A precise DA converter realised with imprecise resistors
نویسندگان
چکیده
In the 2R/R converters imprecision of resistors introduces two types of error. Positive errors introduce a gap in the analog domain, while negative errors cause non-monotonicity in the input/output characteristics. Changing the resistor ratio from 2R/R to 2R/R, with R>R, we intentionally introduce an additional negative error in order to avoid resulting positive error gap. In this paper we propose a simple calibration of such 2R/R converter. Simulation results confirm that even with resistors tolerance of few percents we can achieve a converter with error as low as one hundredth of a percent of full scale. Key-Words: 2R/R converter, input/output characteristics, gap, calibration, max INL.
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