LT5528EUF Ver la hoja de datos (PDF) - Linear Technology

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LT5528EUF

1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator

Linear Technology 

FEATURES

■ Direct Conversion to 1.5GHz to 2.4GHz

■ High OIP3: 21.8dBm at 2GHz

■ Low Output Noise Floor at 5MHz Offset:

No RF: –159.3dBm/Hz

POUT = 4dBm: –151.8dBm/Hz

■ 4-Ch W-CDMA ACPR: –66dBc at 2.14GHz

■ Integrated LO Buffer and LO Quadrature Phase

Generator

■ 50Ω AC-Coupled Single-Ended LO and RF Ports

■ 50Ω DC Interface to Baseband Inputs

■ Low Carrier Leakage: –42dBm at 2GHz

■ High Image Rejection: 45dB at 2GHz

■ 16-Lead QFN 4mm × 4mm Package

U

APPLICATIO S

■ Infrastructure Tx for DCS, PCS and UMTS Bands

■ Image Reject Up-Converters for PCS and UMTS

Bands

■ Low-Noise Variable Phase-Shifter for 1.5GHz to

2.4GHz Local Oscillator Signals

LT5528

1.5GHz to 2.4GHz

High Linearity Direct

Quadrature Modulator

DESCRIPTIO

The LT®5528 is a direct I/Q modulator designed for high

performance wireless applications, including wireless

infrastructure. It allows direct modulation of an RF signal

using differential baseband I and Q signals. It supports

PHS, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000,

W-CDMA and other systems. It may also be configured

as an image reject up-converting mixer, by applying

90° phase-shifted signals to the I and Q inputs. The I/Q

baseband inputs consist of voltage-to-current converters

that in turn drive double-balanced mixers. The outputs of

these mixers are summed and applied to an on-chip RF

transformer, which converts the differential mixer signals

to a 50Ω single-ended output. The four balanced I and Q

baseband input ports are intended for DC coupling from a

source with a common-mode voltage level of about 0.5V.

The LO path consists of an LO buffer with single-ended

input, and precision quadrature generators that produce

the LO drive for the mixers. The supply voltage range is

4.5V to 5.25V.

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

TYPICAL APPLICATIO

1.5GHz to 2.4GHz Direct Conversion Transmitter Application

with LO Feed-Through and Image Calibration Loop

I-DAC

14

16 V-I

VCC 8, 13

LT5528

5V

RF = 1.5GHz

TO 2.4GHz

W-CDMA ACPR, AltCPR and Noise vs RF Output

Power at 2140MHz for 1, 2 and 4 Channels

–55

–140

DOWNLINK TEST MODEL 64 DPCH

–60

–145

EN

Q-DAC

I-CHANNEL

1

0°

90°

7 Q-CHANNEL

5 V-I

11

PA

4-CH ACPR

–65

2-CH ACPR –150

BALUN

LO FEED-THROUGH CAL OUT

2-CH AltCPR

4-CH AltCPR

IMAGE CAL OUT

–70

1-CH ACPR

–155

1-CH AltCPR

CAL

BASEBAND

DSP

ADC

2, 4, 6, 9, 10, 12, 15, 17

3

VCO/SYNTHESIZER

–75 4-CH NOISE

–160

1-CH NOISE

–80

–165

–42 –38 –34 –30 –26 –22 –18 –14

RF OUTPUT POWER PER CARRIER (dBm)

5528 TA01a

5528 TA01b

5528f

1

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