Radix-based Digital Calibration Technique for Multi-stage Adc
نویسندگان
چکیده
This paper describes a digital-domain self-calibration technique for multi-stage analog-to-digital converter (ADC). An accurate calibration is achieved by using a modified radixbased calculation. The equivalent radix-based error term for each stage is extracted by measuring major carry jumps from the ADC transfer curve. A new multiplying digitalto-analog converter (MDAC) architecture using (instead of ) is used to reduce the number of error terms in each stage. The radix-based digital calibration technique calibrates capacitor mismatch as well as finite opamp dc gain, while the digital redundancy compensates for opamp and comparator offsets and signal-independent charge injection.
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