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US 4,734,678 AGranted
High-resolution A/D converter
AssigneeSeiko Instruments Inc.
InventorsMasafumi Take, Haruo Takeda
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Abstract
In order to provide a high-resolution A/D converter, the present invention is based upon the combination of two D/A converters, an input switch, an adder, an amplifier and a processor, wherein characteristics of the two D/A converters are learned relying upon the work of the processor and the switch, and the final digital output is corrected relying upon the thus learned characteristics to accomplish a high resolution.
Claims1
A high-resolution A/D converter which comprises:
- a first D/A converter;
- a switch for selecting an output signal of said first D/A converter and an analog input signal;
- a second D/A converter;
- an adder which performs the addition or subtraction of a signal that has passed through said switch and an output signal of said second D/A converter;
- an amplifier for amplifying the output signal of said adder;
- an A/D converter for converting the output signal of said amplifier into a digital value;
- and
- a processor which reads the output of said A/D converter and give input values to said first and second D/A converters;
- wherein said processor stores all minimum bit widths of said first and second D/A converters, when said first D/A converter is selected as an input by said switch, and corrects the digital output value when the analog signal is selected as an input by said switch.
6 more elements
Dependencies are inferred from the claim text.