RF5622_11 Datasheet, PDF (5/9 Pages) RF Micro Devices – LINEAR POWER AMPLIFIER

RF5622
Theory of Operation and Application Information
The RF5622 is a two-stage power amplifier (PA) with a typical gain of 30dB in the 2.4GHz to 2.5GHz ISM band. The RF5622
has integrated input and interstage matching components thus allowing a minimal bill of material (BOM) part count in end
applications. The RF5622 is designed primarily for IEEE802.11b/g/n WiFi applications 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 device is provided in a
2mmx2mmx0.45mm, 8-pin, QFN with backside ground.
The RF5622 requires only a single positive supply of 3.3V nominal to operate to full specifications. Power control is provided
through one bias voltage pin (V_REG). The input DC blocking cap is provided internally, the output of the PA is not internally DC
blocked. The evaluation board circuit (available from RF Micro Devices, Inc. (RFMD)) is optimized for 3.3V_DC applications. For
best performance, it is important to duplicate (as closely as possible) the layout of the evaluation board. The RF5622 has pri-
marily been characterized with a voltage on V_REG of 2.8V_DC. If you prefer to use a bias voltage that is significantly different than
2.8V_DC, or a different frequency than the recommended frequency range, contact RFMD Sales or Applications Engineering for
additional data and guidance.
For best results, the PA circuit layout from the evaluation board should be copied as closely as possible, particularly the ground
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 RF5622 evaluation board. Gerber files of RFMD PCBA designs can be provided on request. The RF5622 is a
very easy part to implement, but care in circuit layout and component selection is always advisable when designing circuits to
operate at 2.5GHz. The RF5622 evaluation board layout and schematic are available using 0201 (US) size components which
will help shrink the overall size of the total area of the PA and components of the intended design. If you prefer to use a supply
or bias voltage that is significantly different than what is specified, or a different frequency than the recommended frequency
range, contact RFMD Sales or Applications Engineering for additional data and guidance.
DS110619
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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