High precision DAC with thermometer coding

Details High precision DAC with thermometer coding High precision DAC with thermometer coding

2008-05-06

2008-05-06

Young, Brian (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S145000

Reexamination Certificate

active

11633221

ABSTRACT:
A digital-to-analog converter comprising a digital input; a first thermometer coder for generating a set of first control signals based on a first portion of the digital input; at least one fractional-bit DAC cell controlled by one or more of the first control signals for providing a fractional-bit current based on the first portion of the digital input; at least one second thermometer coder for generating a set of second control signals based on a second portion of the digital input; and at least one multi-bit DAC cell controlled by one or more of the second control signals for providing a multi-bit current based on the second portion of the digital input, wherein the fractional-bit current and the multi-bit current are combined to form an output of the DAC corresponding to the digital input.

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Van Der Plas, et al., “A 14-bit Intrinsic Accuracy Q2 Random Walk CMOS DAC,” IEEE J. of Solid-State Circuits, vol. 34, No. 12, Dec. 1999, pp. 1708.
Jurgen Deveugele et al., “A Gradient-Error and Edge-Effect Tolerant Switching Scheme for a High-Accuracy DAC,” IEEE Transactions on Circuits and Systems, vol. 51, No. 1, Jan. 2004, p. 191.
D. Wouter J. Groeneveld et al., “A Self-Calibration Techniques for monolithic High-Resolution D/A Converters,” ISSCC89, p. 22.
Richard K. Hester et al., CODEC For Echo-Canceling, Full-Rate ADSL Moderns, IEEE J. of Solid-Statue Circuits, vol. 34, No. 12, Dec., 1999.

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