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參數(shù)資料
型號: 1243-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(shù): 1/12頁
文件大?。?/td> 199K
代理商: 1243-TYPE
W3011
1 GHz Quadrature Modulator
Data Sheet
September 1999
Features
+ Guaranteed performance at 2.7 V power supply
+ Output power of 3 dBm into 50 load (single-
ended) with 3 V operation
+ Direct RF modulation with or without offset mixer
+ Automatic power control (APC) capability
+ Accurate 90° phase shifter for carrier
+ Double-balanced active mixers minimize carrier
feedthrough (origin offset)
+ Low-current sleep mode
Applications
+ PDC 800 and American digital cellular mobile
terminals
+ Cellular base stations
Description
The W3011 1 GHz Quadrature Modulator is a
monolithic integrated circuit that provides direct
modulation of an RF carrier by I & Q baseband
inputs. It is particularly suited for use in mobile and
handheld cellular telephones designed to the IS-136
(North American 824 MHz to 849 MHz), PDC
(Japan RCR-STD27 889 MHz to 958 MHz), and
other digital personal-communications standards.
The circuit block diagram is shown in Figure 1. From
two LO signals, LOL and LOH, the offset mixer
produces an internal LO signal, which prevents the
external VCOs from being pulled by the large
transmitted signal. The phase shifter splits the LO
signal into two carriers with 90° phase separation
and equal amplitude.
These signals are fed to the in-phase (I) and
quadrature-phase (Q) double-balanced mixers. The
resulting signals are summed and fed into the output
amplifier. This amplifier can provide 0 dBm linear
output power, minimum, into a 50
load.
The output power can be attenuated up to 50 dB by
applying a control voltage to the APC input.
Nominally, the output power is at maximum
(+3 dBm) with VAPC > 2.2 V, and at minimum
(–50 dBm) with VAPC < 0.8 V.
A CMOS/TTL-compatible logic input allows the
device to be put into a powerdown mode in which
less than 10 A of supply current is consumed.
BIAS AND CONTROL
VCC
ENABLE
GROUND
φ
EXTERNAL FILTER
OR
DIRECT LO INPUT
APC
RFOUT
π/4
+π/4
Q
I
LOL IN
50
LOH IN
50
Figure 1. Circuit Block Diagram
相關(guān)PDF資料
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1245-TYPE Uncooled Laser Transmitter
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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1244 BK001 功能描述:多芯電纜 1000’ 2C 20AWG UNSHL RoHS:否 制造商:Alpha Wire 導(dǎo)體數(shù)量:3 線規(guī) - 美國線規(guī)(AWG):16 絞合:19 x 29 屏蔽:Shielded 長度:100 ft 電壓額定值:600 V 外殼材料:Polytetrafluoroethylene (PTFE) 絕緣材料:Polytetrafluoroethylene (PTFE) 類型:Communication and Control
1244 BK002 制造商:Belden Inc 功能描述:UNSHLD MULTICOND CABLE 2COND 20AWG 500FT, Reel Length (Imperial):500ft, Reel Len
1244 BK005 功能描述:多芯電纜 2C 20AWG UNSHLD/CBL 100’ SPOOL BLACK RoHS:否 制造商:Alpha Wire 導(dǎo)體數(shù)量:3 線規(guī) - 美國線規(guī)(AWG):16 絞合:19 x 29 屏蔽:Shielded 長度:100 ft 電壓額定值:600 V 外殼材料:Polytetrafluoroethylene (PTFE) 絕緣材料:Polytetrafluoroethylene (PTFE) 類型:Communication and Control
12440 制造商:SUNNEX 功能描述:INSPECTION LIGHT ARM 700MM
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