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John Larkin  
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 More options Aug 17 2012, 12:13 am
Newsgroups: sci.electronics.design
From: John Larkin <jjlar...@highNOTlandTHIStechnologyPART.com>
Date: Thu, 16 Aug 2012 21:13:32 -0700
Local: Fri, Aug 17 2012 12:13 am
Subject: Re: resetting a filter
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On Thu, 16 Aug 2012 20:33:19 -0700, WoolyBully

<WoolyBu...@arcticicemasses.org> wrote:
>On Thu, 16 Aug 2012 10:07:46 -0700, John Larkin
><jlar...@highlandtechnology.com> wrote:

>>JT said that it's caused by the gain/phase of the opamp loop, but he
>>won't explain it past that silly hand-waving.

>  You are aware of how a feedback based control loop operates, right?

Yup. I simulated and designed my first closed-loop control system when
I was 19. It was 32,000 horsepower.

>  Can you not envision an inherent oscillation based on raw physical
>timing constraints under the right circumstances (overdriven, etc.)?

The opamp has a gain-bandwidth product of 800 KHz. The transistor is
oscillating at 100 MHz. The loop gain/phase behavior is irrelevant.

>  You saying things, among men, like "silly hand waving" is pretty
>unprofessional.

Well, he hasn't explained what he meant. And he won't.

--

John Larkin                  Highland Technology Inc
www.highlandtechnology.com   jlarkin at highlandtechnology dot com  

Precision electronic instrumentation
Picosecond-resolution Digital Delay and Pulse generators
Custom timing and laser controllers
Photonics and fiberoptic TTL data links
VME  analog, thermocouple, LVDT, synchro, tachometer
Multichannel arbitrary waveform generators


 
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