Why opamp has higher voltage gain than a transistor?

[venkat3271]

Hey,
As v all know, Opamp has higher Voltage Gain than that of a transistor.. What makes the op amp to get this feature, though OpAmp is made upof many transistors???

 

[ieropsaltic]

op amp vs transistor

The transistor doesn't have a voltage gain,it has a transconductance i.e it varies its current according to the applied voltage .OpAmps are voltage amplifiers that may be of cascaded single stage amplifiers .When you cascade amplifiers, the total gain will be the multiplication of the gains of all stages,thus leading to a much higher gain than a single stage amplifier .Also, some topologies can used to increase gain like cascode, gain boosting...etc .You may want to refer to "Analog CMOS Integrated Circuits Design "By Razavi chapter 9 to see some topologies of the OTA .

 

[ravitest]

opamp vs transistor

transistor is single stage amplifier where as opamp is two stage amplifier.

 

[vaibhav.k]

transistor vs op amp

As per stability
Op amp is more stable thermally than transistor.Also its other parameter varies accordinglly

 

[ali_th]

transistor vs opamp

ofcource no. its not needed lot of opamp,just opamp is optimize.

 

[amriths04]

op-amp vs transistor

opamps are mainly used for their differential inputs and their applications there-upon based upon it's high input impedance and low output impedance.

 

[tomdchao]

transistor used in op amp circuits

transistor is single stage amplifier where as opamp is two stage amplifier.

it can be 3 or more depend on the spec

 

[husseinadel]

op amp and transistor

as you said ; opamp consists of many transistors , optimized so that the overall gain very high ,