heathtech wrote:
Decoupling: To reduce or eliminate the coupling of (one circuit or part to another).
Coupling: Transfer of energy from one circuit to another
dar2525: Thanks for replying. Can you give a short example of the above statement or try to explain more detailed?
Well, you are being schooled on clock pulsing and other topics by other posters as to the specifics of your circuit, but, I THINK the best way to say it is, as far as decoupling goes : If you decouple something, you detach it, right? Like, if you have two pieces of pipe, you can couple them together with a union, and decouple them by removing the union.
...So, in electronics, circuits can be coupled and decoupled as well. I am not the best at explaining, so bare with me. If a capacitor is put from an input pin of a solid state device to ground, it is "decoupling" the IC or transistor from unwanted noise. Caps PASS Ac, and reject DC, so unwanted AC will go to ground. Depending on the VALUE of the Cap, desirable AC wil not go to ground, and allowed to go to the input of the device. This is called "band-passing", good frequency bands are rejected from ground and "passed" to the input and bad ones are pulled to ground. remember, caps only pass AC.
...Coupling capacitors work the opposite way, they are installed between two components and couple them just as the pipes are coupled with a union. They "promote" the passing of good AC signals, and stop DC from going to device inputs. The DC is rejected, and pulled to ground by either a resistor or choke.
I hope I've explained this OK, maybe someone elso could elaborate or edit my explanation ?