Preliminary Technical Data
RF/IF Vector Multiplier
ADL5390
FEATURES
Matched Pair of Multiplying VGAs
Broad Frequency Range 10 MHz – 2.7 GHz
Continuous Magnitude Control of 5 to –30 dB
Output Third Order Intercept +25 dBm
Output 1 dB Compression Point +13 dBm
Output Noise Floor –150 dBm/Hz
Adjustable Modulation Bandwidth up to 230 MHz
Fast Output Power Disable
Single Supply Voltage 4.75 – 5.25 V
FUNCTIONAL BLOCK DIAGRAM
APPLICATIONS
PA Linearization & Predistortion
Amplitude and Phase Modulation
Variable Matched Attenuator and/or Phase Shifter
Cellular Base Stations
Radio Links
Fixed Wireless Access
Broadband/CATV
RF/IF Analog Multiplexer
Figure 1. ADL5390 Functional Block Diagram
GENERAL DESCRIPTION
The ADL5390 Vector Multiplier consists of a matched pair of
broadband variable gain amplifiers whose outputs are summed.
The separate gain controls for each amplifier are linear-inmagnitude. If the two input signals are in quadrature, the vector
multiplier can be configured as a polar vector modulator or as a
variable attenuator/phase shifter by using the gain control pins as
Cartesian variables . In this case, the output amplitude can be
controlled from a maximum of +5 dB to less than –30 dB and the
phase can be shifted continuously over the entire 360 degree range.
Since the signal paths are linear, the original modulation on the
inputs is preserved. If the two signals are independent, then the
vector multiplier can function as a 2:1 multiplexer or provide
fading from one channel to another.
The gain control inputs are DC-coupled with a +/-500 mV
differential full-scale range centered about a 500 mV common
mode. The maximum modulation bandwidth is 230 MHz, which
can be reduced by adding external capacitors to limit the noise
bandwidth on the control lines.
The ADL5390 operates over a wide frequency range from 10 MHz
to 2700 MHz. For a maximum gain setting on one channel at 140
MHz, the ADL5390 delivers a P1dB of 13 dBm, an OIP3 of 25
dBm and an output noise floor of –150 dBm/Hz The gain and
phase matching between the two VGAs is better than 0.5dB and 1
degree, respectively, over most of the operating range.
The ADL5390 is fabricated on Analog Devices’ proprietary, high
performance 25 GHz SOI complementary bipolar IC process. It is
available in a 24-pin Pb-free CSP package and operates over-a -40
to +85 °C temperature range. Evaluation boards are available.
Both the inputs and outputs can be used differentially or singleended and must be AC-coupled. The impedance on each input is
200 ohms to ground and the differential output impedance is
nominally 50 ohms over the operating frequency range. The DSOP
pin allows the output stage to be disabled quickly in order to
protect subsequent stages from over-drive. The ADL5390 operates
off supply voltages from 4.75 to 5.25 V while consuming 130 mA.
REV. PrF 5/31/04
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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
www.analog.com
Tel: 781.329.4700
Fax: 781.326.8703
© 2004 Analog Devices, Inc. All rights reserved.
