RF5355 Datasheet, PDF (8/11 Pages) RF Micro Devices – 3.3V, 5GHz LINEAR POWER AMPLIFIER

RF5355
Theory of Operation
The RF5355 is a three-stage device with a minimum gain of 28dB in the 4.9GHz to 5.850GHz ISM band. The RF5355 is
designed primarily for IEEE802.11a, IEEE802.11n, and IEEE802.16e in the 4.9GHz to 5.850GHz band where the available
supply voltage and current are limited. This amplifier will operate to (and below) the lowest expected voltage made available by
a typical PCMCIA slot in a laptop PC, and will maintain required linearity at decreased supply voltages.
The RF5355 requires only a single positive supply of 3.3V nominal (or greater) to operate to full specifications. Power control is
provided through one bias pin, V_REG. The three bias voltages for the three stages are connected together on the die and only
one bias control voltage is needed (V_REG). There is no external matching required on the input and output of the part, thus
allowing a minimal bill of material (BOM) parts count in end applications. Both the input and the output of the device are DC-
N _blocked.
For best results, the PA circuit layout from the evaluation board should be copied as closely as possible, particularly the ground
IG ^{layout and ground vias. Other configurations may also work, but the design process is much easier and quicker if the layout is}
copied from the RF5355 evaluation board. Gerber files of our designs are available on request. The RF5355 is not a difficult
S ^{part to implement, but care in circuit layout and component selection is always advisable when designing circuits to operate at}
5 GHz.
E _{The RF5355 has primarily been characterized with a voltage on VREG of 2.85VDC. However, the RF5355 will operate from a}
D ^{wide range of control voltages. If you prefer to use a control voltage that is significantly different than 2.85VDC, contact RFMD}
Sales or Applications Engineering for additional data and guidance.
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NOT ^FOR
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