Oversampled data converters are becoming increasingly popular
for high-precision data conversion. There have been many
publications on oversampled analog-to-digital (A/D) converters but
relatively few on oversampled digital-to-analog (D/A) converters.
In this thesis, issues concerning the analysis and design of the
oversampled D/A converters are addressed. Simulation tools and
analytical methods...
Oversampling and noise-shaping methods for digital-to-analog (D/A) conversion have
been widely accepted as methods of choice in high performance data conversion
applications. In this thesis, the fundamentals of D/A conversion and oversampling D/A
conversion were discussed, along with the detailed analysis and comparison of the reported
state-of-the-art oversampling D/A converters....
The design of mixed-signal integrated circuits has evolved from simple analog and digital circuits operating on the same silicon substrate to the point that now we have complete system on a chip solutions for communication systems. The levels of integration needed to remain cost effective in today's integrated circuit (IC)...
Digital-to-analog converters (DACs) suffer from static and dynamic nonlinearity problems, which degrade their accuracy and performance. Mismatch errors in the analog components restrict the maximum achievable linearity.
This thesis presents various techniques for correcting these errors. It describes a correction process for the nonlinear behavior of DACs, on three different...
Decision Feedback Equalization (DFE) in a data recovery channel filters
the bit decision in the current symbol period in generating the sample at the
comparator in the subsequent clock period. The operations of sampling,
comparing, filtering the decision bits into a feedback signal, and subtraction of
that feedback signal are...
Delta-sigma data converters have gained popularity in both analog-to-digital and digital-to-analog converters (ADCs and DACs) due to their simplicity, high linearity and immunity to many analog circuit imperfections. These data converters include features such as oversampling, noise-shaping, and (historically) single-bit quantization. Single-bit converters are preferred for their inherent linearity. This...
Delta-sigma modulators are currently a very popular technique for making high-resolution
analog-to-digital converters (ADCs) and digital-to-analog converters (DACs).
These oversampled data converters have several advantages over conventional Nyquist-rate
converters, including an insensitivity to many analog component imperfections, a
simpler antialiasing filter and reduced accuracy requirements in the sample and hold....
In this thesis work, a design of 14-bit, 20MS/s segmented digital-to-analog converter (DAC) is presented. The segmented DAC uses switched-capacitor configuration to implement 8 (LSB) + 6 (MSB) segmented architecture to achieve high performance for minimum area. The implemented LSB DAC is based on quasi-passive pipelined DAC that has been...
Digital-to-analog converters (DACs) with wide dynamic range and high
linearity are required for high-end audio applications. A multi-bit delta sigma
audio DAC, using a novel gain-correction technique, is described in this thesis. For
widely varying on-chip RC time constant, the DAC gain can be accurately
controlled by the correction circuitry....