Gain Structure and Peaking

jbmeyer13 Junior Member Posts: 67	Gain Structure and Peaking Apr 22, 2015 9:48:55 GMT -5 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jbmeyer13 on Apr 22, 2015 9:48:55 GMT -5 What if any relationship is their between gain structure and peaking? If gain is increased does that also amplify the peaking?

mastertech
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Posts: 3,538

Gain Structure and Peaking Apr 22, 2015 22:23:33 GMT -5

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Post by mastertech on Apr 22, 2015 22:23:33 GMT -5

Welcome Justin.

I guess an answer would have to be based on a more specific question, lol. A general answer would probably be that increasing gain of a signal does not necessarily mean an overshoot, requiring peaking. Does that help? LOL

EDIT:
I also posed your question to someone else, more involved in this area and here was the reply:

" I'm pretty sure that it does. Not as much as the lower freqs, though. Gain x BW = Gain BW product. As the gain part increases the BW will have to decrease to keep the Gain BW product the same."

Still not sure if this is what your looking for without being a little more specific.

Last Edit: Apr 23, 2015 9:42:15 GMT -5 by mastertech

MT

jbmeyer13
Junior Member

Posts: 67

Gain Structure and Peaking Apr 23, 2015 17:29:56 GMT -5

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Post by jbmeyer13 on Apr 23, 2015 17:29:56 GMT -5

Apr 22, 2015 22:23:33 GMT -5 mastertech said:

Welcome Justin.

I guess an answer would have to be based on a more specific question, lol. A general answer would probably be that increasing gain of a signal does not necessarily mean an overshoot, requiring peaking. Does that help? LOL

EDIT:
I also posed your question to someone else, more involved in this area and here was the reply:

" I'm pretty sure that it does. Not as much as the lower freqs, though. Gain x BW = Gain BW product. As the gain part increases the BW will have to decrease to keep the Gain BW product the same."

Still not sure if this is what your looking for without being a little more specific.

So If I understand the second part correctly as the gain is increased the peaking would have to decrease. I suppose the inverse is also true; as gain is decreased the peaking would have to be increased. Funny because I would have thought it would be the other way around

nashou
Unmoderated Off Topic

Tech in Training.....

Posts: 1,239

Gain Structure and Peaking Apr 23, 2015 20:36:17 GMT -5

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Post by nashou on Apr 23, 2015 20:36:17 GMT -5

Read a few of these. Ignore trying to understand all the equation mumbo jumbo and read between the lines so to say. there is some good info here.

Read his Foot notes on this one.

www.k-state.edu/ksuedl/publications/Technote%209%20-%20A%20Starting%20Point%20for%20Insuring%20Op%20Amp%20Stability.pdf

www.ti.com.cn/cn/lit/an/sloa013a/sloa013a.pdf

www.ti.com/lit/an/slyt383/slyt383.pdf

electronicdesign.com/analog/reduce-amplifier-noise-peaking-improve-snr#comments

www.kennethkuhn.com/students/ee431/op_amp_frequency_response.pdf

gjaky
Master Tech

Posts: 642

Gain Structure and Peaking Apr 25, 2015 2:07:38 GMT -5 nashou likes this

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Post by gjaky on Apr 25, 2015 2:07:38 GMT -5

The key is the slew rate here, every system has its slew rate limitation (typically given in: V/us), so without knowing how far to the edge is the system in question is running you might have to increase the peaking with higher gain, or might not. Also, since we use multiple systems cascaded with each having its own slew rate limitation, the answer also depending on where is the gain increased within the system.

Post by jbmeyer13 on Apr 22, 2015 9:48:55 GMT -5

Post by mastertech on Apr 22, 2015 22:23:33 GMT -5

Post by jbmeyer13 on Apr 23, 2015 17:29:56 GMT -5

Post by nashou on Apr 23, 2015 20:36:17 GMT -5

Post by gjaky on Apr 25, 2015 2:07:38 GMT -5

Shoutbox