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DACs without continuous clocking are often favored in applications such as medical imaging and scientific instrumentation. The DACs in these high-precision systems are commonly endpoint-calibrated. After this calibration, a non-ideal DAC contributes three main sources of error: noise, temperature drift, and INL. The segmented voltage-mode R-2R DAC is an attractive architecture for reducing the first...
This paper presents a 20b clockless DAC designed for precision calibrated systems. The architecture is a 6b parallel resistor voltage divider with a 14b R-2R subDAC. This architecture is inherently good for noise and temperature stability. Major causes of nonlinearity are discussed. A single current-output calibration DAC corrects for both random resistor mismatch and systematic resistor nonlinearity...
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