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参数资料
| 型号： | HFCT-5218M |
| 英文描述： | 622 Mbit/s SMF (40km) 1x9 Transceiver for SONET/SDH. ATM (OC-12): Metalized housing |
| 中文描述： | 622 Mbit / s的单模光纤（40公里）1x9收发器用于SONET / SDH的。自动柜员机（的OC - 12）：金属化住房 |
| 文件页数： | 4/10页 |
| 文件大小： | 224K |
| 代理商： | HFCT-5218M |
3
Functional Description
Receiver Section
Design
The receiver section contains an
InGaAs/InP photo detector and a
preamplifier within the receptacle,
coupled to a postamp/decision
circuit on a separate circuit board.
The postamplifier is ac coupled to
the preamplifier as illustrated in
Figure 1. The coupling capacitor
is large enough to pass the
SONET/SDH test pattern at
155 MBd without significant
distortion or performance penalty.
If a lower signal rate, or a code
which has significantly more low
frequency content is used,
sensitivity, jitter and pulse
distortion could be degraded.
Figure 1 also shows a filter
network which limits the
bandwidth of the preamp output
signal. The filter is designed to
bandlimit the preamp output
noise and thus improve the
receiver sensitivity.
These components will also
reduce the sensitivity of the
receiver as the signal bit rate is
increased above 155 MBd.
Noise Immunity
The receiver includes internal
circuit components to filter
power supply noise. Under some
conditions of EMI and power
supply noise, external power
supply filtering may be necessary.
If receiver sensitivity is found to
be degraded by power supply
noise, the filter network illustrated
in Figure 2 may be used to improve
performance. The values of the
filter components are general
recommendations and may be
changed to suit a particular
system environment. Shielded
inductors are recommended.
Terminating the Outputs
The PECL Data outputs of the
receiver may be terminated with
the standard Thevenin-equivalent
50 ohm to VCC - 2 V termination.
Other standard PECL terminating
techniques may be used.
The two outputs of the receiver
should be terminated with
identical load circuits to avoid
unnecessarily large ac current in
VCC. If the outputs are loaded
identically the ac current is largely
nulled. The Signal Detect output
of the receiver is PECL logic and
must be loaded if it is to be used.
The Signal Detect circuit is much
slower than the data path, so the
ac noise generated by an
asymmetrical load is negligible.
Power consumption may be
reduced by using a higher than
normal load impedance for the
Signal Detect output.
Transmission line effects are not
generally a problem as the
switching rate is slow.
The Signal Detect Circuit
The Signal Detect circuit works by
sensing the peak level of the
received signal and comparing
this level to a reference.
Figure 1 - Receiver Block Diagram
Figure 2 -
p Filter Network for Noise Filtering
V
CC
100 nF
3.3 H
100 nF
10 F
FILTERED V
CC to DATA LINK
+
RECEIVER
RECEPTACLE
TRANS-
IMPEDANCE
PRE-
AMPLIFIER
FILTER
GND
LIMITING
AMPLIFIER
PECL
OUTPUT
BUFFER
PECL
OUTPUT
BUFFER
DATA OUT
SIGNAL
DETECT
CIRCUIT
SD
DATA OUT
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