Design of RF/IF Analog to Digital Converters for Software Radio Communication Receivers. (May 2006) Bharath Kumar Thandri, B.E. (Hons.), Birla Institute of Technology and Science (BITS), Pilani, India; M.S., Texas A&M University Chair of Advisory Committee: Dr. Jose Silva-Martinez Software radio architecture can support multiple standards by performing analogto-digital (A/D) conversion of the r...

This paper presents a fast multiple sampling method for low-noise CMOS image sensor (CIS) applications with column-parallel successive approximation register analog-to-digital converters (SAR ADCs). The 12-bit SAR ADC using the proposed multiple sampling method decreases the A/D conversion time by repeatedly converting a pixel output to 4-bit after the first 12-bit A/D conversion, reducing nois...

This paper describes a VHDL implementation of a behavioural model for novel programmable resolution analog to digital converters (ADCs). This architecture uses the dichotomic method in the conversion. The goal for using this VHDL description is to validate the algorithm conversion and facilitate the synthesis of the digital part. In this example it includes digital control of dichotomic method....

This paper introduces novel techniques to perform analog to digital (AID) conversion, based on the quantization of the coefficients obtained by the projection of a continuoustime signal over an orthogonal space. The new AID techniques proposed here are motivated by the sampling of the input signal in domains which may lead to lower levels of signal distortion and significantly less demanding A/...

A new background calibration technique for pipelined analog-to-digital converters is proposed. By dividing the step sizes of the multiplying digital-to-analog converter (MDAC) in a pipeline stages and injecting a random signal into the MDAC, it is possible to calibrate a pipeline stage without interrupting the normal analog-to-digital operation. The calibration can eliminate the nonlinear effec...

Personal Communications Services (PCS) require low-power radio technologies. One such transceiver architecture employing frequency-hopped spread-spectrum techniques is presented. System features such as antenna diversity with equal-gain combining and sequential hop combining are incorporated into the transceiver design to achieve robust wireless digital data transmission over fading channels. A...

This document describes digital audio sampling-rate conversion and related concepts. Opensource software is provided, and pointers are given to related projects and papers.

This project explores the design of a type of direct-conversion ADC called a Residue Amplifier Pipeline ADC. Direct-conversion ADCs are a class of ADCs that operate at very high speeds, because the input signal is converted to a digital value in a single iteration. Other types of ADCs require many comparison iterations to convert the signal, resulting in much slower conversion times. This desig...

Resistive sensors configured as Wheatstone bridges are primarily used to sense pressure, temperature or loads. An external A/D converter (ADC) and a digitally Programmable Gain Amplifier (PGA) can easily be used to convert the difference voltage from these resistor bridge sensors to usable digital words for manipulation by the microcontroller. When the PGA is used in this system, the other chan...

There exist measuring devices where an analog input is converted into a digital output. Such converters can have a nonlinear internal dynamics. We show how measurements with such converting devices can be understood using concepts from symbolic dynamics. Our approach is based on a nonlinear one-to-one mapping between the analog input and the digital output of the device. We analyze the Bernoull...