Digital / analog converter
AssigneeOki Electric Industry Co., Ltd.
InventorMasaru Sekiguchi
Life of this patent
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Abstract
A D/A converter is provided which is capable of avoiding an increase in occupied areas of the D/A converter on a board and of obtaining an output characteristic being excellent in linearity, which enables achievement of the D/A converter having a small integral-linearity error (INL) and a small differential-linearity error (DNL). The reference current composite blocks are cascaded between current controlling device groups and an output switch. At least one out of reference current composite blocks divides composite reference current amounts based on a predetermined weight and outputs them.
Claims6
A digital/analog converter comprising:
- first current controlling device groups, each group being partitioned by a predetermined number of current controlling devices and each outputting a current to define an amount of currents corresponding to a bit value of an input digital signal;
- second current controlling device groups, each group being partitioned by a predetermined number of current controlling devices being cascaded a specified current controlling device in said first current controlling device groups and each producing a composite sum of currents output from said specified current controlling device corresponding to cascaded connection;
- an output switch outputting a composite current summed by said second current controlling device group based on switch control corresponding to a bit value of an input digital signal;
- and
- wherein a current to be fed to said output switch is divided at a specified ratio by at least one of said second current controlling groups.
Dependencies are inferred from the claim text.