Digital-to-analog converter and code mapping method applied to the digital-to-analog converter
AssigneeMediatek Inc.
InventorsChih-Hong Lou, Kuan-Hung Chen
Life of this patent
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Abstract
A digital-to-analog converter includes an operational amplifying circuit, a switched capacitor circuit, an R-string sub-circuit, and a direct-charge transfer circuit. The operational amplifying circuit has a pair of differential input ends and a pair of differential output ends. The switched capacitor circuit is coupled to the pair of differential input ends of the operational amplifying circuit. The R-string sub-circuit is coupled to the switched capacitor circuit and the pair of differential input ends of the operational amplifying circuit. The direct-charge transfer circuit is coupled to the pair of differential input ends and the pair of differential output ends of the operational amplifying circuit.
Claims10
A digital-to-analog converter, comprising:
- an operational amplifying circuit, having a pair of differential input ends and a pair of differential output ends;
- a switched capacitor circuit, coupled to the pair of differential input ends of the operational amplifying circuit;
- an R-string sub-circuit, coupled to the switched capacitor circuit and the pair of differential input ends of the operational amplifying circuit;
- and
- a direct-charge transfer circuit, coupled to the pair of differential input ends and the pair of differential output ends of the operational amplifying circuit.
A digital-to-analog converter for converting a digital input code into an analog output, the digital input code having a first code segment, a second code segment, and a third code segment, the digital-to-analog converter comprising:
- an operational amplifying circuit, having a pair of differential input ends and a pair of differential output ends;
- a switched capacitor circuit, coupled to the pair of differential input ends of the operational amplifying circuit;
- an R-string sub-circuit, coupled to the switched capacitor circuit and the pair of differential input ends of the operational amplifying circuit;
- a direct-charge transfer circuit, coupled to the pair of differential input ends and the pair of differential output ends of the operational amplifying circuit;
- and
- a code converting circuit, for converting the first code segment with N bits into an updated first code segment with P bits according to a designated mapping manner;
- wherein N is smaller than P, the first code segment is utilized to control the direct-charge transfer circuit, the second code segment is utilized to control the switched capacitor circuit, and the third code segment is utilized to control the R-string sub-circuit.
Dependencies are inferred from the claim text.