RF5163_1 Datasheet, PDF (7/14 Pages) RF Micro Devices – 3V-5V, 2.5GHZ LINEAR POWER AMPLIFIER

RF5163
On the RF5163PCBA-WD Evaluation Board schematic, reference designator U1 identifies the RF2373 and reference designa-
tor U2 identifies the RF5163. V_CC (nominal+5.0V_DC) is supplied to both U1 (RF2373) and U2 (RF5163) simultaneously through
P2, two-pin header connector. V_CC is applied to the RF2373 through RF2373 pin 4 (RF OUT). Inductor L4 is positioned to isolate
the power supply line from C7 (RF2373 output tuning capacitor).
R3 on RF2373 pin 3 sets the bias current for RF2373 V_BIAS voltage. As employed within the RF5163PCBA-WD Evaluation
Board, the RF2373 is biased for V_BIAS voltage of +3.0V_DC. RF2373 bias voltage is supplied through P3, two-pin header connec-
tor.
Critical RF5163 input and output tuning components are L2, C11, C13, C16, and C17. The resistor values for R7 and R8 have
changed from the original values in the RF5163 evaluation board schematic. Critical RF2373 input and output tuning compo-
nents are C6, C7 and L4. In these cases, high-Q capacitors suitable for RF applications are used on the RF5163PCBA-WD Eval-
uation Board (bill of material (BOM) is available upon request). 50Ω transmission line segments are employed at both the
input and output of the RF2373. It is strongly recommended that the construction of these transmission line segments be fol-
lowed as closely as possible to yield best gain, gain flatness, and linear amplifier driver performance.
The RF5163PCBA-WD Evaluation Board includes two (2) locations where separate and independent 3dB loss pads may be
populated. These two (2) 3dB loss pads are provided to reduce the overall gain of the RF2373+RF5163 amplifier combination
(which can achieve 40dB gain if not reduced through the use of the available 3dB loss pads). If no gain reduction is desired
simply place resistors R11 and R2 as zero (0) resistor values. If only a single 3dB loss pad is desired for circuit operation it is
recommended to use the R9, R10, R11 3dB loss pad positioned in series with and before RF2373 pin 1 (RF IN). Place resistor
R2 as a zero (0) value resistor.
The RF5163PCBA-WD Evaluation Board has been characterized with a V_CC voltage of +5.0V_DC, RF5163 V_REG1 and V_REG2 volt-
age of +3.0V_DC, and RF2373 bias (V_BIAS or V_PD) voltage of +3.0V_DC. These are ideal operating conditions to achieve the best
combination of gain and ultra linear transmitter performance at an RF P_OUT=+26dBm. However, the RF5163PCBA-WD Evalua-
tion Board will operate from a wide range of V_CC and control voltages. If a different set of V_CC and/or control voltages is desired,
contact RFMD Sales or Applications Engineering for additional data and guidance.
Rev A12 DS061114
7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical
support, contact RFMD at ([phone] or [e-mail].
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