LM13600 Spec Sheet VCO questions

[Scott Gravenhorst, Synthaholic]

I have a copy of the LM13600 OTA spec sheet.  On page 2-527, ther ar 
two VCo circuits, fig:15 = triangle and square, and fig:16 = ramp and 
pulse.

The math for fig 15 shows the output frequency is linear with respect 
to the control current.  Fig 16 shows the frequency of oscillation as 
'approximately' equal to some calculation involving the control 
current.

1) Has anyone any experience with these circuits?  Like are they 
stable?

2) Does the 'approx' operator instead of an equal sign indicate some 
non-linearity or just some leeway, but that linearity is preserved?


-- 
-- Scott G., Synthaholic

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