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Design >> Analog Design >> High Linear differential amplifier
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Message started by raja.cedt on May 21^st, 2013, 3:13pm

Title: High Linear differential amplifier
Post by raja.cedt on May 21^st, 2013, 3:13pm

Dear all,
Can any one tell me what are the way's to high-linear amplifier, Since i am working at high frequency i can't use any opamp based global Feedback, now the only one option would be a local feedback. Is there any way to to implement local feedback apart from emitter degeneration. I have emitter degen (~200mv drop or gm*R=6), i can't increase beyond this but i have to get some more linearity. Any kind of suggestion are help full..

Thanks,
raj.

Title: Re: High Linear differential amplifier
Post by RobG on May 28^th, 2013, 10:48am

I'm not sure what you are doing -- are you doing a bipolar open loop amplifier? You could look at Barry Gilbert's work in that area - things like translinear design.

Title: Re: High Linear differential amplifier
Post by Lex on Jun 3^rd, 2013, 2:31am

You could try gm linearization techniques to improve the linearity.

Maybe harmonic cancellation techniques are interesting if you work at very high frequencies.

If you're working on CMOS I guess translinear design is out of the picture.

Title: Re: High Linear differential amplifier
Post by raja.cedt on Jun 3^rd, 2013, 5:22am

Any reference for harmonic cancellation?? Any how thanks for the reply

Thanks,
Raj.