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Class Exercise 11 (web version only)

11. Components and Sub-systems for Analog-Digital Signal Processing

11.1. Digital-to-Analog Converters (DAC). Deriving the operation from many everyday situations (analogies). Presenting as reference summing (materializing abstract digital code). Generalizing in a block diagram.
11.1.1. Building a DAC: from reference voltage sources and inverting voltage summer with binary-weghted inputs; from a reference current sources, current summer and an active current-to-voltage converter (R-2R ladder DAC). Exploring the circuit at constant reference voltage VREF and varying digital code. Transfer characteristics at different values of VREF. Discussion: What is the function of the reference voltage? What is depend on VREF?
11.1.2. DAC as a digital-controlled resistor and voltage divider (amplifier). Exploring the circuit at varying input voltage VIN and constant digital code. Transfer characteristics at different values of the code. Discussion: What is the function of the code? What is depend on it?
11.1.3. DAC as a digital-analog multiplier (2- and 4- quadrant). Exploring the circuit at varying input voltage VIN and digital code. Transfer characteristics.

11.2. Analog-to-Digital Converters (ADC). Presenting the operation by the negative feedback principle. Generalizing in a block diagram.
11.2.1. Building a ADC from a DAC and a comparator. Exploring the circuit at constant reference voltage VREF and varying input voltage VIN. Transfer characteristics at different values of VREF. Discussion: What is the function of the reference voltage? What is depend on VREF?
11.2.2. ADC as an analog-digital measurer of two voltages (divider). Exploring the circuit at varying input voltage VIN and constant digital code. Transfer characteristics at different values of the code. Discussion: What is the function of the reference voltage? What is depend on it?

11.3. Other building components of the analog-digital sub-systems.
11.3.1. Sample-and-hold circuits.
Capacitor as an analog memory. Discussion: What is the basic contradiction in the circuit?
11.3.2. Analog multiplexors.

11.4. Analog data acquisition sub-systems.
11.4.1. System structure. Block diagrams.
11.4.2.
Special features. Double buffering of multiple byte codes in DAC and ADC.

Last updated June 28, 2004

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