The Designer's Guide Community Forum
https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> comparator bandwidth https://designers-guide.org/forum/YaBB.pl?num=1363952591 Message started by lhlbluesky_lhl on Mar 22nd, 2013, 4:43am |
Title: comparator bandwidth Post by lhlbluesky_lhl on Mar 22nd, 2013, 4:43am in normal case, comparator is used in open-loop, not in closed-loop as feedback-amplifier, so, how to decide the -3db bandwidth of open-loop comparator? is there some formula or guide for the -3db bandwidth calculation of open-loop comparator? thanks. |
Title: Re: comparator bandwidth Post by wave on Mar 22nd, 2013, 10:31am Why not look at Propagation Delay instead? |
Title: Re: comparator bandwidth Post by loose-electron on Mar 22nd, 2013, 4:39pm You are trying to determine the BW of a non linear device. That doesn't really make sense. BW for a linerar device, yes, but comparators are typically characterized as a function of propagation delay or response time characteristics. |
Title: Re: comparator bandwidth Post by raja.cedt on Mar 23rd, 2013, 2:28am Hello, in addition to jerry comments, there is lot to estimate for sampler and on the top of that bandwidth doesn't make scene much. Have a look at this paps 1. Time Resolution of NMOS Sampling Switches Used on Low-Swing Signals 2.Characterizing Sampling Aperture of Clocked Comparators Have fun, Raj, |
Title: Re: comparator bandwidth vs Propagation Delay Post by weber8722 on Apr 11th, 2013, 4:56am Hi, best check the delay for different input overdrive, e.g. have one input at 1V and the other with puls from a=0.9V to b=1.05V. Then vary both a and b in a loop. You will see that the delay becomes shorter for large b and large a!! So there is no single number which describes such highly nonlinear circuit as a comparator. Also there are different parts in response time: like pure delay (to get out of saturation, then a part for rise or fall time. :) :) Bye Stephan |
The Designer's Guide Community Forum » Powered by YaBB 2.2.2! YaBB © 2000-2008. All Rights Reserved. |