Digital-to-analog converters with improved linearity

Details Digital-to-analog converters with improved linearity Digital-to-analog converters with improved linearity

1989-06-02

1991-07-30

Shoop, Jr., William M.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341118, 341155, H03M 166

Patent

active

050363220

ABSTRACT:
High accuracy is achieved by employing, in conventional DAC architectures, very accurate current sources. To create these high-accuracy current sources, the outputs of several smaller, less accurate, nominally equal current sources are summed. A procedure is taught for selecting the number of current sources to achieve an arbitrary degree of accuracy with a desired level of confidence. Assuming the current sources are taken from a population whose output currents deviate from a design value according to a normal distribution, the minimum number of constituent current sources, n, required to provide an accurate total current is given by the formula n=(Z.sigma./E).sup.2, where Z is a number which corresponds to the probability that the output will fall within an error band E (i.e., a predetermined accuracy level) with a predetermined level of confidence, .sigma. is the standard deviation of the population.

REFERENCES:
patent: 4492954 (1985-01-01), Harris et al.
patent: 4573005 (1986-02-01), van de Plassche
patent: 4864215 (1989-09-01), Schouwenaars et al.
patent: 4874964 (1989-10-01), Kondo

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