| 摘要 |
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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