LT5517 查看數據表（PDF） - Linear Technology

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LT5517

40MHz to 900MHz Quadrature Demodulator

Linear Technology 

FEATURES

s RF Input Frequency Range: 40MHz to 900MHz

s High IIP3: 21dBm at 800MHz

s High IIP2: 58dBm at 800MHz

s I/Q Gain Mismatch: 0.3dB Max

s I/Q Phase Mismatch: 0.7°

s Noise Figure: 12.4dB at 800MHz

s Conversion Gain: 3.3dB at 800MHz

s Baseband Bandwidth: 130MHz

s Single Ended, 50Ω Matched 2XLO Input

s Shutdown Mode

s 16-Lead QFN (4mm × 4mm) Package

with Exposed Pad

U

APPLICATIO S

s Wireless Infrastructure

s High Linearity Direct Conversion I/Q Receiver

s High Linearity I/Q Demodulator

LT5517

40MHz to 900MHz

Quadrature Demodulator

DESCRIPTIO

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 50Ω

impedance matching at the 2XLO port across its entire

frequency range.

, LTC and LT are registered trademarks of Linear Technology Corporation.

TYPICAL APPLICATIO

BPF

BPF

RF+

LNA

RF –

5V

VCC

LT5517

IOUT+ LPF

VGA

IOUT–

0°

DSP

2xLO

INPUT

2xLO

÷2

ENABLE

EN

QOUT+ LPF

VGA

QOUT–

90°

5517 F01

Figure 1. High Signal-Level I/Q Demodulator for 450MHz Infrastructure Receiver

I/Q Output Power, IM3, IM2

vs RF Input Power

20

0

–20 TA = 25°C

P2XLO = –10dBm

–40 f2XLO = 1602MHz

fRF1 = 799.9MHz

fRF2 = 800.1MHz

–60

POUT

IM3

IM2

–80

–100

–18

–14 –10 –6

–2

2

RF INPUT POWER (dBm)

5517 F01b

5517f

1

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