[Laser] OPT-101 vs PIN diode

[F1AVYopto at aol.com]

Dans un e-mail daté du 13/12/2006 19:53:20  Paris, Madrid, 
skavanagh73 at yahoo.ca a écrit :

>As I understand it the  bandwidth of the K3PGP front
>end (and similar designs) is controlled by  the
>parallel combination of a resistance (gate-to-ground
>resistor,  FET input resistance, photodiode resistance
>and stray leakage in  parallel) and a capacitance
>(photodiode capacitance and FET input  capacitance in
>parallel, plus stray capacitance from  wiring).

>I agree that some of these quantities are a bit  hard
>to define.

The PGP front end can be bandwidth improved by a  low impedance feed back at 
the photodiode cold point.
A very good work had  been done by Kalevi Hyyppa and Klas Ericson to avoid 
the noise due to the  classical big resistor feed back effect.
The pdf file can be loaded  at:
http://pageperso.aol.fr/F1AVYopto/opto/Hyyppa-lownoisephotodiodepreampPIF.pdf

Yves  F1AVY
http://pageperso.aol.fr/YvesF1AVY/