pulse response overshoot in a follower configuration
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From: jch4416 on 9 Aug 2010 17:18 Hello, Is anyone familiar with any techniques for reducing overshoot in the pulse response of a unity gain op amp follower configuration? Thanks, Jim --------------------------------------- Posted through http://www.Electronics-Related.com
From: Tim Wescott on 9 Aug 2010 17:24 On 08/09/2010 02:18 PM, jch4416 wrote: > Hello, > > Is anyone familiar with any techniques for reducing overshoot in the pulse > response of a unity gain op amp follower configuration? Need more detail! The simplest thing to do would be to put an RC filter ahead of the op-amp: ___ |\ o------|___|----o-------|+\ | | >-o----o | .--|-/ | | | |/ | --- | | --- '-------' | | === GND (created by AACircuit v1.28.6 beta 04/19/05 www.tech-chat.de) But this depends on your source impedance being controlled, or being guaranteed to be significantly less than your series resistance. -- Tim Wescott Wescott Design Services http://www.wescottdesign.com Do you need to implement control loops in software? "Applied Control Theory for Embedded Systems" was written for you. See details at http://www.wescottdesign.com/actfes/actfes.html
From: Jim Thompson on 9 Aug 2010 17:40 On Mon, 09 Aug 2010 16:18:21 -0500, "jch4416" <otter30(a)n_o_s_p_a_m.bellsouth.net> wrote: >Hello, > >Is anyone familiar with any techniques for reducing overshoot in the pulse >response of a unity gain op amp follower configuration? > >Thanks, >Jim > Yes :-) Oh Lord, I apologize... I just couldn't resist ;-) ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Spice is like a sports car... Performance only as good as the person behind the wheel.
From: John Larkin on 9 Aug 2010 18:00 On Mon, 09 Aug 2010 16:18:21 -0500, "jch4416" <otter30(a)n_o_s_p_a_m.bellsouth.net> wrote: >Hello, > >Is anyone familiar with any techniques for reducing overshoot in the pulse >response of a unity gain op amp follower configuration? > >Thanks, >Jim > What opamp, what swing, and what speed? John
From: miso on 9 Aug 2010 18:18
On Aug 9, 2:18 pm, "jch4416" <otter30(a)n_o_s_p_a_m.bellsouth.net> wrote: > Hello, > > Is anyone familiar with any techniques for reducing overshoot in the pulse > response of a unity gain op amp follower configuration? > > Thanks, > Jim > > --------------------------------------- > Posted throughhttp://www.Electronics-Related.com If the overshoot is due to capacitive loading, you can insert a resistor in series with the output, but in the feedback loop. This is in the National apps. If the amp itself has overshoot, I don't see any really good solution unless it is externally compensated. I suppose you could divide the signal by two and then set up the op amp for a gain of two. That would increase the phase margin. |