Method for testing nonlinearity error of high speed digital-to-analog converter
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The embodiments are described in detail in cooperation with the drawings to demonstrate the technical contents of the present invention.
Refer to FIG. 2 and FIG. 3 for the sampling theorem of the present invention. Suppose that f(ωt) is the waveform output by a digital-to-analog converter (DAC) 10 and that the waveform has a period of T. Three sampling points p1, p2 and p3, which are originally sampled from a single cycle, are respectively arranged in three different cycles. Respectively define the time difference and voltage difference of a first sampling point and a second sampling point to be ΔW1 and ΔVi. Thus, ΔWi=Wi−T. The nonlinearity error of the tested circuit f(ωt) / dt can express the signal difference of the sampling points as the pulse width signal, i.e. the variation of the pulse width ΔWi.
Refer to FIG. 3 for the sampling circuit according to the present invention. In FIG. 3, f(ωt) is the digital-to-analog conversion output signal of the DAC 10. The digital-to-analog conve...
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