Interfacing
Tim Williams
13.1 Mixing Analog and Digital
The two main problems which face designers who have to integrate analog and digital circuits on the same printed circuit board (PCB) are:
• preventing digital switching noise from contaminating the analog signal, and
• interfacing the wide range of analog input voltages to the digital circuit.
Generating analog outputs from digital signals is not usually a problem. Generating digital inputs from analog signals is.
13.1.1 Ground Noise
The high-frequency switching noise discussed earlier must be kept out of analog circuits at all costs. An analog-to-digital interface quantizes a variable analog signal into a digital word, and the number of bits in the word determines the resolution that ...
Get Electrical Engineering: Know It All now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
