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Integrated cable modem

  • US 9,560,420 B2
  • Filed: 11/04/2013
  • Issued: 01/31/2017
  • Est. Priority Date: 05/21/2004
  • Status: Active Grant
First Claim
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1. An integrated cable modem, comprising:

  • a down-conversion circuit configured to down-convert a downstream signal in accordance with a quadrature local oscillator signal to generate a plurality of down-converted components;

    a multiplexer configured to interleave the plurality of down-converted components;

    an analog-to-digital converter (ADC), coupled to an output of the multiplexer, configured to convert the interleaved plurality of down-converted components into a single data stream;

    a demodulator circuit configured to generate a plurality of digital outputs based on the single data stream; and

    an oscillator circuit coupled to an output of the demodulator circuit and to an input of the down-conversion circuit, and wherein the oscillator circuit is configured to;

    receive an error signal that is generated based on the plurality of digital outputs,adjust a quadrature component of the quadrature local oscillator signal based on the error signal, andsend the adjusted quadrature local oscillator signal to the down-conversion circuit.

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