June 2006
Intermediate to advanced
336 pages
10h 24m
English
Content preview from Demystifying Switched Capacitor Circuits
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Demystifying Switched-Capacitor Circuits
258
7. 3 Accuracy-Enhancement Techniques for SC Circuits
The Imperfect Op-Amp
In active analog circuits, the op-amp is perhaps the most important building block.
For example, in an SC integrator, the primary use of an op-amp is to create a perfect
virtual ground (i.e., a node with a very high impedance and a constant potential) at
its negative input terminal, ensuring a lossless charge transfer at all times. In other
words, ideally no electric charge is absorbed by the op-amp through the virtual
ground. This feature is very important to the active SC circuit that processes signals
in the charge domain. H ...
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