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Analog Circuit Design by Jim Williams, Bob Dobkin

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27

Designing linear circuits for 5V single supply operation

Jim Williams

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 Supplies—Past, Present, and Future”).

Recently, there has been increasing interest in powering linear circuits directly from the 5V logic rail. The logic rail is a difficult place for analog components to function. The high amplitude broadband current and voltage noise generated by logic clocking makes analog circuit operation difficult. (See Box, “Using Logic Supplies for Linear Functions”.)

Generally speaking, analog circuitry which must achieve very high performance levels should ...

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