why we mostly use capacitance at the output of circuit?

[neetinsingh]

why we mostly use capacitance at the output of circuit for measuring it characterstic. wht will be difference if we use resistance or inductance instead of it........l

 

[gabin]

we use capacitor at the end of most circuits because most of our loads are inductive so in order to overcome the inductive effect of the load we use capacitor.
For capcitive loads we use inductor. Resistors are used just to limit the current.
Capacitor also shunt out the flucuations and thus provides safety to the load.

 

[A.Anand Srinivasan]

it is due to the capacitive in the input stage of most circuits.... consider BJTs and MOS in the input stage...

 

[neetinsingh]

we use capacitor at the end of most circuits because most of our loads are inductive so in order to overcome the inductive effect of the load we use capacitor.
For capcitive loads we use inductor. Resistors are used just to limit the current.

wht will be the effect on the performance of circuit if we use some other load beside that capacitance........which parameters will get affected ????

 

[gabin]

we use capacitor at the end of most circuits because most of our loads are inductive so in order to overcome the inductive effect of the load we use capacitor.
For capcitive loads we use inductor. Resistors are used just to limit the current.

 

[subharpe]

Capacitors at the output are used for various purposes. For decoupling with ground, for switch on/off spike removal, for impedence matching(capacitive input), for ac coupling with the next stage etc.

 

[murali_dece]

capacitor shows very high impedance to d.c to pass through it ,where as for a.c current it shows very low impedence. capacitor plays vital role while coupling output and load. since most loads are inductive they will burn when D.C power enters.capacitors in the output stage allows only analog signal to pass through it and stop the D.C power to enter into the load.capacitor is used for D.C isolation between two stages in a circuit

 

[Audioguru]

why we mostly use capacitance at the output of circuit for measuring it characterstic. wht will be difference if we use resistance or inductance instead of it........l

It would be more helpful for you to attach a schematic that shows which capacitor you are talking about.
Do you mean the 100pF capacitor to ground that is added at the output of most opamps to ground when they test for Rise Time, Overshoot and Slew Rate?

The capacitor represents stray capacitance in the wiring of the circuit and capacitance of a short piece of shielded cable that the opamp might drive.

 

[gabin]

In the absence of capacitor the load what ever it is may damaged.
In amplificatoin circuits it is be used as a coupling capacior and bypass capacitor.
The capacitor is also used to discharge accross the load such as in oscillators.

 

[avi_e-]

Hi Friend,


It reduces the harmonics,blocks the unwanted signals & makes the output

ripple free.


Regards,
Avinash.S.

 

[patolfo]

To decouple signals, this is to block off, the dc component from one stage to other stage, it just dependes where you put connect the capacitor shunts or series?

 

[shabab]

may be due to the capacitive in the input