GAIN CALIBRATION OF ADC RESIDUE AMPLIFIERS

摘要

A device for gain calibration of an analog-to-digital converter (ADC) residue amplifier includes a digital-to analog converter (DAC) configured to convert a digital signal to an analog signal. The DAC includes a calibration capacitor that can be used in the gain calibration of the ADC residue amplifier. A flash ADC, including a plurality of comparators and an additional comparator, generates the digital signal. The additional comparator provides a threshold voltage approximately in a middle point of a nominal subrange. The nominal subrange comprises a portion of a voltage range corresponding to threshold voltages of two adjacent comparators of the plurality of comparators.

主权项

1. A device for gain calibration of an analog-to-digital converter (ADC) residue amplifier, the device comprising:
a digital-to analog converter (DAC) configured to convert a digital signal to an analog signal, the DAC including a calibration means configured for being used in the gain calibration of the ADC residue amplifier; and a flash ADC configured to generate the digital signal, the flash ADC including a plurality of comparators and an additional comparator, wherein a count of the plurality of comparators is equal to a number of output bits of the flash ADC and the additional comparator is configured to provide a threshold voltage approximately in a middle point of a nominal subrange, wherein the nominal subrange comprises a portion of a voltage range corresponding to threshold voltages of two adjacent comparators of the plurality of comparators.