Output stage for op-amp without loading effect

[urn]

Output stage for op-amp

hi,

I have designed an op-amp to use it as part of another circuit.......but i am having a problem with that.... it is having loading effect......i mean the output voltage is varying depending upon my load value...... this is not acceptable for my use......

So can anyone suggest me an output stage which eliminates my problem...

I am attaching the schematic of my op-amp....

Thanks in Advance,

 

[doibongvui]

Re: Output stage for op-amp

When running simulation did you include any loading? I suspect output current is small.

BTW: your bias circuit (the one on far left) look not good to me

 

[BackerShu]

Output stage for op-amp

There is no compensation in your opamp. Its due to the certain situation???
Could you please elaborate the whole circuit.

 

[crazy4analog]

you could use a source follower

 

[surianova]

Re: Output stage for op-amp

hi,

I have designed an op-amp to use it as part of another circuit.......but i am having a problem with that.... it is having loading effect......i mean the output voltage is varying depending upon my load value...... this is not acceptable for my use......

So can anyone suggest me an output stage which eliminates my problem...

I am attaching the schematic of my op-amp....

Thanks in Advance,

if the load is resistive load, u must use source follower with the gain=1

if the load is capacitive load, u can use common source amplifier.

 

[angelwin]

cascade op and the compensation components will resolve the problem.

 

[ankitgarg0312]

you will have to attach a buffer at output of opamp.
your load may be sinking/sourcing current into opamp which will disturb the bias conditions of output branch.