GENERAL DESCRIPTION

The AD8346 is a silicon RFIC I/Q modulator for use from 0.8 GHz to 2.5 GHz. Its excellent phase accuracy and amplitude balance allow high performance direct modulation to RF. The differential LO input is applied to a polyphase network phase splitter that provides accurate phase quadrature from 0.8 GHz to 2.5 GHz. Buffer amplifiers are inserted between two sections of the phase splitter to improve the signal-to-noise ratio. The I and Q outputs of the phase splitter drive the LO inputs of two Gilbert-cell mixers. Two differential V-to-I converters connected to the baseband inputs provide the baseband modulation signals for the mixers. The outputs of the two mixers are summed together at an amplifier which is designed to drive a 50 Ω load.

FEATURES

High accuracy

1 degree rms quadrature error @ 1.9 GHz

0.2 dB I/Q amplitude balance @ 1.9 GHz

Broad frequency range: 0.8 GHz to 2.5 GHz

Sideband suppression: ?46 dBc @ 0.8 GHz

Sideband suppression: ?36 dBc @ 1.9 GHz

Modulation bandwidth: dc to 70 MHz

0 dBm output compression level @ 0.8 GHz

Noise floor: ?147 dBm/Hz

Single 2.7 V to 5.5 V supply

Quiescent operating current: 45 mA

Standby current: 1 μA

16-lead TSSOP

APPLICATIONS

Digital and spread spectrum communication systems

Cellular/PCS/ISM transceivers

Wireless LAN/wireless local loop

QPSK/GMSK/QAM modulators

Single-sideband (SSB) modulators

Frequency synthesizers

Image reject mixer

AD8346屬于RF/IF，射頻/中頻和 RFID > RF 調(diào)制器。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD8346RF 調(diào)制器射頻 (RF) 調(diào)制器產(chǎn)品用于通過更改載波的幅度、相位和/或頻率，將信息編碼到正弦載波信號(hào)上。執(zhí)行反向解調(diào)操作的接收設(shè)備會(huì)選擇性地以所需載波頻率接收傳入信號(hào)，從而將載波屬性的變化轉(zhuǎn)換回原始形式。這樣的配置允許使用通信通道來同時(shí)傳輸多條消息，而彼此之間沒有干擾。