"What is the difference between coupling capacitors and biasing capacitors?"?

Question

"What is the difference between coupling capacitors and biasing capacitors?"?

Answer 1

I'm not familiar with the "bias cap" do you mean bypass capacitor?

i'm not sure if there is a bias capacitor or if i maybe know it as something else...

anyway....

A coupling capcitor is used to block dc whilst allowing and ac part through... depending on the value chosen depends on what frequencies you allow.

a bypass capacitor also known as a de-coupling cap, is used to remove noise or other unwanted signals or frequancies from a dc or low frequancy signal..

these are very basic desciptions that i feel comfortable giving you as i tend to get more confusing when i get too technical...

wikipedia has a good source of info for electronics related things so you an try there if you need to know anything more in depth

Answer 2

A coupling capacitor allows the AC signal to pass through;

while blocking any DC component, or bias.

Answer 3

Maybe bypass instead of "bias".

There is no fundamental difference between the two (for small signals).

When you start to consider higher power nets it is important to consider the dynamic characteristics of the capacitor involved.

For instance, a capacitor coupling a large power signal is going to have to shift a lot of charge on a regular basis and will have to be appropriately rated.  A bypass capacitor might need to cope with a large DC voltage with only a small AC component, so although it will need to retain a large charge, it doesn't need to be able to shift it about so quickly.

I'm not entirely clear about the question, but that's my take on it anyway.