Photodiode Photodetector

for a photodetector ckt, the OFF to ON phase is faster but ON to OFF is slower. need sharp edges on both sides?

designed a PD ckt in the following configuration. ( vdd-100k-PD-gnd). output is taken from the common point of res-PD. when light falls, PD is ON, o/p goes from HIGH-to-LOW...this edge is fast, tf=2uS. but, when light goes off, the PD turns off, o/p goes from LOW-to-HIGH.. now this edge is much more slower .. tr~40uS.

pls suggest a way to make both edges faster. is it the parasitic capacitance of the resistor or the turning off time of the photodiode?

if you just need faster transition times a Schmidt trigger will do that
if you need the photo-detector to be faster then it is trickier!

There may be some better circuits in here

http://images.google.ca/images?hl=en&source=hp&q=photodetector%20circuit&rlz=1W1GGLR_en&um=1&ie=UTF-8&sa=N&tab=wi

Guru

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Fourier Transform : random signal (Flame Sensor)

how can I tell the positive and negative of this photodiode while connecting it to the given circuit?

Photodiode: http://www.vishay.com/docs/81520/bpw24r.pdf
Circuit (the photodetector circuit/ first one):http://hyperphysics.phy-astr.gsu.edu/hbase/Electronic/photdet.html

The Anode connection is nearest to the tab.
Near the end of the data sheet at your Link,
a drawing marks the leads as C for Cathode
and A for Anode. This is clearer terminology
than 'positive' or 'negative'.

The Anode lead is connected to the Common or 0v
of the circuit shown at the circuit Link