[sdiy] Dynamics in OTA's!

[harrybissell at wowway.com]

2mA is the death limit... in practice you cannot (should not)
exceed 1mA

H^) harry



On Sat, 27 Dec 2008 13:28:40 -0800, David G. Dixon wrote
> Karl,
> 
> I think the LM13700 datasheet spells this out pretty well.  Here's 
> the link:
> 
> http://cache.national.com/ds/LM/LM13700.pdf
> 
> Basically, transconductance g_m = 19.2*I_abc at 25°C, where I_abc is 
> the bias current input, such that I_out = g_m * V_in, where V_in is the
> differential voltage input.  If I'm not mistaken, that's all there 
> is to it!
> 
> The absolute maximum bias current is 2 mA, but I think the response gets
> seriously non-linear long before this limit is reached.  The linearizing
> diodes fix this somewhat.
> 
> David G. Dixon
> Professor
> Department of Materials Engineering
> University of British Columbia
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> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of karl dalen
> Sent: Saturday, December 27, 2008 11:21 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Dynamics in OTA's!
> 
> How do i calcullate the dynamic range of the LM13700?
> Gm x Iabc, perhaps the difference of input mV and output V v.s Iabc?
> 
> My well used Hal Chamberlin dosent tell! :-(
> 
> KD
> 
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Harry Bissell & Nora Abdullah 4eva