A monotonic digital-to-analog converter (DAC) for converting a digital input
signal
into an analog output signal comprises:
an input node for receiving the digital input signal having at least M+L bits,
an output node for delivering the analog output signal corresponding to
the received digital input signal,
a coarse conversion block comprising current sources and first switching
means for converting M more significant bits of the digital input signal into a
coarse block output current,
a fine conversion block comprising a current divider and second switching
means for converting L less significant bits of the digital input signal into a
corresponding current value, the fine conversion block having means for receiving
current from a first unselected current source of the coarse conversion block, and
a first cascode means for active cascoding the coarse block output current,
a second cascode means, for active cascoding the current from the first
unselected current source.
A method for converting a digital input signal into an analog output signal is
also provided.
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