Mismatch-Shaped Pseudo-Passive Two-Capacitor DAC
نویسنده
چکیده
A simple mismatch-shaping scheme is proposed for a two-capacitor DAC. Unlike in other mismatchshaping systems, the shaped error is generated by direct ltering of a well-de ned bounded signal, which can be generated as white noise. The operation is closely related to a speci c digital interpolation lter, but arbitrary properties of the overall interpolation characteristic can be assured. Simulations indicate that the scheme can be used for the realization of DACs with 16-bit linearity and SNR performance, with only 0.1% capacitance accuracy. The DAC is pseudo-passive, i.e. an active element is required only to bu er the output signal. Hence, it is potentially a very low-power circuit, suitable for portable applications.
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