SIGMA-DELTA MODULATOR AND METHOD FOR DIGITIZING SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a sigma-delta modulator by which an analog signal having a multiplex protocol is received and a method for changing the degree of the signal-delta modulator based on the protocol of the received analog signal. SOLUTION: The sigma-delta modulator 10 is provided with at least one switch 16 for changing the degree of the modulator 10. The degree of the modulator 10 is changed based on the communication protocol of the received analog signal. In detail, the degree of the modulator 10 becomes larger concerning the communication protocol with a wide information band width. Or it becomes smaller concerning the one with the narrow information band width.