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"Flat analog" AFE coupled with an all digital architecture compensation read channel

  • US 20090207517A1
  • Filed: 02/15/2008
  • Published: 08/20/2009
  • Est. Priority Date: 02/15/2008
  • Status: Active Grant
First Claim
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1. A system operable to read data from a magnetic storage media comprising:

  • a read head, the read head operable to read data from the magnetic storage media and produce an analog signal;

    a programmable gain amplifier operable to amplify the analog signal, such that the range of the amplified analog signal substantially matches a range of an analog to digital converter (ADC);

    a continuous time anti-aliasing filter to substantially reduce both noise as well as signal energy above half a Baud signaling rate of the system, but otherwise not to substantially equalize or change an analog signals magnitude or phase below half the Baud signaling rate of the system;

    an essentially static offset adjust module operable to center the amplified analog signal to a midscale of the ADC, where no high speed real time adjustments to an analog offset are made based on a detected or estimated transmitted signal, but rather adjustments are made to compensate for slow drifting of the analog offset due to temperature and voltage;

    the ADC operable to sample the amplified analog signal and produce a digital signal;

    a digital processing module operable to produce a compensated digital signal from the digital signal, such compensation comprising at least one function selected from the group comprising;

    correcting analog read channel errors within the digital signal;

    compensating for distortions caused by head type asymmetry; and

    correcting for misequalization or mismatch in magnitude and/or phase between the digitized signal and a desired target for a sequence detector; and

    a sequence detector operable to process the compensated digital signal and detect a bit sequence from the compensated digital signal.

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