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LTC1758 Datasheet

  • LTC1758

  • 40MHz to 900MHz Quadrature Demodulator

  • 210.76KB

  • 12頁

  • LINER

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LT5517
40MHz to 900MHz
Quadrature Demodulator
FEATURES
s
s
s
s
s
s
s
s
s
s
s
DESCRIPTIO
RF Input Frequency Range: 40MHz to 900MHz
High IIP3: 21dBm at 800MHz
High IIP2: 58dBm at 800MHz
I/Q Gain Mismatch: 0.3dB Max
I/Q Phase Mismatch: 0.7擄
Noise Figure: 12.4dB at 800MHz
Conversion Gain: 3.3dB at 800MHz
Baseband Bandwidth: 130MHz
Single Ended, 50鈩?Matched 2XLO Input
Shutdown Mode
16-Lead QFN (4mm
脳
4mm) Package
with Exposed Pad
The LT
廬
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擄 apart. The LT5517 also provides excellent 50鈩?/div>
impedance matching at the 2XLO port across its entire
frequency range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
s
s
s
Wireless Infrastructure
High Linearity Direct Conversion I/Q Receiver
High Linearity I/Q Demodulator
TYPICAL APPLICATIO
BPF
LNA
BPF
5V
RF
+
V
CC
LT5517
I
OUT+
I
OUT鈥?/div>
LPF
VGA
RF
鈥?/div>
0擄
20
0
P
OUT
, IM3, IM2 (dBm/TONE)
DSP
Q
OUT+
梅2
90擄
ENABLE
EN
Q
OUT鈥?/div>
5517 F01
LPF
VGA
2xLO
INPUT
2xLO
Figure 1. High Signal-Level I/Q Demodulator for 450MHz Infrastructure Receiver
U
I/Q Output Power, IM3, IM2
vs RF Input Power
P
OUT
鈥?0
T
A
= 25擄C
P
2XLO
= 鈥?0dBm
鈥?0 f
2XLO
= 1602MHz
f
RF1
= 799.9MHz
f
RF2
= 800.1MHz
鈥?0
鈥?0
鈥?00
鈥?8
IM3
IM2
鈥?4
鈥?0
鈥?
鈥?
RF INPUT POWER (dBm)
2
5517 F01b
U
U
5517f
1

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