D/A converter
AssigneeSony Corporation
InventorYasufumi Hino
Life of this patent
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Abstract
A D/A converter includes: an (N−1)-stage reference resistor group; an N-stage reference resistor group; inter-stage op-amps applying a divided voltage outputted from voltage taps of the (N−1)-stage reference resistor group, across both ends of the N-stage reference resistor group as the Nth reference voltage; a dynamic range expanding means for arranging the voltage taps in the (N−1)-stage reference resistor group so as to expand upward and downward, to expand an input dynamic range in the N-stage reference resistor group; and expansion resistors arranged respectively at both upper and lower ends of the N-stage reference resistor group in response to upward and downward expanded amounts of the dynamic range.
Claims2
A D/A converter comprising:
- an (N−1)-stage reference resistor group including serially connecting a plurality of reference resistors, the (N−1)-stage reference resistor group extracting an (N−1)th reference voltage applied thereacross from two voltage taps selected in response to a result obtained by decoding an input digital waveform signal, and outputting a divided analog voltage;
- an N-stage reference resistor group including serially connecting a plurality of reference resistors, an N-stage reference resistor group extracting an Nth reference voltage applied thereacross from two voltage taps selected in response to a result obtained by decoding the input digital waveform signal, and outputting a divided analog voltage;
- inter-stage op-amps applying the divided voltage outputted from the voltage taps of the (N−1)-stage reference resistor group, across both ends of the N-stage reference resistor group as the Nth reference voltage;
- a dynamic range expanding means for arranging the voltage taps in the (N−1)-stage reference resistor group so as to expand upward and downward, to expand an input dynamic range in the N-stage reference resistor group;
- and
- expansion resistors arranged respectively at both upper and lower ends of the N-stage reference resistor group in response to upward and downward expanded amounts of the dynamic range.
Dependencies are inferred from the claim text.