100 MHz–2.7 GHz
RF Gain Block
a
AD8353
FEATURES
FUNCTIONAL BLOCK DIAGRAM
Fixed Gain of 20 dB
Operational Frequency of 100 MHz to 2.7 GHz
Linear Output Power Up to 9 dBm
Input/Output Internally Matched to 50 ⍀
Temperature and Power Supply Stable
Noise Figure 5.3 dB
VPOS
VOUT
BIAS AND VREF
INPT
Power Supply 3 V or 5 V
COM1
COM2
AD8353
APPLICATIONS
VCO Buffers
General Tx/Rx Amplification
Power Amplifier Predriver
Low Power Antenna Driver
PRODUCT DESCRIPTION
The noise figure is 5.3 dB at 900 MHz. The reverse isolation
(S12) is –36 dB at 900 MHz and –30 dB at 2.7 GHz.
The AD8353 is a broadband, fixed-gain linear amplifier that
operates at frequencies from 100 MHz up to 2.7 GHz. It is
intended for use in a wide variety of wireless devices including
cellular, broadband, CATV, and LMDS/MMDS applications.
The AD8353 can also operate with a 5 V power supply, in which
case no external inductor is required. Under these conditions,
the AD8353 delivers 8 dBm with 20 dB of gain at 900 MHz.
The dc supply current is 42 mA. At 900 MHz, the OIP3 is
greater than 22 dBm and is 19 dBm at 2.7 GHz. The noise
figure is 5.6 dB at 900 MHz. The reverse isolation (S12) is –35 dB.
By taking advantage of Analog Devices’ high-performance
complementary Si bipolar process, these gain blocks provide
excellent stability over process, temperature, and power supply.
This amplifier is single-ended and internally matched to 50 Ω
with a return loss of greater than 10 dB over the full operating
frequency range.
The AD8353 is fabricated on Analog Devices’ proprietary, high-
performance 25 GHz Si complementary bipolar IC process. The
AD8353 is available in a chip scale package that utilizes an
exposed paddle for excellent thermal impedance and low imped-
ance electrical connection to ground. It operates over a –40°C
to +85°C temperature range.
The AD8353 provides linear output power of 9 dBm with 20 dB
of gain at 900 MHz when biased at 3 V and an external RF
choke is connected between the power supply and the output
pin. The dc supply current is 42 mA. At 900 MHz, the output third
order intercept (OIP3) is greater than 23 dBm, and is 19 dBm
at 2.7 GHz.
An evaluation board is 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, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2002
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