Re: Fast switching current mirrors
From: Kevin Aylward (salesEXTRACT_at_anasoft.co.uk)
Date: 06/30/04
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Date: Wed, 30 Jun 2004 07:55:15 +0100
John Larkin wrote:
> On Tue, 29 Jun 2004 20:14:34 +0100, "Kevin Aylward"
> <salesEXTRACT@anasoft.co.uk> wrote:
>
>
>
>>
>> Its the trade off thing again g(power, sigma, frequency) = 0
>>
>> http://www.anasoft.co.uk/EE/bipolarpafl/bipolarpafl.html
>>
>> Lower power means something *has* to give, either speed or accuracy.
>> There is no such thing as a free lunch.
>
>
> Then there's the very zen-like distributed amplifier that puts
> transistors in parallel without putting them in parallel. This
> transcends Gm/c limits; doesn't work with bipolars, though.
>
I am only vaguely familiar with this method, but I very much doubt it
gets around what I posted. Its not a direct Gm/c limit. Its a combined
power, speed, accuracy limit. The "fundamental" physics limit, in
principle allows any speed, providing one sacrifices power or accuracy,
or both. adding devices will increase the current.
Kevin Aylward
salesEXTRACT@anasoft.co.uk
http://www.anasoft.co.uk
SuperSpice, a very affordable Mixed-Mode
Windows Simulator with Schematic Capture,
Waveform Display, FFT's and Filter Design.
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