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  • kran
    kran

    Member • Dec 1, 2008

    What is a coupling capacitor?

    Hello all , I want to know what is meant by a coupling capacitor? I googled up to find that In analog circuits, a coupling capacitor is used to connect two circuits such that only the AC signal from the first circuit can pass through to the next while DC is blocked. Can someone here explain this in detail? Please help.
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  • silverscorpion

    Member • Dec 2, 2008

    A coupling capacitor is a capacitor used to separate the various stages in a circuit, for example, to separate the stages of a multistaged amplifier. It separates the dc and ac components and 'couples' the output of one stage to the input of the next stage.
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  • sauravgoswami

    Member • Dec 2, 2008

    watever silver said is correct,but the basic function of coupling capacitors is too remove noise or other disturbances and make sure the output of previous stage is compatible with one were it is inputted!!!
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  • r6rammy

    Member • Dec 7, 2008

    do i use it for adding dc to an ac signal???
    I am planning to do differential conductance measurement and i need to add the sine out from the lock in amplifier to a dc sourcemeter, how do i go about adding both together? Just join them????
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  • me_crazy

    Member • Jan 1, 2009

    Take a look here:
    <a href="https://en.wikipedia.org/wiki/Capacitive_coupling" target="_blank" rel="nofollow noopener noreferrer">Capacitive Coupling</a>
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    I hope they'll help you.
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  • augustin87r

    Member • Dec 7, 2010

    Hello,

    I have going through theoretic details about coupling capacitance. I have to exercise somehow. On this schematic, what are the coupling capacitors? I know a few , especially the electrolitic ones, but can somebody tell me all of them so that i can check my guesses...BEst regards, Augustin

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  • akshay04907

    Member • Dec 7, 2010

    but sharat why it is necessary to block the dc component?why they r source of noise only?
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  • cranky

    Member • Dec 10, 2010

    sauravgoswami
    watever silver said is correct,but the basic function of coupling capacitors is too remove noise or other disturbances and make sure the output of previous stage is compatible with one were it is inputted!!!
    hey i guess the noise here refers to the dc component silver mentioned
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  • cranky

    Member • Dec 10, 2010

    akshay04907
    but sharat why it is necessary to block the dc component?why they r source of noise only?
    It becomes necessary to block dc components cause-for one,you want your signal with zero as reference,as in no offset...secondly,you do analysis about the operating point and hence,you don't want to disturb the bias

    * if Someone could say if this is right
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  • shreyasm89

    Member • Dec 20, 2010

    you are absolutely right
    cranky
    It becomes necessary to block dc components cause-for one,you want your signal with zero as reference,as in no offset...secondly,you do analysis about the operating point and hence,you don't want to disturb the bias

    * if Someone could say if this is right
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  • cranky

    Member • Dec 28, 2010

    @shreyas89:thumbs up 😀
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  • Bags003

    Member • Dec 30, 2010

    It helps to isolate the DC bias settings of the two coupled circuits.
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  • electronics12

    Member • Apr 6, 2012

    A coupling capacitor is a capacitor that allows AC signals to go through but not DC. DC signals are blocked. This is useful for many applications such as when biasing microphones. The DC is needed just for power but should not be transferred to the second half of the circuit.

    A good article for reference on coupling capacitors is:
    <a href="https://www.learningaboutelectronics.com/Articles/What-is-a-coupling-capacitor" target="_blank" rel="nofollow noopener noreferrer">What is a Coupling Capacitor?</a>
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  • larry80

    Member • Sep 11, 2012

    A single capacitor that is used to link one amplifier stage to another is often called a coupling capacitor.

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  • naveee

    Member • Sep 12, 2012

    silverscorpion
    A coupling capacitor is a capacitor used to separate the various stages in a circuit, for example, to separate the stages of a multistaged amplifier. It separates the dc and ac components and 'couples' the output of one stage to the input of the next stage.
    if both AC an DC are separated wat component will through the remaining circuit ?????
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  • Jeffrey Arulraj

    Member • Sep 12, 2012

    r6rammy
    do i use it for adding dc to an ac signal???
    I am planning to do differential conductance measurement and i need to add the sine out from the lock in amplifier to a dc sourcemeter, how do i go about adding both together? Just join them????
    not possible to add a DC signal to AC signal using a coupling capacitor it prevents the DC component completely and passes the AC component furthur
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  • Jeffrey Arulraj

    Member • Sep 12, 2012

    naveee
    if both AC an DC are separated wat component will through the remaining circuit ?????
    my post #17 answers your qn also i guess
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  • Jeffrey Arulraj

    Member • Sep 12, 2012

    cranky
    It becomes necessary to block dc components cause-for one,you want your signal with zero as reference,as in no offset...secondly,you do analysis about the operating point and hence,you don't want to disturb the bias

    * if Someone could say if this is right

    dc component is not the only source of noise any where

    in multi stage if DC passes further there is a possibility of shifting the bias and also to cause signal loss

    this can be avoided if we use a coupling capacitor
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  • Naman Agarwal

    Member • Sep 13, 2012

    a simple capacitor can do blocking of dc...then whats is the need of coupling capacitor??
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  • Jeffrey Arulraj

    Member • Sep 14, 2012

    coupling capacitor is used for coupling AC signal from one point to another

    what is that you can't understand in it ?
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