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Old 3rd June 2002, 06:18 PM   #11
tiroth is offline tiroth  United States
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Join Date: Dec 2001
Location: Pittsburgh, PA, USA
I just performed some tests on an actual 5687 in LTP arrangement, at the following operating points:

Vp=140, 130, 120
Bias=3mA, 9.5mA, 14mA

At 3mA bias, the simulated distortion figures were very close to measured. At 9.5mA and 14mA, the simulated figures were within 0.5dB of actual for overall distortion as well as 2nd and 3rd harmonic. (higher order harmonics were not measurable)

At least at these operating points, the theoretical model is extremely accurate.
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Old 7th June 2002, 07:15 AM   #12
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Join Date: Feb 2001
Location: earth
Default what's an LTP arrangement

would you mind showing us(me) what the LTP arrangement is?

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Old 7th June 2002, 01:27 PM   #13
tiroth is offline tiroth  United States
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Join Date: Dec 2001
Location: Pittsburgh, PA, USA
You can find the circuit on my site:


I'll try to update this page this weekend with my new test results.
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