Analog-to-digital converters form the backbone of many real world systems. A compression and expansion (companding) capability is a useful tool to increase the signal-to-noise ratio of many of these applications. Frequently, power-signal systems…
Contents
1 Introduction
2 Background
2.1 Analog-to-Digital Converter Characteristics
2.1.1 Quantization Error
2.1.2 Dynamic Range
2.1.3 Signal-to-Noise Ratio (SNR )
2.1.4 Power Consumption
2.1.5 Propagation Delay
2.2 Appropriate Signals
2.3 Sample ADCs
2.3.1 Non-linear Architectures
2.3.2 Flash Analog-to-Digital Converter
3 A New Compressing Architecture Based on the “Flash” Principle
3.1 Description
3.2 Ideal Converter Characteristics
3.2.1 Transfer Function
3.2.2 Quantization Error (Qe)
3.2.3 Resolution
3.2.4 Signal-to-Noise Ratio (SNR)
3.2.5 Dynamic Range
3.2.6 Optimal Signal
3.2.7 Comparing Compressing and Linear Converters
3.2.8 Varying Parameters
3.2.9 Generating Arbitrary Transfer Functions
3.3 Device Characteristics
3.3.1 Static and Dynamic Power Consumption
3.3.2 Transient Delay
4 Implementation
4.1 Analog Circuit Design
4.1.1 Reference Ladder
4.1.2 Input Buffer
4.1.3 Sample/Hold
4.1.4 Comparators
4.2 Digital Circuit Design
4.2.1 Encoders
4.2.2 Error correction
4.2.3 Output Buffer and Flip-Flops
4.3 Final Mixed-Signal Circuit
5 Testing
5.1 Test setup
5.2 Measured Results
5.2.1 DC Transfer Function
5.2.2 Power Consumption
5.2.3 Propagation Delay
6 Architectural Analysis and Improvements
6.1 Division of Input Signal
6.2 Signal-Dependent Transient Characteristics
6.3 Other Optimizations
6.4 Applications
7 Conclusion 13
A Derivation of Vnoise
Author: Lauritzen, Keir Christian
Source: University of Maryland
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