super nice transconductance amplifiers

[Paul Schreiber]

It's called PDA381. See www.synthtech.com

Paul Schreiber
Synthesis Technology


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From: 	CGS2510.SEP.STUDENT.UCA at CUB.UCA.EDU[SMTP:CGS2510.SEP.STUDENT.UCA at CUB.UCA.EDU]
Sent: 	Thursday, October 02, 1997 8:58 AM
To: 	synth-diy at horus.sara.nl
Subject: 	super nice transconductance amplifiers

I presume a lot of people are familiar with the CA3080,CA3060 and the 
LM13700/LM13600.  Does anyone know of any OTA's that have GOOD signal 
to noise and have linearizing diodes like the 13700's?  I have always 
had problems getting better than about 80dB s/n out of the 13700 and 
never really worried about noise on the CA3080's since I always drove 
the input pair way out of linearity.  The linearizing diode input 
does several amazing feats that I need, but no OTA's that I have ever 
seen are all that great.  It must be a REAL transconductance amp 
also, not one of the AD voltage controlled gain blocks.  It must 
have continuously variable gain, not peicewise continuous or stepped 
gain.