Dynamic element matching for multi-bit digital-to-analog converter in continuous-time delta sigma modulators

A continuous-time delta-sigma modulator (CTDSM) system, comprising:

• a quantizer configured to quantize an analog input signal into one or more thermometer-coded digital signals;
• an update block configured to generate control signals based on the thermometer-coded digital signals;
• a switching block configured to route the thermometer-coded digital signals to a plurality of digital-to-analog converter (DAC) elements based on the control signals, wherein the plurality of DAC elements configured to convert the thermometer-coded digital signals into analog outputs;
• a summation block configured to combine the analog outputs from the plurality of DAC elements to produce a final analog output;
• and
• a feedback path configured to use the final analog output as a feedback signal for the CTDSM system.

A continuous-time delta-sigma modulator (CTDSM) system, comprising:

• a quantizer configured to quantize an analog input signal into thermometer-coded digital signals;
• an update block configured to:
• detect at least one mismatch condition in the thermometer-coded digital signals;
• and
• toggle a pseudo-random sequence bit in response to detecting the at least one mismatch condition;
• a switching block configured to shuffle the thermometer-coded digital signals based on the pseudo-random sequence bit to average mismatch-induced errors over time;
• a plurality of digital-to-analog converter (DAC) elements, each configured to:
• receive the shuffled thermometer-coded digital signals;
• and
• convert the thermometer-coded digital signals into analog outputs;
• and
• a summation block configured to combine the analog outputs of the DAC elements to produce a final analog output.