Multi-bit oversampled DAC with dynamic element matching

A Sigma-Delta converter, comprising:

• a) means for receiving an input digital signal;
• b) at least one digital loop filter and quantizer having an input and an output;
• c) at least one subtractor having a first input connected to said means for receiving, a second input connected to said output of said at least one digital loop filter and quantizer, and an output connected to said input of said at least one digital loop filter and quantizer for subtracting from said input digital signal an output digital signal from said at least one digital loop filter and quantizer, and in response generating a difference signal for application to said input of said at least one digital loop filter and quantizer;
• and
• d) a digital-to-analog converter having a plurality of unit elements with minor mismatching therebetween, for receiving and converting to analog said output digital signal from said at least one digital loop filter and quantizer, and in response generating an output analog signal, wherein said digital-to-analog converter comprises means for cyclically selecting successive different permutations of said unit elements for converting each value of said output digital signal thereby canceling said mismatching between unit elements.