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參數資料
| 型號： | 1245-TYPE |
| 英文描述： | Uncooled Laser Transmitter |
| 中文描述： | 非致冷激光發(fā)射器 |
| 文件頁數： | 10/12頁 |
| 文件大小： | 199K |
| 代理商： | 1245-TYPE |
Data Sheet
W3011
September 1999
1 GHz Quadrature Modulator
Lucent Technologies Inc.
7
RFOUT Matching: Basic Open Collector Termination
The W3011 RF output uses an open collector output architecture. To operate properly, this requires that dc bias
current be provided through the output pin (pin 17). Thus, the output matching network must always provide a
shunt dc connection to the positive power supply. Examples of such a connection include a shunt-matching
inductor or a shunt RF choke. Figure 4 illustrates a simple RFOUT matching configuration.
VCC
TO TX SAW FILTER
(50
)
20
19
18
17
Figure 4. W3011 RF Output Diagram
Offset Mixer
W3011 with Offset Mixer Disabled
If the offset mixer in the W3011 is not required for the frequency plan, the offset mixer may be turned off by
connecting the positive supply (VCC) to any or all of pins 11 (LOHN), 12 (LOHP), 13 (LOLN), or 14 (LOLP), as
illustrated in Figure 5 below. Disabling the offset mixer reduces current consumption 2 mA to 3 mA. If pin 11 is
connected to VCC, pins 12, 13, and 14 must be connected to VCC or no-connect (NC). Connect the RF VCO to
either pin 9 or pin 10 through a low-impedance coupling capacitor, and connect the unused pin (10 or 9) through
a similar capacitor to ground.
20
14
12
13
11
1
APC
ENB
10
Q
VCC
TO TX SAW FILTER
VCC
CONNECT VCC TO ANY OF PINS
11—14 TO DISABLE OFFSET
MIXER AND REDUCE POWER
SUPPLY CURRENT
OPTIONAL TERMINATION RESISTOR
I
Figure 5. W3011 Application with Offset Mixer Disabled
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