Re: Photodiode wich is fast enough to detect +50Mhz analog (sinus) signal??
From: John Larkin (jjlarkin_at_highSNIPlandTHIStechPLEASEnology.com)
Date: 07/19/04
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Date: Mon, 19 Jul 2004 13:49:32 -0700
On 19 Jul 2004 13:29:23 -0700, yannick_de_wit@pandora.be (Yannick)
wrote:
>Hi,
>
>I am developing a laser distance meter for my Master thesis. I have
>problems with finding a photodiode where the junction capactitance is
>low enough to detect frequenties higher then 50Mhz(laser diode is
>amplitude modulated with these frequentie). The problem is also with
>the amplifier after the photodiode, wich amplifier is best for this
>purpose? (transconductance amplifier i suppose) i am now doing it with
>discrete components (low noise transistors as common emitter or common
>basis but still the input impedance is to high to detect such high
>frequenties with my current photodiode)
>
>note that the distance is calculated with phase meausurement detection
>and not with time of flight measurement of pulses.
>
>any help is very appreciated!
>
>Yannick
What's your optical wavelength? 50 MHz isn't especially fast for a PIN
or APD diode detector. An integrated PIN-TIA would be convenient (but
be careful that the AGC doesn't cause phase shift errors) or you could
use a tuned RF amplifier in the front-end to optimize matching and
s/n.
John
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