[SI-LIST] Re: Bypass vs Decoupling capacitors
- From: Ray Anderson <reanderson@xxxxxxxxxxxxx>
- To: si-list@xxxxxxxxxxxxx
- Date: Wed, 25 Aug 2004 09:09:00 -0700
A couple of points:
* Bypass caps as described by Craig are indeed used as described to
eliminate AC degeneration in amplifiers. This is a different
application than the PDS bypassing.
* There is a difference between a coupling capacitor and a decoupling
capacitor. A coupling capacitor is typically a series element used to
block DC and pass an AC signal. A decoupling capacitor is typically a
shunt element used to provide a low-Z to ground. The actual parts used
in each application can be exactly the same.
-Ray
/Craig Clewell wrote:/
>If you really want to get technical about it....
>Bypass caps are used to eliminate (short out) resistors during ac
>operation. An example would be to bypass an emitter resistor in order
>to increase the voltage gain of an amplifier.
>Coupling caps are used to block the direct current, but still allow ac
>signal to pass. An example would be to couple multiple stages of an
>amplifier.
>However, they are basically performing the same operation
>Regards,
>Craig
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