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#1
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
As promised.
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#2
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
And the author was a student at the time -- impressive.
Hmm... I wonder what he's up to these days? Good chance he's still alive! |
#3
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Wed, 10 Oct 2007 19:57:29 -0700, The Phantom
wrote: As promised. Cool; thanks. Here are a couple of sims. RCboost2 is the one I accidentally discovered ca 1975, when a thing oscillated that wasn't supposed to. John |
#4
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Wed, 10 Oct 2007 21:34:47 -0700, John Larkin
wrote: On Wed, 10 Oct 2007 19:57:29 -0700, The Phantom wrote: As promised. Cool; thanks. Here are a couple of sims. RCboost2 is the one I accidentally discovered ca 1975, when a thing oscillated that wasn't supposed to. Your first example is identical in topology to the first example in Vorperian's paper. Your resistors even have the same values he uses. Joel, Vorperian has a footnote referenced in the first sentence of section 7.2 that didn't get included in your scan. What is it, please? John |
#5
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Thu, 11 Oct 2007 05:16:03 -0700, The Phantom
wrote: On Wed, 10 Oct 2007 21:34:47 -0700, John Larkin wrote: On Wed, 10 Oct 2007 19:57:29 -0700, The Phantom wrote: As promised. Cool; thanks. Here are a couple of sims. RCboost2 is the one I accidentally discovered ca 1975, when a thing oscillated that wasn't supposed to. Your first example is identical in topology to the first example in Vorperian's paper. Your resistors even have the same values he uses. I picked that up somewhere else on the web, no doubt propagated from his original. My second circuit is based on my accidental topology, with the same values plugged in for convenience. The actual circuit, part of an intercom/cargo winch control system for the C5A, had different values, which I can't remember, and oscillated around 40 Hz. John |
#6
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
Hi Phantom,
"The Phantom" wrote in message ... Joel, Vorperian has a footnote referenced in the first sentence of section 7.2 that didn't get included in your scan. What is it, please? Ref. 1 is: J. Holbrock, "Laplace Transform for Electronic Engineers," Pergamon Press, Oxford, 1966. Kind of an odd reference given the supporting text ("The possibility of obtaining any voltage or current gain...") -- must be a book that's heavy on theory (I don't have a copy). |
#7
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
"The Phantom" wrote in message ... As promised. [Useful reading. But yes, there's caveats with the 'x2' limit.] Attached, a contrived, LTspice structure, giving 2 gain. |
#8
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Fri, 12 Oct 2007 01:55:12 +0100, "john jardine"
wrote: "The Phantom" wrote in message .. . As promised. [Useful reading. But yes, there's caveats with the 'x2' limit.] Attached, a contrived, LTspice structure, giving 2 gain. In the Epstein paper, he says that the gain is 2 if the network is a general ladder network. At the end of the paper, he admits he has now formal proof. The example you've given would seem to indicate that, using ideal components with mathematically unlimited values, the gain obtainable is unbounded. |
#9
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Fri, 12 Oct 2007 01:55:12 +0100, "john jardine"
wrote: "The Phantom" wrote in message .. . As promised. [Useful reading. But yes, there's caveats with the 'x2' limit.] Attached, a contrived, LTspice structure, giving 2 gain. Cool. It did seem like cascading could be done without theoretical limit. The voltage looks like it's increasing exponentially with stage count. I'll check Mouser for those parts. John |
#10
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Fri, 12 Oct 2007 02:06:53 -0700, The Phantom wrote:
On Fri, 12 Oct 2007 01:55:12 +0100, "john jardine" wrote: "The Phantom" wrote in message . .. As promised. [Useful reading. But yes, there's caveats with the 'x2' limit.] Attached, a contrived, LTspice structure, giving 2 gain. In the Epstein paper, he says that the gain is 2 if the network is a general ladder network. At the end of the paper, he admits he has now Jeeesh . What an awkward typo. This should say "...he admits he has NO formal poof." formal proof. The example you've given would seem to indicate that, using ideal components with mathematically unlimited values, the gain obtainable is unbounded. |
#11
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Fri, 12 Oct 2007 11:24:17 -0700, John Larkin
wrote: On Fri, 12 Oct 2007 01:55:12 +0100, "john jardine" wrote: "The Phantom" wrote in message . .. As promised. [Useful reading. But yes, there's caveats with the 'x2' limit.] Attached, a contrived, LTspice structure, giving 2 gain. Cool. It did seem like cascading could be done without theoretical limit. The voltage looks like it's increasing exponentially with stage count. I simulated it too. John has 3 orders of magnitude increase in impedance level per stage. With only two orders increase, the gain was around 1.8 after 7 stages. With one order increase in impedance level per stage, the gain was decreasing with each stage except for the last stage (which is unloaded), where the gain does increase. I'll check Mouser for those parts. John |
#12
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Epstein paper - Synthesis of Passive RC Networks with Gains Greater than Unity.pdf
On Fri, 12 Oct 2007 13:19:59 -0700, The Phantom
wrote: On Fri, 12 Oct 2007 11:24:17 -0700, John Larkin wrote: On Fri, 12 Oct 2007 01:55:12 +0100, "john jardine" wrote: "The Phantom" wrote in message ... As promised. [Useful reading. But yes, there's caveats with the 'x2' limit.] Attached, a contrived, LTspice structure, giving 2 gain. Cool. It did seem like cascading could be done without theoretical limit. The voltage looks like it's increasing exponentially with stage count. I simulated it too. John has 3 orders of magnitude increase in impedance level per stage. With only two orders increase, the gain was around 1.8 after 7 stages. With one order increase in impedance level per stage, the gain was decreasing with each stage except for the last stage (which is unloaded), where the gain does increase. The within-stage parts ratios, currently 100:1, could also probably be optimized for the cascade situation. A lower ratio might give a little less boost per stage, but might make the cascading situation better, so the stage-stage impedance ratios might come down. Complex! John |
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