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參數(shù)資料
| 型號： | LTC5507 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 40MHz to 900MHz Quadrature Demodulator |
| 中文描述： | 高達40MHz至900MHz正交解調(diào)器 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 208K |
| 代理商： | LTC5507 |
LT5517
1
5517f
BPF
5V
V
CC
BPF
RF
+
RF
–
LPF
LT5517
I
OUT+
I
OUT–
0
°
2xLO
EN
ENABLE
2xLO
INPUT
LPF
DSP
Q
OUT+
Q
OUT–
90
°
÷
2
5517 F01
LNA
VGA
VGA
I
Wireless Infrastructure
I
High Linearity Direct Conversion I/Q Receiver
I
High Linearity I/Q Demodulator
, LTC and LT are registered trademarks of Linear Technology Corporation.
I
RF Input Frequency Range: 40MHz to 900MHz
I
High IIP3: 21dBm at 800MHz
I
High IIP2: 58dBm at 800MHz
I
I/Q Gain Mismatch: 0.3dB Max
I
I/Q Phase Mismatch: 0.7
°
I
Noise Figure: 12.4dB at 800MHz
I
Conversion Gain: 3.3dB at 800MHz
I
Baseband Bandwidth: 130MHz
I
Single Ended, 50
Matched 2XLO Input
I
Shutdown Mode
I
16-Lead QFN (4mm
×
4mm) Package
with Exposed Pad
40MHz to 900MHz
Quadrature Demodulator
Figure 1. High Signal-Level I/Q Demodulator for 450MHz Infrastructure Receiver
I/Q Output Power, IM3, IM2
vs RF Input Power
The LT
5517 is a 40MHz to 900MHz quadrature demodu-
lator optimized for high linearity receiver applications
where high dynamic range is important. It is suitable for
communications receivers where an RF or IF signal is
directly converted into I and Q baseband signals with a
bandwidth up to 130MHz. The LT5517 incorporates bal-
anced I and Q mixers, LO buffer amplifiers and a precision,
broadband quadrature generator derived from an on-chip
divide-by-two circuit.
The superior linearity and low noise performance of the
LT5517 is achieved across its full frequency range. A well-
balanced divide-by-two circuit generates precision quadra-
ture LO carriers to drive the I mixer and the Q mixer.
Consequently, the outputs of the I-channel and the
Q-channel are well matched in amplitude, and their phases
are 90
°
apart. The LT5517 also provides excellent 50
impedance matching at the 2XLO port across its entire
frequency range.
RF INPUT POWER (dBm)
–18
–100
P
O
,
–80
–60
–40
–20
0
20
P
OUT
IM3
IM2
–14
–10
–6
–2
5517 F01b
2
T
A
= 25
°
C
P
2XLO
= –10dBm
f
2XLO
= 1602MHz
f
RF1
= 799.9MHz
f
RF2
= 800.1MHz
FEATURES
DESCRIPTIOU
APPLICATIU
TYPICAL APPLICATIO
U
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