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參數(shù)資料
| 型號(hào)： | HFBR2446K |
| 英文描述： | Low Cost, Miniature Fiber Optic Components with ST, SMA, SC and FC Ports |
| 中文描述： | 低成本，微型光纖器件與ST，形狀記憶合金，SC和FC端口 |
| 文件頁數(shù)： | 18/31頁 |
| 文件大小： | 657K |
| 代理商： | HFBR2446K |
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63
Recommended Drive
Circuits
The circuit used to supply current
to the LED transmitter can
significantly influence the optical
switching characteristics of the
LED. The optical rise/fall times
and propagation delays can be
improved by using the appro-
priate circuit techniques. The
LED drive circuit shown in
Figure 11 uses frequency com-
pensation to reduce the typical
rise/fall times of the LED and a
small pre-bias voltage to minimize
propagation delay differences
that cause pulse-width distortion.
The circuit will typically produce
rise/fall times of 3 ns, and a total
jitter including pulse-width dis-
tortion of less than 1 ns. This
circuit is recommended for appli-
cations requiring low edge jitter
or high-speed data transmission
at signal rates of up to 155 MBd.
Component values for this circuit
can be calculated for different
LED drive currents using the
equations shown below. For
additional details about LED
drive circuits, the reader is
encouraged to read Hewlett-
Packard Application Bulletin 78
and Application Note 1038.
( )
(V
CC
- V
F
) + 3.97 (V
CC
- V
F
- 1.6 V)
R
y
= –––––––––––––––––––––––––––––––
I
F ON
(A)
(5 - 1.84) + 3.97 (5 - 1.84 - 1.6)
R
y
= –––––––––––––––––––––––––––––
0.100
1 R
R
= – ––––
2
3.16 + 6.19
R
y
= ––––––––––– = 93.5
0.100
2
93.5
––––
R
EQ2
(
) = R
X1
- 1
R
X1
=1
= 11.8
R
X2
= R
X3
= R
X4
= 3(R
EQ2
)
R
EQ2
= 11.8 - 1 = 10.8
R
X1
(
)
C(pF) =2000(ps)
R
X2
= R
X3
= R
X4
= 3(10.8) = 32.4
11.8
Example for I
F ON
= 100 mA: V
F
can be
obtained from Figure 9
(= 1.84
V
).
C =2000 ps
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相關(guān)代理商/技術(shù)參數(shù) |
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| HFBR2446M | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Low Cost, Miniature Fiber Optic Components with ST, SMA, SC and FC Ports |
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| HFBR2446TB | 制造商:AGILENT 制造商全稱:AGILENT 功能描述:Low Cost, Miniature Fiber Optic Components with ST, SMA, SC and FC Ports |
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