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Extremely-fine resolution sub-ranging current mode Digital-Analog-Converter using Sigma-Delta modulators

  • US 10,425,099 B1
  • Filed: 11/29/2018
  • Issued: 09/24/2019
  • Est. Priority Date: 11/29/2018
  • Status: Active Grant
First Claim
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1. A X-bit Digital-to-Analog Converter (DAC) circuit comprising:

  • an effective X/2-bit coarse DAC configured to produce a coarse bitstream (CBS) from a digital input DC1 using an nth order Sigma-Delta (Σ

    Δ

    ) modulator, and to provide a coarse current source based on the CBS, wherein X is an even integer and n is an integer;

    an effective X/2-bit fine DAC configured to produce a fine bitstream (FBS) from a digital input DC2 using a 1st order Σ

    Δ

    modulator, and to provide a fine current source based on the FBS; and

    an output configured to form a voltage from the combination of the coarse current source and the fine current source.

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