2012A013 - Quantum Devices, Inc.

+V-V

-I

PC Load Line PV Load Line

L=1

L=2

L=4

L=3

Figure 2

L= Illumination

I= Current generated from the photodiode

Load Line = I/RLoad

“Improving the Quality of Life through the Power in Light”

…photovoltaic & photoconductive… …features…

When a photodiode is operated in a photovoltaic mode, the

photodiode is unbiased. During the time that the photodiode operates

with a reverse bias voltage, the operating mode is considered

photoconductive. Figure 2 shows a typical I-V curve for a silicon

photodiode. This graph indicates the increase in relative current to

the increase in illumination at V=0 (short circuit current). The

illumination curves are linear to input light intensity until the

photodiode becomes forward biased, at this point the generated

current starts to flow through the diode. Photodiode open circuit

voltage is where I=0 on the illumination curve (diode is forward

biased) and varies as the logarithm of the illumination level. Both

the photovoltaic load (PV) and the photoconductive (PC) load lines

are indicated in figure 2 as well. As shown, the PV load line

indicates a linear current vs. illumination is generated for

illuminations L=1 and L=2; while the PV load line indicates a non-

linear current vs. illumination for L=3 and L=4 as the diode becomes

forward biased. The PC load line will maintain a linear current vs.

illumination for all illumination levels.

Figures 3a and 3b are typical for photovoltaic operation. Photovoltaic

applications are designed for low noise (reduced dark currents) and the

frequency response of figure 3a will be dependant on load resistance and

the shunting impedance of the photodiode junction capacitance

[1/(2πFC)]. The circuit shown in figure 3b illustrates a transimpedance

amplifier. This amplifier will clamp the photodiode voltage bias to zero

volts. The resultant effective impedance seen by the junction capacitance

will be very low yielding excellent frequency response.

Figures 4a and 4b illustrate circuits typical for photoconductive

applications. A photoconductive mode of operation will enhance the

photodiode speed requirements as the junction capacitance is reduced with

increase in reverse bias. The reverse bias will generate a dark current

proportional to the bias voltage and should be evaluated for the particular

application. The circuits in Figure 4 are similar to the Figure 3 above,

except the photodiodes are operated with a reverse bias.

. offers two high quality, state of the

art, photodiode constructions: Photovoltaic for (PV)

application and Photoconductive for (PC) applications. Due

to the high quality of our design the two series can be used in

both photovoltaic and photoconductive modes.

¾ The PV series is slightly lower in dark current while

designed to minimize the internal series resistance to

enhance the linearity of illumination response levels well

into the forward biased operation point.

¾ The PC series is designed to provide a low junction

capacitance while providing excellent dark current

parameters. The PC series will also provide improved far-

red spectral response.

¾ Linearity Over a Wide Dynamic

Range

¾ Broad Spectral Response

¾ Excellent Responsivity

Low Capacitance

Low Dark Current

High Shunt Resistance

Low Noise

“Improving the Quality of Life through

the Power in Light”

Series

Type

Part

Number

Part

Number

Total Act.

Area Chip Dimen. Responsivity

@880nm

Shunt

Resistance

Dark

Current

At –5V

Capacitance

(typ)

Wire Bond

Contact

Solderable

Contact (mm²) (in)

(min)

(mA)

(min)

(M-Ohm)

Typ.

(nA)

Max.

(nA)

at OV

(pF)

at 3V

(pF)

P.V. 2010A004 2012A004 175 .394 x .787 .55 750 1.30 13.0 20,400 8,160

P.V. 2010A005 2012A005 86.4 .394 x .394 .55 1,500 .660 6. 10,100 4,000

P.V. 2010A006 2012A006 42.1 .394 x .197 .55 3,000 .330 3.3 4,900 2,000

P.V. 2010A007 2012A007 76.2 .197 x .787 .55 1,500 .660 6.6 9,900 4,000

P.V. 2010A008 2012A008 37.7 .197 x .394 .55 3,000 .330 3.3 4,900 2,000

P.V. 2010A009 2012A009 18.3 .197 x .197 .55 6,00 .166 1.66 2,400 960

P.V. 2010A010 2012A010 8.63 .197 x .098 .55 12,000 .083 .83 1,130 450

P.V. 2010A011 2012A011 26.6 .098 x .787 .55 3,000 .330 3.3 4,700 1,900

P.V. 2010A012 2012A012 13.1 .098 x .394 .55 6,000 .166 1.66 2,300 930

P.V. 2010A013 2012A013 6.40 .098 x .197 .55 12,000 .083 .83 1,130 450

P.V. 2010A014 2012A014 3.00 .098 x .098 .55 24,000 .050 .50 530 210

P.V. 2010A015 2012A015 1.33 .098 x .049 .55 48,000 .020 .20 235 94

P.C. 2011A004 2013A004 175 .394 x .787 .55 30 33.0 333 2500 950

P.C. 2011A005 2013A005 86.4 .394 x .394 .55 60 17.0 170 1240 470

P.C. 2011A006 2013A006 42.1 .394 x .197 .55 120 8.30 83.0 600 230

P.C. 2011A007 2013A007 76.2 .197 x .787 .55 60 17.0 170 1220 460

P.C. 2011A008 2013A008 37.7 .197 x .394 .55 120 8.30 83.0 600 229

P.C. 2011A009 2013A009 18.3 .197 x .197 .55 240 4.20 42.0 290 112

P.C. 2011A010 2013A010 8.63 .197 x .098 .55 480 2.10 21.0 140 52

P.C. 2011A011 2013A011 26.6 .098 x .787 .55 120 8.30 83.0 575 218

P.C. 2011A012 2013A012 13.1 .098 x .394 .55 240 4.20 42.0 280 108

P.C. 2011A013 2013A013 6.40 .098 x .197 .55 480 2.10 21.0 140 52

P.C. 2011A014 2013A014 3.00 .098 x .098 .55 960 1.00 10.0 65 25

P.C. 2011A015 2013A015 1.33 .098 x .049 .55 1,920 .55 5.5 29 11

.25cm Series

.25cm x 2.0cm .098 x .787

.25cm x 1.0cm .098 x .394

.25cm x .5cm .098 x .197

.25cm x .25cm .098 x .098

.25cm x .125cm .098 x .049

.5cm Series

.5cm x 2.0cm .197 x .787

.5cm x 1.0cm .197 x .394

.5cm x .5cm .197 x .197

.5cm x .25cm .197 x .098

1cm Series

1cm x 2cm .394 x .787

1cm x 1cm .394 x .394

1cm x .5cm .394 x .197

112 Orbison, P.O. Box 100

Barneveld, WI 53507

•(608)924-3000 •fax: (608)924-3007

www.QuantumDev.com

email: QDISALES@quantumdev.com

Contact your QDI

Representative for more

information….