Communication device with configurable sigma-delta modulator

摘要

In up-to date communication devices an intermediate frequency signal is generated at first in a digital way and than is converted to an analogue signal by a digital-to-analogue converter ( 10 ). In order to offer a greater flexibility in choosing a particular digital-to-analogue converter ( 10 ) the invention proposes to use sigma-delta modulators ( 8 ), the output bit width (n) of which is arranged to be configurable. The advantage of providing sigma-delta modulators with a configurable output bit width is that by this the output bit width of the interpolation filters can be easily adapted to the input bit width of a chosen digital-to-analogue converter without the need to change the internal design of a baseband processing circuit.