A -89-dBc IMD3 DAC Sub-System in a 465-MHz BW CT Delta-Sigma ADC Using a Power and Area Efficient Calibration Technique.

This brief presents a power and area efficient way to measure the feedback DAC static mismatch error in a multi-bit continuous-time delta-sigma modulator. By sequentially forcing each DAC element output in the designed scheme, the mismatch errors among DAC elements can be measured digitally using the ADC itself. The measured errors are then corrected using a two-parameter calibration DAC that trac...