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( File format: PDF, 322696 )
620MHz - 1100MHz High Linearity Direct Quadrature Modulator
Linear Technology Inc.

Description
The LT5571 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 RFID, GSM, EDGE, CDMA, CDMA2000, and other systems. It may also be confi gured as an image reject upconverting mixer by applying 90∼ phase-shifted signals to the I and Q inputs. The high impedance 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 50次 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 at 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.
Features
Direct Conversion from Baseband to RF High Output: 每4.2dB Conversion Gain High OIP3: 21.7dBm at 900MHz Low Output Noise Floor at 20MHz Offset:No RF: 每159dBm/HzPOUT = 4dBm: 每153.3dBm/Hz Low Carrier Leakage: 每42dBm at 900MHz High Image Rejection: 每53dBc at 900MHz 3-Ch CDMA2000 ACPR: 每70.4dBc at 900MHz Integrated LO Buffer and LO Quadrature Phase Generator 50次 AC-Coupled Single-Ended LO and RF Ports High Impedance DC Interface to Baseband Input with 0.5V Common Mode Voltage 16-Lead QFN 4mm ℅ 4mm Package




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