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GENERAL DESCRIPTION

The AD8340 vector modulator performs arbitrary amplitude and phase modulation of an RF signal. Because the RF signal path is linear, the original modulation is preserved. This part can be used as a general-purpose RF modulator, a variable attenuator/phase shifter, or a remodulator. The amplitude can be controlled from a maximum of ?2 dB to less than ?32 dB, and the phase can be shifted continuously over the entire 360° range. For maximum gain, the AD8340 delivers an OP1dB of 11 dBm, an OIP3 of 24 dBm, and an output noise floor of ?149 dBm/Hz, independent of phase. It operates over a frequency range of 700 MHz to 1.0 GHz.

FEATURES

Cartesian amplitude and phase modulation

700 MHz to 1.0 GHz frequency range

Continuous magnitude control of ?2 dB to ?32 dB

Continuous phase control of 0° to 360°

Output third-order intercept 24 dBm

Output 1 dB compression point 11 dBm

Output noise floor ?149 dBm/Hz at full gain

Adjustable modulation bandwidth up to 230 MHz

Fast output power disable

4.75 V to 5.25 V single-supply voltage

APPLICATIONS

RF PA linearization/RF predistortion

Amplitude and phase modulation

Variable attenuators and phase shifters

CDMA2000, GSM/EDGE linear power amplifiers

Smart antennas