Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

What are DC-couple and AC-couple??

Status
Not open for further replies.

nemolee

Full Member level 3
Joined
Dec 28, 2004
Messages
155
Helped
3
Reputation
6
Reaction score
1
Trophy points
1,298
Activity points
1,467
ac couple dc couple

Dear Sirs,

Anyone can tell me what are DC-couple and AC-couple?
What different are them?
Thanks a lot.
 

ac couple need a cap, which only ac signal can pass.
dc couple need not a cap. there is a dc bias
 

IN the AC couple . always the chip can change the Bias (operation point) , IN the DC couple ,.. SOme part like ferrie beer ..The DC can pass .and reject ac noise
 

I like to add:
In AC couple, some unwanted DC voltage blocked.
and pure original AC signal passed.
On the other hand, DC couple used in cases, where
we need to pass signal with DC voltage.
it means original signal include DC voltage.
For example composite video signal.

Regards
Davood
 

DC couple and AC couple are applied on the necessity of signal transmission. As Davood mentioned, AC couple is to block the DC voltage and just allow AC signal. Let say one block circuit operate with dc 1.2V and the next stage operate with dc 1.5V, so here you have to block the 1.2V and pass AC only, thus you can you use resistive biasing to have 1.5V to next stage operation. As for DC couple, if between stages, the same dc voltage are applied, then there is no cap to block any dc within them.
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top