIT 审中-公开

    公开(公告)号：US20190312649A1

    公开(公告)日：2019-10-10

    申请号：US16376504

    申请日：2019-04-05

    Applicant: Maxlinear, Inc.

    Inventor： Ioannis Spyropoulos ,  Anand Anandakumar

    IPC: H04B10/564 ,  H04B1/04

    Abstract: A system comprises a digital predistortion circuit comprising: a first quantity of delay circuits configured to delay a signal to be predistorted; a second quantity of filter tap circuits, wherein the second quantity is smaller than the first quantity; and a delay-to-filter-taps mapping circuit that is operable to map each output of a first subset of the delay circuits to a corresponding input of the filter tap circuits. The system may comprise circuitry operable to select which of the first quantity of delay circuits is in the first subset. The selection of which of the first quantity of delay circuits is in the first subset may be based on a temperature measurement. The digital predistortion circuit may comprise cross-term generation circuitry operable to generate cross-term signals corresponding to the cross products of multiple, differently-delayed versions of a signal input to the digital predistortion circuit.

    Hybrid direct-modulated/external modulation optical transceiver
    52.
    发明授权
    Hybrid direct-modulated/external modulation optical transceiver 有权

    公开(公告)号：US10389449B2

    公开(公告)日：2019-08-20

    申请号：US16135338

    申请日：2018-09-19

    Applicant: Maxlinear, Inc.

    Inventor： Curtis Ling ,  Anand Anandakumar ,  Ioannis Spyropoulos

    IPC: H04B10/2507 ,  H04B10/40 ,  H04B10/516 ,  H04B10/58 ,  H04B10/69 ,  H04B10/079 ,  H04B10/2513

    Abstract: Aspects of a method and system for feedback during optical communications are provided. In one embodiment, a system for optical communications comprises a predistortion module, a feedback subsystem, a transmit optical subsystem, and an external modulator. The predistortion module is operable to receive an input digital signal and modify the input digital signal to produce a digital predistorted signal. The transmit optical subsystem is operable to generate an optical signal from the digital predistorted signal. The modification of the input digital signal is dynamically controlled by the feedback subsystem according to one or more characteristics of the optical signal as determined by the feedback subsystem. The amplitude of the external modulator output is also dynamically controlled by the feedback subsystem.

    Method and system for time interleaved analog-to-digital converter timing mismatch estimation and compensation
    53.
    发明授权
    Method and system for time interleaved analog-to-digital converter timing mismatch estimation and compensation 有权

    公开(公告)号：US10326462B2

    公开(公告)日：2019-06-18

    申请号：US16154167

    申请日：2018-10-08

    Applicant: Maxlinear, Inc.

    Inventor： Pawandeep Taluja ,  Mingrui Zhu ,  Xuefeng Chen ,  Anand Anandakumar ,  Sheng Ye ,  Timothy Gallagher

    IPC: H03M1/06 ,  H03M1/50 ,  H03M1/10 ,  H03M1/12 ,  H04L7/00 ,  H04L25/08 ,  H04W56/00

    Abstract: Methods and systems for time interleaved analog-to-digital converter timing mismatch calibration and compensation may include receiving an analog signal on a chip, converting the analog signal to a digital signal utilizing a time interleaved analog-to-digital-converter (ADC), and reducing a blocker signal that is generated by timing offsets in the time interleaved ADC by estimating complex coupling coefficients between a desired digital output signal and the blocker signal utilizing a decorrelation algorithm on frequencies within a desired frequency bandwidth. The decorrelation algorithm may comprise a symmetric adaptive decorrelation algorithm. The received analog signal may be generated by a calibration tone generator on the chip. An aliased signal may be summed with an output signal from a multiplier. The complex coupling coefficients may be determined utilizing the decorrelation algorithm on the summed signals. A multiplier may be configured to cancel the blocker signal utilizing the determined complex coupling coefficients.

    OUTDOOR UNIT RESONATOR CORRECTION
    54.
    发明申请
    OUTDOOR UNIT RESONATOR CORRECTION 审中-公开

    公开(公告)号：US20190068227A1

    公开(公告)日：2019-02-28

    申请号：US16171463

    申请日：2018-10-26

    Applicant: Maxlinear, Inc.

    Inventor： Subramanian Anantharaman Chandrasekarapuram ,  Anand Anandakumar ,  Stephane Laurent-Michel ,  Sheng Ye ,  Raja Pullela ,  Glenn Chang ,  Vamsi Paidi

    IPC: H04B1/10

    Abstract: A system comprises a microwave backhaul outdoor unit having a first resonant circuit, phase error determination circuitry, and phase error compensation circuitry. The first resonant circuit is operable to generate a first signal characterized by a first amount of phase noise and a first amount of temperature stability. The phase error determination circuitry is operable to generate a phase error signal indicative of phase error between the first signal and a second signal, wherein the second signal is characterized by a second amount of phase noise that is greater than the first amount of phase noise, and the second signal is characterized by a second amount of temperature instability that is less than the first amount of temperature instability. The phase error compensation circuitry is operable to adjust the phase of a data signal based on the phase error signal, the adjustment resulting in a phase compensated signal.

    TRANSMIT OPTICAL SUB-ASSEMBLY WITH LOCAL FEEDBACK
    56.
    发明申请
    TRANSMIT OPTICAL SUB-ASSEMBLY WITH LOCAL FEEDBACK 审中-公开

    公开(公告)号：US20180294879A1

    公开(公告)日：2018-10-11

    申请号：US16008758

    申请日：2018-06-14

    Applicant: Maxlinear, Inc.

    Inventor： Anand Anandakumar ,  Ioannis Spyropoulos ,  Curtis Ling

    IPC: H04B10/2507 ,  H04B10/40 ,  H04B10/079 ,  H04B10/58

    Abstract: Aspects of a method and system for feedback during optical communications are provided. In one embodiment, a system for optical communications comprises a digital-to-analog converter (DAC), a driver, and a transmit optical subsystem. The DAC is operable to receive a digital code of a plurality of digital codes and output an analog current signal having an analog current level of a plurality of analog current levels. The driver is operable to condition the analog current signal output from the digital-to-analog converter. The transmit optical subsystem is operable to generate an optical signal from the conditioned analog current signal. A digital modification of an input digital signal is dynamically controlled by a feedback path according to one or more characteristics of the optical signal. The one or more characteristics comprise a nonlinearity that may be temperature dependent.

    METHOD AND SYSTEM FOR RECEIVER CONFIGURATION BASED ON A PRIORI KNOWLEDGE OF NOISE
    57.
    发明申请
    METHOD AND SYSTEM FOR RECEIVER CONFIGURATION BASED ON A PRIORI KNOWLEDGE OF NOISE 审中-公开

    公开(公告)号：US20180234740A1

    公开(公告)日：2018-08-16

    申请号：US15888705

    申请日：2018-02-05

    Applicant: MaxLinear, Inc.

    Inventor： Anand Anandakumar ,  Ioannis Spyropoulos ,  Meetul Parikh

    IPC: H04N21/647 ,  H04N21/438 ,  H04N21/442 ,  H04N21/61

    CPC classification number: H04N21/64738 ,  H04N21/438 ,  H04N21/44209 ,  H04N21/6143

    Abstract: Methods and systems are provided for using priori knowledge of noise in controlling signal receivers. In a signal receiver, one or more adjustments, relating to generating output signals via the signal receiver, may be determined, with the adjustments directed to one or more particular components of the output signals. When applying the adjustments is determined to cause undesired effects on one or more other components of the output signals, with these other components being intended to remain unchanged when the adjustments are applied, operations of the signal receiver may be controlled based on the undesired effects, with the controlling including mitigating at least some of the effects on the one or more other components of the signals when the one or more adjustments are applied. The adjustments may include frequency re-assignment. The undesired effects may include one or more of amplitude glitches, phase glitches, bit or packet errors, etc.

    Non-Coherent Multi-Symbol-Delay Differential Detector
    58.
    发明申请
    Non-Coherent Multi-Symbol-Delay Differential Detector 审中-公开

    公开(公告)号：US20180115441A1

    公开(公告)日：2018-04-26

    申请号：US15839905

    申请日：2017-12-13

    Applicant: Maxlinear, Inc.

    Inventor： Ioannis Spyropoulos ,  Anand Anandakumar

    IPC: H04L25/03 ,  H04B1/16

    CPC classification number: H04L25/03184 ,  H04B1/16

    Abstract: An electronic receiver may generate a differential detection sequence based on a received symbol sequence and based on a m-symbol delayed version of the received symbol sequence, where in is an integer greater than 1. The particular differential detection sequence may be a result of an element-by-element multiplication of the particular received symbol sequence and the conjugate of an in-symbol delayed version of the particular received symbol sequence. The receiver may calculate differential decision metrics based on the differential detection sequence and based on a set of differential symbol sequences generated from the set of possible transmitted symbol sequences. The receiver may generate a decision as to which of a set of possible transmitted symbol sequences resulted in the received symbol sequence, where the decision is based on the differential decision metrics and the set of possible transmitted symbols sequences.

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