In predominantly digital systems it is often necessary to include linear circuit functions. Traditionally, separate power supplies have been used to run the linear components (see Box, “Linear Power ...
Linear Circuit Transfer Functions: An Introduction to Fast Analytical Techniques, Christophe P. Basso, Wiley, IEEE Press (www.wiley.com), ISBN: 978 111 923 637 5, glossy hardback, 445 numbered pages, ...