[sdiy] improved dynamic range diffpair-vca

[HOSHUYAMA]

Hello Aaron,

Actually, what I saw the circuit topology was a patent 
application (In Japan, almost all the patent applications 
becomes public after one and a half years.) not a filed patent.

A couple of years ago, I saw the same structure in a 
Japanese electronics book published in 80's.
I guess, the structure was not patented.

Best,

Sam Hoshuyama
Saitama, JAPAN

From: Aaron Lanterman <lanterma at ece.gatech.edu>
Subject: Re: [sdiy] improved dynamic range diffpair-vca
Date: 2007/04/25 07:46:47
> 
> On Tue, 24 Apr 2007, np wrote:
> 
> > http://www5b.biglobe.ne.jp/~houshu/synth/Vca0302.gif
> >
> > It's a long tailed pair with two extra transistors working as diodes. Not the 
> > same configuration as the linearization diodes we have in some OTA's. I gave
> 
> Anybody seen the patent this is based on?
> 
> - Aaron
> 
> -----------------------------------------------------------------------------
> 
> Dr. Aaron Lanterman, Asst. Prof.
> and Demetrius T. Paris Junior Prof.  Voice:  404-385-2548
> College of Electri. and Comp. Eng.   Fax:    404-894-8363
> Georgia Institute of Technology      E-mail: lanterma at ece.gatech.edu
> Mail Code 0250                       Web:    users.ece.gatech.edu/~lanterma
> Atlanta, GA 30332                    Office: Centergy 5212
> 
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>