VTU eNotes On Analog and Mixed Mode VLSI Design (Electronics and Communication)
About this eBook
Introduction Why data Conversion Most real-world signals are analog in nature. Real-world signals-Continuous time, Continuous amplitude However Digital signal processing allows us to efficiently manipulate information. Digital abstraction-discrete time, discrete amplitude To take advantage of DSP we must be able to move from analog to digital and back as needed What is data Converter A device that converts a signal from analog to digital domain and vice versa. What type of systems require data converters Any system that requires real inputs from outside world that need to be processed digitally or any system that wants to convert digital data to analog signal that can be interpreted in the outside world need a converter.
How does a data converter fit in to signal chain Data converters typically accept analog signals from sensors once these signals have been conditioned, and pass off digital data to a processor. They can also accept digital data from these devices and pass them off for signal conditioning and analog system output.
Applications- wide range. Performance requirements such as resolution and bandwidth are set by intended applications. Portable devices-push the limits of technology by requiring faster speed and lower power. Communications Wireless transceivers, Modems Computing and control Imagers,displays, Multimedia Measurement Instrumentation Test equipment, Industrial and scientific Instrumentation, Sensors actuators. Consumer Electronics Video Audio, Control Automotive, Appliances, etc . Embedded data Conversion
Types of Data Converters Two types 1. Analog to digital Converter ADC 2. Digital to analog Converter DAC Analog to digital converter consists of two basic functions. Sampling convert a continuous time input signal to a discrete time representation. Quantization convert a continuous amplitude input signal to a discrete amplitude representation.