Patent ID: 7675448

Claim:
A continuous-time sigma-delta modulator using dynamic element matching (DEM), comprising: a frequency response module; a quantizer having an input terminal coupled to an output terminal of the frequency response module; a digital multiplexer having a first input terminal coupled to an output terminal of the quantizer; a DEM module having an input terminal coupled to the output terminal of the quantizer, and having an output terminal coupled to a second input terminal of the digital multiplexer; a digital-to-analog (DAC) converter having an input terminal coupled to an output terminal of the digital multiplexer; and an adder having a first input terminal for receiving a continuous-time signal, having a second input terminal coupled to an output terminal of the DAC converter, and having an output terminal coupled to an input terminal of the frequency response module; wherein output signals of the quantizer during a current cycle are sent to the DEM module to determine a selection result of the digital multiplexer at a next cycle.