June 2006
Beginner
488 pages
13h 2m
English
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13
Electronic analogue switching, Part II: discrete FETs
Discrete FET switching
Having looked in detail at analogue switching using CMOS gates, and having seen how well they can be made to work, you might be puzzled as to why anyone should wish to perform the same function with discrete FETs. There are at least two advantages in particular applications. Firstly, JFETs can handle the full output range of opamps working from maximum supply rails, so higher signal levels can often be switched directly without requiring opamps to convert between current and voltage mode. Secondly, the direct access to the device gate allows relatively slow changes in attenuation (though still measured in milliseconds, for reasons that will emerge) rather than the rapid ...
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