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Design >> Mixed-Signal Design >> large signal bandwidth of amp
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Message started by chaojixin on Jul 25^th, 2011, 5:52pm

Title: large signal bandwidth of amp
Post by chaojixin on Jul 25^th, 2011, 5:52pm

i read the datasheet of TI's 'ths3121' and find this term which is somewhat smaller than the small signal bandwidth. what's the large signal bandwidth and what's the relationship between large signal bandwidth, small signal bandwidth and slew rate?
any reference about the analysis of 'large signal bandwidth'?

thanks!

Title: Re: large signal bandwidth of amp
Post by buddypoor on Jul 25^th, 2011, 11:49pm

The large signal bandwidth (caused by the slew rate) is:

BW=SR/(2*Pi*umax) with SR=slew rate and umax=amplitude of the maximum possible sinusoidal output voltage.

Note that BW as well as SR are defined for an opamp with large negative feedback (some times 100% if stability allows).
There is no direct relation to the small signal bandwidth.

Title: Re: large signal bandwidth of amp
Post by Jewel Jubic on Aug 8^th, 2011, 4:54am

It can be described on the basis of front end's ability to get a signal from because the distortion performance of an amplifier does not remain constant..

Title: Re: large signal bandwidth of amp
Post by buddypoor on Aug 8^th, 2011, 5:21am

Jewel Jubic wrote on Aug 8^th, 2011, 4:54am:

It can be described on the basis of front end's ability to get a signal from because the distortion performance of an amplifier does not remain constant..

Does anybody understand? I am always willing to learn but....