VSC7810X 查看數據表（PDF） - Vitesse Semiconductor

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VSC7810X

Photodetector/transimpedance amplifier for optical communication. 5V supply

Vitesse Semiconductor 

VSC7810

Data Sheet

NOTES ON MEASUREMENT CONDITIONS AND APPLICATIONS

Note 1: Noise Measurement Method

3GHz BW

Hybrid Coupler

P1

P2

DUT

Board

Power Meter

HP 437B

with

8481D

Power Sensor

rms

Output

Noise

The noise voltage, (Vn), is calculated from the Output Noise Power, (Pn), into 50Ω.

Vn = Pn • 50

The noise voltage, Vn, at the output is referred back to the noise power at the input through the responsivity R

(with R in volts/watts):

NEP = V-----n-

R

The bit error rate can be expressed as:

e (-Q2/2)

BER =

.

√2πQ

where,

For a BER = 1×10–12 , the parameter Q = 7.

The sensitivity(s) at a bit error rate of 1×10–12 is calculated as follows:

( ) S = 10 log10

Q

NEP

1mW

,

where the NEP is in units of milliwatts and S is in dBm, respectively.

4 of 16

G52145, Rev 4.2

4/4/02

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