Digital-to-analog converter test method and apparatus

摘要

A method and apparatus for testing the linearity of a digital-to-analog converter that uses equally-weighted signal sources to convert high-order bits of digital input, and unequally-weighted signal sources to convert low-order bits. Minimum and maximum digital inputs are supplied, and a linear input-output characteristic is calculated from the two resulting analog output values. The nonlinearity error is calculated by finding the deviations from this linear input-output characteristic of two sets of analog output values: one set obtained by varying the high-order bits while holding the low-order bits constant; the other set obtained by varying the low-order bits while holding the high-order bits constant.