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METHOD AND APPARATUS FOR SENSING A CURREN FOR VARYING IMPEDANCE LOADS

  • US 20120044020A1
  • Filed: 08/23/2010
  • Published: 02/23/2012
  • Est. Priority Date: 08/23/2010
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • a class-D amplifier having a low-side recycling mode, a pair of low-side NMOS transistors, and a pair of output terminals;

    a sample-and-hold (S/H) that is coupled to the pair of output terminals, wherein the S/H circuit samples a voltage on each of the pair of output terminals of the class-D amplifier when its associated low-side NMOS transistor is actuated;

    a current generator that is coupled to the S/H circuit, wherein the current generator uses the voltages on the pair of output terminals sampled by the S/H circuit to minor the drain-source voltages of the pair of low-side NMOS transistors on a pair of sense transistors, and wherein the drain-source voltages mirrored on the pair of sense transistors generates a pair of sense currents; and

    a current-to-voltage (I-to-V) converter that is coupled to the current generator so as to convert the sense currents to a sense voltage.

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