XP1050-QJ_15 Datasheet, PDF (4/8 Pages) M/A-COM Technology Solutions, Inc. – Lead-Free 6 mm 24-lead QFN Package

XP1050-QJ
2.5 W Power Amplifier
7.1 - 8.5 GHz
Rev. V1
App Note [1] Biasing - As shown in the Pin Designations table, the device is operated by biasing Vd1,2 at 7.0V.
The nominal drain currents are Id1=450 mA and Id2=900 mA. This ratio of 1:2 between the first and second
stage drain currents should be maintained for best linearity. The typical gate voltages needed are -0.9V. The
negative gate voltage must be applied prior to applying the positive drain voltage.
The XP1050-QJ is recommended for linear applications only. Active bias is recommended to keep the currents
known and constant, and to maintain the best performance over temperature. Depending on the supply voltage
available and the power dissipation constraints, the bias circuit may be a single transistor or a low-power
operational amplifier, with a low value resistor in series with the drain supply used to sense the current.
App Note [2] PWB Layout Considerations - It is recommended to provide 1000 pF decoupling capacitors as
close as possible to the pins of the device, with additional larger decoupling capacitors further away. For
example, in the Recommended Layout, there are 1000 pF 0402 capacitors placed very near the device pins,
and 1uF 0805 capacitors placed further away (the gate line shown without a 1uF capacitor (pin 6) would have
this capacitor further away on the other side of the screw).
Thermal management of the device is essential. It is recommended that measures such as copper-filled vias
under the package, and post/screws for top to bottom heat transfer are used (see Recommended Layout shown
below). Adequate heat-sinking under the PWB is necessary in maintaining the package base at a safe operating
temperature.
App Note [3] Power Detector - As shown in the schematic at right, the power detector is implemented by
providing +5V bias and measuring the difference in output voltage with standard op-amp in a differential mode
configuration.
Application Schematic
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