HMC690 Datasheet, PDF (5/10 Pages) Hittite Microwave Corporation – 10 Gbps TRANSIMPEDANCE AMPLIFIER

v04.0709
Supply Current vs. Supply Voltage
Over Temperature
120
110
100
90
5
80
+25C
70
+85C
- 55C
60
3.1
3.2
3.3
3.4
3.5
SUPPLY VOLTAGE (V)
HMC690
10 Gbps TRANSIMPEDANCE
AMPLIFIER
Optical Sensitivity Calculation
Optical sensitivity is determined from the input-referred rms noise current, IN. To achieve a bit error rate of 1E^-12 , the
signal-to-noise ratio must be 14:1.
( ) ^{SNR IN re + 1}
S = 10 log
xx
x 1000 dBm
2
re - 1
Where
S
SNR
I_N
r_e
= sensitivity (dBm)
= signal to noise ratio (dB)
= input-referred rms noise current (A)
= photodetector responsitivity (A/W)
= extinction ratio (dB)
Optical Minimum Output Swing at Sensitivity Limit Calculation
The typical optical sensitivity is -19 dBm. At the input level, the voltage swing at output of the HMC690 is calculated
as follows:
( ) ^{OMA re + 1}
S_ave = 10 log
x
2 re - 1
Where
S_ave
OMA
= average sensitivity (dBm)
= optical modulation amplitude (Wp-p)
r_e
= extinction ratio (dB)
5-6
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