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RF5652

DS120125

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or sales-support@rfmd.com.

Theory of Operation and Applications

The RF5652 is a High Power Amplifier (PA) for high performance WiFi applications in the 2.4GHz to 2.5GHz ISM band, to

address IEEE 802.11b/g/n customer premises equipment (CPE) application, and WiMAX 2.5GHz to 2.7GHz CPE application.

The RF5652 has an integrated three stage linear Power Amplifier to provide 30dBm (1 Watt) linear power at PA output The

device is manufactured using InGaP HBT processes 1n a 5mm x 5mm x 0.85mm QFN package. To reduce the design and opti-

mization process on the customer application, the evaluation board layout should be copied as close as possible, in particular

the ground and via configurations. Gerber files of RFMD PCB designs can be provided upon request. The supply voltage lines

(PENABLE). The built-in Power Detector of the RF5652 can be used as power monitor in the system.

RF5652 PA Operation

The RF5652 has a typical gain of 34dB from 2.4GHz to 2.5GHz, and delivers > 29.5dBm typical output power in 11n HT20

MCS7 and >30dBm typical in 11g 54Mbps with a Dynamic EVM < 3%. For WiMAX application, RF5652 delivers 30dBm typical

output power in WiMAX 10MHz BW with EVM < 2.5%. The RF5652 requires a single positive of 5.0V to operate at full specifica-

RF5652 Biasing Instructions to the Eval board:

• 802.11b/g/n Transmit:

• Connect the PA to a signal generator at the input and a spectrum analyzer at the output. Set the Pin at signal genera-

tor is at -20dBm.

the part may exceed device current limits.

• The above steps apply to WIMAX Transmit test.

sured at the board. The high collector currents will drop the collector voltage significantly if long leads are used. Adjust the bias

voltage to compensate.

• Turn on RF of signal generator and gradually increase power level to the rated power.

CAUTION: If the input signal exceeds the maximum rated power, the RF5652 Evaluation Board can be permanently damaged.

General Layout Guidelines and considerations:

For best performance the following layout guidelines and considerations must be followed regardless of final use or configura-

tion:

1. The ground pad of the RF5652 has special electrical and thermal grounding requirements. This pad is the main RF ground

and main thermal conduit path for heat dissipation. The GND pad and vias pattern and size used on the RFMD evaluation

board should be replicated. The RFMD layout files in Gerber format can be provided upon request. Ground paths (under

device) should be made as short as possible.

2. The RF lines should be well separated with solid ground in between the traces to eliminate any possible RF leakages or

cross-talking.