RF5652 Datasheet, PDF (5/21 Pages) RF Micro Devices – 5.0V, 2.4GHz TO 2.7GHz HIGH POWER AMPLIFIER

RF5652
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
should present an RF short to the FEM by using bypass capacitors on the V_CC traces. To simplify bias conditions, the RF5652
requires a single positive supply voltage (V_CC), a positive current control bias (V_REG) supply and a high impedance enable pin
(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-
tions. The V_REG pin requires a regulated supply at 2.85V to maintain nominal bias current.
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.
• Bias V_CC to 5.0V first with V_REG=0.0V. If available, enable the current limiting function of the power supply to 2000 mA.
• Turn on V_REG to 2.85V (typ.).
• On V_REG (of Eval board), regulated supply is recommended. Be extremely careful not to exceed 3.0V on the V_REG pin or
the part may exceed device current limits.
• Turn on Pdown to 2.85V (typ.). Pdown Pin can be tied to V_REG supply.
• The above steps apply to WIMAX Transmit test.
NOTE: It is important to adjust the V_CC voltage source so that +5V is measured at the board; and the +2.85V of V_REG is mea-
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.
• To turn off PA, turn off RF power of signal generator; then Pdown, V_REG and V_CC.
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.
DS120125
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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