From: Paul Burridge
Subject: Re: Transistor amplifiers v. frequency in SPICE
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Date: Thu, 16 Jan 2003 20:49:23 +0000
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On Thu, 16 Jan 2003 20:32:36 +0000, Terry Pinnell
>...but I suspect that's because you're now using 100 nF caps. I
>interpreted your reply to Win as confirming his schematic was correct,
>but I've since found your earlier ASCII with 100 nF. If so, it
>simulates a gain of 177, squaring with your hand calculation.
Indeed, Terry. I've been using quite a range of values for coupling
and bypass caps depending on the frequency the simulation was run at.
Sometimes I've forgotten to change the values back to their optimums
before posting the schematic up. Apologies for any confusion. BTW, if
I were to get the AC sweep function running properly, I guess there's
no way one can modify the cap values to reflect the increasing input
frequency during the course of a sweep simulation? I mean to eliminate
all other variables apart from that which it is desired to investigate
- in this case the frequency versus gain of the active device
"What is now proved was once only imagin'd"
- William Blake, 1793