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2n-R D/A CONVERTER
An n-bit 2n-R D/A converter needs 2n resistors of equal value R and (2n+1-2) analog switches. A 3-bit 2n -R D/A converter is shown in Figure, which includes the eight resistors connected in series to form a voltage divider providing eight analog voltage levels, as well as 14 analog switches controlled by the digital input code such that each code creates a single path from the voltage divider to the converter output. A unit-gain amplifier is connected to the output in order to prevent loading of the voltage divider. 2n-R D/A converters are economically manufactured as LSI packages in spite of the large number of components needed.
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