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AD8341 Datasheet

  • AD8341

  • 1.5 GHz to 2.4 GHz RF Vector Modulator

  • 1052.64KB

  • 21页

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1.5 GHz to 2.4 GHz
RF Vector Modulator
AD8341
FEATURES
Cartesian amplitude and phase modulation
1.5 GHz to 2.4 GHz frequency range
Continuous magnitude control of 鈭?.5 dB to 鈭?4.5 dB
Continuous phase control of 0掳 to 360掳
Output third-order intercept 17.5 dBm
Output 1 dB compression point 8.5 dBm
Output noise floor 鈭?50.5 dBm/Hz @ full gain
Adjustable modulation bandwidth up to 230 MHz
Fast output power disable
4.75 V to 5.25 V single-supply voltage
FUNCTIONAL BLOCK DIAGRAM
VPRF
QBBP QBBM
VPS2
90掳
RFIP
RFIM
0掳
04700-001
RFOP
RFOM
CMOP
IBBP IBBM
DSOP
Figure 1.
APPLICATIONS
RF PA linearization/RF predistortion
Amplitude and phase modulation
Variable attenuators and phase shifters
CDMA2000, WCDMA, GSM/EDGE linear power amplifiers
Smart antennas
GENERAL DESCRIPTION
The AD8341 vector modulator performs arbitrary amplitude
and phase modulation of an RF signal. Since the RF signal path
is linear, the original modulation is preserved. This part can be
used as a general-purpose RF modulator, a variable attenu-
ator/phase shifter, or a remodulator. The amplitude can be
controlled from a maximum of 鈭?.5 dB to less than 鈭?4.5 dB,
and the phase can be shifted continuously over the entire 360掳
range. For maximum gain, the AD8341 delivers an OP1dB of
8.5 dBm, an OIP3 of 17.5 dBm, and an output noise floor of
鈭?50.5 dBm/Hz, independent of phase. It operates over a
frequency range of 1.5 GHz to 2.4 GHz.
The baseband inputs in Cartesian I and Q format control the
amplitude and phase modulation imposed on the RF input
signal. Both I and Q inputs are dc-coupled with a 卤500 mV
differential full-scale range. The maximum modulation band-
width is 230 MHz, which can be reduced by adding external
capacitors to limit the noise bandwidth on the control lines.
Both the RF inputs and outputs can be used differentially or
single-ended and must be ac-coupled. The RF input and output
impedances are nominally 50 鈩?over the operating frequency
range. The DSOP pin allows the output stage to be disabled
quickly in order to protect subsequent stages from overdrive.
The AD8341 operates off supply voltages from 4.75 V to 5.25 V
while consuming approximately 125 mA.
The AD8341 is fabricated on Analog Devices鈥?proprietary, high
performance 25 GHz SOI complementary bipolar IC process. It
is available in a 24-lead, Pb-free LFCSP package and operates
over a 鈭?0掳C to +85掳C temperature range. Evaluation boards
are available.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
漏 2004 Analog Devices, Inc. All rights reserved.

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