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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

1. High accuracy
2. 1 degree rms quadrature error @ 1.9 GHz
3. 0.2 dB I/Q amplitude balance @ 1.9 GHz
4. Broad frequency range: 0.8 GHz to 2.5 GHz
5. Sideband suppression: −46 dBc @ 0.8 GHz
6. Sideband suppression: −36 dBc @ 1.9 GHz
7. Modulation bandwidth: dc to 70 MHz
8. 0 dBm output compression level @ 0.8 GHz
9. Noise floor: −147 dBm/Hz
10. Single 2.7 V to 5.5 V supply
11. Quiescent operating current: 45 mA
12. Standby current: 1 μA

Applications

1. Digital and spread spectrum communication systems
2. Cellular/PCS/ISM transceivers
3. Wireless LAN/wireless local loop
4. QPSK/GMSK/QAM modulators
5. Single-sideband (SSB) modulators
6. Frequency synthesizers
7. Image reject mixer