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ADL5570-EVALZ

2.3 GHz to 2.4 GHz WiMAX Power Amplifier

Analog Devices 

FEATURES

Fixed gain of 29 dB

Operation from 2.3 GHz to 2.4 GHz

EVM ≤ 3% at POUT = 25 dBm with 16 QAM OFDMA

Input internally matched to 50 Ω

Power supply: 3.2 V to 4.2 V

Quiescent current

130 mA in high power mode

70 mA in low power mode

Power-added efficiency (PAE): 20%

Multiple operating modes to reduce battery drain

Low power mode: 100 mA

Standby mode: 1mA

Sleep mode: <1 μA

APPLICATIONS

WiMAX/WiBro mobile terminals

GENERAL DESCRIPTION

The ADL5570 is a high linearity 2.3 GHz to 2.4 GHz power

amplifier designed for WiMAX terminals using TDD operation

at a duty cycle of 31%. With a gain of 29 dB and an output

compression point of 31 dBm at 2.35 GHz, it can operate at

an output power level up to 26 dBm while maintaining an EVM

of ≤3% (OFDM 16 or 64 QAM) with a supply voltage of 3.5 V.

PAE is 20% @ POUT = 25 dBm.

The ADL5570 RF input is matched on-chip and provides an

input return loss of less than −10 dB. The open-collector output is

externally matched with strip-line and external shunt capacitance.

2.3 GHz to 2.4 GHz

WiMAX Power Amplifier

ADL5570

FUNCTIONAL BLOCK DIAGRAM

VCC1

VCC2

RFIN

IM1

FIRST

STAGE

IM2

SECOND

STAGE

IM3

THIRD

STAGE

RFOUT

OM

STBY

VREG

MODE

BIAS_1

BIAS_2

Figure 1.

BIAS_3

CFLT

The ADL5570 operates over a supply voltage range from 3.2 V

to 4.2 V with a supply current of 440 mA burst rms when

delivering 25 dBm (3.5 V supply). A low power mode is also

available for operation at power levels of ≤10 dBm with

optimized operating and quiescent currents of 100 mA and

70 mA, respectively. A standby mode is available that reduces

the quiescent current to 1 mA, which is useful when a TDD

terminal is receiving data.

The ADL5570 is fabricated in a GaAs HBT process and is packaged

in a 4 mm × 4 mm, 16-lead, Pb-free RoHS-compliant LFCSP

that uses an exposed paddle for excellent thermal impedance.

It operates from −40°C to +85°C.

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: 781.461.3113

©2007 Analog Devices, Inc. All rights reserved.

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