Low noise transmission of output data from a delta-sigma modulator

摘要

The output gates of a delta-sigma modulator (52) can generate i(t) transient signals in the power supply lines of the delta-sigma modulator. Those i(t) spikes, which would otherwise produce non-linearities which can be coupled into the frequency band of interest of the modulator, are made to be linear by using return-to-zero data encoding and by providing multi-bit outputs of the delta-sigma modulator in which the output states all have equal numbers of logic ones. IMAGE