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參數資料
| 型號： | 1245-TYPE |
| 英文描述： | Uncooled Laser Transmitter |
| 中文描述： | 非致冷激光發射器 |
| 文件頁數： | 11/12頁 |
| 文件大小： | 199K |
| 代理商： | 1245-TYPE |
W3011
Data Sheet
1 GHz Quadrature Modulator
September 1999
8
Lucent Technologies Inc.
Offset Mixer (continued)
W3011 Using Offset Mixer
If the W3011 offset mixer is required, two VCOs must be connected (see Figure 6). A low-frequency (VHF)
oscillator may be dc-coupled to either pin 13 (LOLN) or pin 14 (LOLP) if the VCO contains a dc-blocking
capacitor at its output. Otherwise, use a low-impedance series capacitor between the VCO output and the LOL
input. The other LOL pin must be dc-grounded (no external capacitor for the grounded pin). As shown in Figure
1, there is a 50
termination resistor on chip, connected between pins 13 and 14.
In the same way, as shown in Figure 6, one of the pins 11 (LOHN) or 12 (LOHP) must be connected to dc
ground. The other pin is connected to a high-frequency (UHF) VCO, using either dc coupling (if the VCO contains
a dc-blocking capacitor at its output) or a low-impedance series-coupling capacitor. There is also a 50
termination resistor on chip connected between pins 11 and 12.
When the offset mixer is used, it is necessary to filter the offset mixer output signal with a parallel-tuned LC filter
between pins 9 and 10. The resonant frequency of this filter should be approximately the center of the transmit
RF band (for example, about 920 MHz for PDC 800). The filter should be adjusted for lowest EVM at RFOUT.
20
14
12
13
11
1
APC
ENB
10
I
Q
VCC
RFOUT
LOL VCO
LOH (UHF) VCO
9
φ
Figure 6. W3011 Application Using Offset Mixer
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