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Driver Amplifier Design - CMOS

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kjha

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Hi everyone..

I am designing a driver amplifier driving a 100 mW resistive load using CMOS 0.18 um process. can anyone pls give me some tips on the design??

I am thinking of designing a CMOS op-AMP with wide transistors on the output stage - (can I draw 30 mA current from CMOS transistors?? )

this might be stupid but, is it possible to just use a current mirror to drive the load?? why is the amp required??

Thanks!
 

Depends on what you want to drive: If it is a simple DC current (e.g. for driving a LED), a current mirror (1 : x) should do it. If you need an audio driver, you have to use an opAmp (with feedback, linearity reason). 30mA isn't a challenge, needs rather large transistor(s), however.
 

Thanks Erikl,

Its a heater/resistor..so i dont think linearity is a concern..all i care about is that my circuit should be able to drive the load..

i'll try a current mirror and see if that works..Thanks!
 

kjha said:
Its a heater/resistor..so i dont think linearity is a concern..all i care about is that my circuit should be able to drive the load..

i'll try a current mirror and see if that works..
Click to expand...

Yes, for this purpose it should work well. Don't waste too much current for the mirror "master", may be just 1:10 ... 1:100 , and distribute the few master's fingers well between the slave (output) fingers. If you need any precision, make sure that master and slave have the same VDS.
 

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