[sdiy] Dynamics in OTA's!

[David G. Dixon]

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
309-6350 Stores Road
Vancouver, B.C.  V6T 1Z4
Canada
 
Tel 1-604-822-3679
Fax 1-604-822-3619
 
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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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