High-speed and high-accuracy digital-to-analog converter

Details High-speed and high-accuracy digital-to-analog converter High-speed and high-accuracy digital-to-analog converter

2007-06-05

2007-06-05

Jeanglaude, Jean Bruner (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

C341S145000, C341S118000

Reexamination Certificate

active

10947980

ABSTRACT:
A high-speed, high-accuracy DAC has multiple current switches. Each current switch includes a current source that provides a reference current, first and second circuit elements that couple to the current source, and first and second transistors that couple to the first and second circuit elements, respectively. The first transistor provides the reference current to a first output when enabled, and the second transistor provides the reference current to a second output when enabled. The first and second circuit elements provide source degeneration for the first and second transistors, extend the linear operating region for these transistors, and may be implemented with either transistors that are always turned on or resistors. The first and second transistors and the first and second circuit elements may be P-channel field effect transistors (P-FETs), N-channel field effect transistors (N-FETs), or transistors of some other type.

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