Patent ID: 7760118

Claim:
An electronic device for analog-to-digital conversion comprising: a sigma-delta modulator (SDMOD); a digital filter (FIL) for digital post processing of the output signal of the sigma-delta modulator (SDMOD), said digital filter including registers storing content representing the internal state relating to a specific input signal; a multiplexer (MUX) for switching the input (INSD) of the sigma-delta modulator (SDMOD) between a first input signal (IN 1 ) and a second input signal (IN 2 ); a memory (MEM) adapted to hold the register content of said digital filter (FIL) relating to said first input signal while said second input signal (IN 2 ) is processed in said digital filter and to hold the register content of said digital filter (FIL) relating to said second input signal while said first input signal (IN 2 ) is processed in said digital filter; and a controller (CNTL) operable to retrieve the register contents relating to said first input signal from said memory (MEM) when said digital filter (FIL) resumes processing of said first input signal (IN 1 ) and to retrieve the register contents relating to the second input signal from said memory (MEM) when said digital filter (FIL) resumes processing of said second input signal (IN 2 ).