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Gain of Class AB Vs. Class A - RF Cafe Forums
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lna
Post subject: Gain of Class AB Vs. Class A Posted: Thu Jun
11, 2009 9:56 pm
Captain
Joined: Mon May 04, 2009 6:47
pm
Posts: 22
This maybe a stupid question,
For the same
device biased to class A and class AB, Is the gain of class AB about
3dB lower than class A? It seems to me just half of input power being
amplified and another half of power being cutoff.
Top
IR
Post subject: Re: Gain of Class AB Vs. Class APosted: Fri
Jun 12, 2009 9:10 am
Site Admin
Joined: Mon Jun 27,
2005 2:02 pm
Posts: 373
Location: Germany
The result of lower
biasing means lower gain. If the device has the same retrun loss at
both ports in both classes, then the gain difference is a matter of
the bias level (Idq).
_________________
Best regards,
- IR
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Jeanalmira
Post subject: Re: Gain
of Class AB Vs. Class APosted: Wed Jul 15, 2009 2:24 am
General
Joined: Tue Mar 15, 2005 11:43 pm
Posts: 65
Location:
Singapore
Hi,
Well, I believe the gain here is linear gain.
Class A amplifier operates at linear region, which by saying that the
linear gain is higher compared to Class AB. The advantage of Class AB
is to reduce distortions under nonlinear operations. So Class A and
Class AB serves different purposes in applications and they operate
under different load lines. Usually at typical cascaded amplifiers,
Class A preferable as gain stage (under linear operation/ small signal).
I hope it helps.
Regards,
-Jean
Posted 11/12/2012
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