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what's meant by coupling - RF Cafe Forums
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guest
Post subject: what's meant by coupling Posted: Mon Sep 12,
2005 4:58 am
i m an undergraduate and starting out in circuit analysis
and design and hope to go on to do something in rf field 'cause i like
it a lot. i've a very basic question to ask...when people talk about
ac coupling capacitor, what they do really mean? exactly, what does
coupling exactly mean? i know blocking cap blocks dc signal, bypass
cap open circuits the dc signal but i'm not exactly sure what's meant
by dc coupling or ac coupling.
any explanation w/ or w/o example
will help a lot! thanx
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IR
Post subject: Posted:
Mon Sep 12, 2005 6:03 am
Site Admin
Joined: Mon Jun
27, 2005 2:02 pm
Posts: 373
Location: Germany
Coupling means
how much the signal will pass forward from one point to another. AC
coupling is done by means of series capacitor. As the frequency increases
the reactance of the capacitor drops, according to the ratio of Xc=1/2*pi*f*C.
_________________
Best regards,
- IR
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guest
Post subject: Posted: Mon Sep 12, 2005 6:37 pm
hi IR, this means that a series capacitor that is used for ac coupling
is then also a dc block??
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IR
Post subject:
Posted: Mon Sep 12, 2005 11:30 pm
Site Admin
Joined:
Mon Jun 27, 2005 2:02 pm
Posts: 373
Location: Germany
Exactly!!
_________________
Best regards,
- IR
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YZ-israel
Post subject: Posted: Wed Sep 14, 2005 1:33 am
you can say DC coupling is the same as High Pass Filter.
It will
blocked the DC and the lower Freq. and pass the higher freq.
the 3 dB point for this filter depend on the capacitor and the impedance.[/img]
Posted 11/12/2012
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