آر اف (فرکانس رادیویی) و بی‌سیم مدولاتور آر اف

Product Attributes

Introduction

The LT5568 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, WCDMA, and other systems. It may also be configured as an image reject upconverting 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 0.5. 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

• Frequency Range: 700MHz to 1050MHz
• High OIP3: +22.90dBm at 850MHz
• Low Output Noise Floor at 5MHz Offset: No RF: –160.3dBm/Hz, P0UT = 40dBm: –154dBm/Hz
• 3 - Ch CDMA2000 ACPR: –71.4dBc at 850MHz
• 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: –43dBm at 850MHz
• High Image Rejection: –46dBc at 850MHz
• 16 - Lead 4mm × 4mm QFN Package

Applications

• Infrastructure Tx for Cellular Bands
• Image Reject Up - Converters for Cellular Bands
• Low - Noise Variable Phase - Shifter for 700MHz to 1050MHz Local Oscillator Signals
• RFID Reader