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Photodiodes Spice Model  

2007-05-07 00:02:55|  分类: 光通信 |  标签: |举报 |字号 订阅

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Photodiodes are used to convert input optical power to electrical current. They typically come with peak wavelengths of 800nm and 940nm (infrared), and are also available for laser diodes. A photodiode is typically characterized by its peak wavelength, sensitivity, dark (leakage) current, output power, and its forward current and capacitance characteristics. The PSpice Model editor can be used to create the diode model using the forward current, reverse breakdown, dark current (reverse leakage), and capacitance curves on the datasheet. Then, use the spectral sensistivity (A/W) for the sensitivity multiplier in the Gpd device.

Here is a model for the Siemens BPY12 photodiode. V(A,C) is the diode voltage. V(P) is the input power (as a voltage).

* A = Anode
* C = Cathode
* P = (light)Power (in Watts) as voltage input
.SUBCKT BPY12 A C P
* Diode models dark (leakage) current, forward current, capacitance and
timing
DPD A C PhotoDet
.MODEL PhotoDet D IS=1.0000E-12 RS=10 CJO=138.22E-12 M=.50663
+ VJ=.3905 ISR=1.2315E-9 NR=4.9950 BV=20 IBV=100.00E-6 TT=1.4427E-9
.ends
* Controlled current source outputs input power multiplied by
sensitivity
GPD C A TABLE {V(P)* 0.60} (0,0) (1,1)

This Figure shows the photodiode model waveform and test circuit:()

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