System and method of improving stability of continuous-time delta-sigma modulators

摘要

An analog-to-digital converter (ADC) can include a continuous-time delta sigma modulator and calibration logic. The calibration logic can calibrate direct feedback and flash clock delay coefficients of the continuous-time delta-sigma modulator without interrupting the normal operations of the ADC (e.g., in situ). Thus, the calibration logic can rectify performance and stability degradation by calibrating suboptimal coefficients.

主权项

1. A calibration system, comprising:
a continuous-time delta sigma analog-to-digital converter (ADC) that receives an analog input and converts the analog input to digital data; a data monitor that parses the digital data to produce an output; and calibration logic configured to adjust stability parameters of the ADC, at least based on the output of the data monitor, wherein the stability parameters include at least one of a direct feedback coefficient of the ADC and a flash digital-to-analog converter (DAC) timing coefficient of the ADC.