August 2012
Intermediate to advanced
608 pages
17h 15m
English
Content preview from The Design of Active CrossoversBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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CHAPTER 13
Opamps for Active Crossovers
13.1 Active Devices for Active Crossovers
It is a truth universally acknowledged, that if you are designing an active crossover, you will need active devices. In this day and age that almost always means opamps. Active crossovers can be built with discrete transistor circuitry if this is desirable for performance benefits or marketing reasons. This is relatively straightforward for Sallen & Key filters that require only a unity-gain buffer or voltage-follower, which can be implemented as some form of emitter-follower. It is a bit more complex for MFB filters and some equaliser circuits, which require a high-open-loop-gain inverting amplifier, and more complex again for configurations such as state-variable ...
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