Method and device of reducing harmonic error energy and DAC thereof

Method and device of reducing harmonic error energy and DAC thereof

  • CN 1,835,405 B
  • Filed: 03/15/2005
  • Issued: 11/16/2011
  • Est. Priority Date: 03/15/2005
  • Status: Active Grant
First Claim
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1. a device that reduces harmonic error energy is applicable to a current type self-correcting pseudotype digital to analog converter, comprising:

  • One offset buffer is in order to provide a shift time signal;

    One substep compensates decoder, in order to receiving a digital signal, and this digital signal is done compensation decoding and is exported a compensation decoded signal;

    One shift unit is coupled to this and compensates decoder and this offset buffer step by step, according to this shift time signal this compensation decoded signal is shifted, and export one the displacement after the compensation decoded signal;

    One unitary current array comprises a plurality of unit current sources, and the per unit current source is in order to provide a unitary current;

    One correcting switch network, be coupled to this offset buffer and this unitary current array, according to this a shift time signal and a reference current, come unitary current calibration one by one that the per unit current source is provided, produce an error profile weight, and these unitary currents behind the output calibration, this this compensation decoded signal that compensates decoder is step by step allocated according to described error profile weight;

    AndOne current switch device, be coupled to this shift unit and this correcting switch network, this current switch device comprises a plurality of switches, each switch receives the arbitrary of these unitary currents after proofreading and correct, in order to according to the displacement after this compensation decoded signal, disconnect or conducting these unitary currents after proofreading and correct, these unitary currents after all conductings that add the General Logistics Department with output are proofreaied and correct, and obtain an analog current signal.

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