In realation to my function generator project I've found this usefull document:
http://www-inst.eecs.berkeley.edu/~ee100/su06/lab/lab10-ProjectFinish/TheDifferentialPairAsTriangleSineWaveConverter.pdfwhere it is explained how to use and design the log shaper, metioned in the AN-263 document:
http://www.ti.com/lit/an/snoa665c/snoa665c.pdfThis circuit is used to transform a triangle waveform into a sine wave.
Altough the equations are almost easy I don't get how to find the Vt paramater.
Any body can understand how to optained that paramater.
For transistors I'm using a LM394 supermatched transistor paired.
My input triangle wave havw Vpp of 10V on frequency range from 1hz to 1Mhz.
Any body have some else ideas to convert the triangle wave into sine wave.
How you optaine q, T (I think this is the ambient temperature) and k metioned on the definition of Vt. (Vt = (kT)/q)
I've seen circuits using the old style and opsolate AD639 circuit but I want to not use it (24$ on ebay).
Best regards, Alberto.
PS:
Happy Christmas and happy new year to everybody.