Non-feedback Delta-Sigma D/A converter system

Abstract

A way to avoid many of the difficulties encountered with conventional methods in D/A converters is to use a well-established technique called delta-sigma noise shaping~\cite{steven}. This technique will increase the resolution, however it will lead to increased complexity and thereby increased power consumption. The complexity of the global feedback loops might limit the clock speed of these converters.

A new technique for Delta-Sigma A/D modulation is described. It describes a modulator with no global feedback loops and this method can be used in D/A conversion with some modifications. The emphases for this thesis is to design, simulate, implement and measure the new pipelined first order $\Delta\!-\!\Sigma$ digital to analogue modulator. Since this new modulator is mathematical equivalent with the conventional one there are no differences when simulating them. The difference is the higher oversampling ratios for the new pipelined modulator when the system is implemented. This difference is more evident when the modulator has a higher order.