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Evaluating the ADPA1105 46 dBm (40 W), 0.9 GHz to 1.6 GHz, GaN Power Amplifier
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
Rev. 0 | Page 1 of 13
FEATURES
2-Layer Rogers 4350B evaluation board with heat spreader
End launch SMA jack RF connectors
Through calibration path
Drain or gate pulsing capability
EVALUATION KIT CONTENTS
ADPA1105-EVALZ evaluation board
50 V drain pulser board
EQUIPMENT NEEDED
Pulse generator
Oscilloscope
50 V, 2 A power supply
−4 V power supply
Tektronix TCPA312A current probe
Tektronix TCPA300 current probe amplifier
RF signal generator
Directional coupler
RF power sensor
RF power meter
RF attenuator
DOCUMENTS NEEDED
ADPA1105 data sheet
GENERAL DESCRIPTION
The ADPA1105-EVALZ consists of a 2-layer printed circuit
board (PCB) fabricated from a 10 mil thick, Rogers 4350B
copper clad mounted to an aluminum heat spreader. The heat
spreader assists in providing thermal relief to the device as well
as mechanical support to the PCB. Mounting holes on the heat
spreader allow the spreader to be attached to a heat sink.
Alternatively, the spreader can be clamped to a hot and cold
plate. The RFIN and RFOUT ports on the ADPA1105-EVALZ
are populated by Subminiature Version A (SMA) female
coaxial connectors, and the respective RF traces have a 50 Ω
characteristic impedance. The ADPA1105-EVALZ is populated
with components suitable for use over the entire operating
temperature range of the device. To calibrate board trace losses,
a through calibration path is provided between the J6 and J5
connectors. J6 and J5 must be populated with SMA RF
connectors to use the through calibration path.
Ground, power, gate control, and the detector output voltage
are provided through two 4-pin headers (P1 and P2) and two
24-pin headers (P3 and P4) on the ADPA1105-EVALZ. The
pinouts for these four headers are shown in Table 1.
RF traces on the ADPA1105-EVALZ are 50 Ω, grounded, coplanar
waveguide. The package ground leads and the exposed paddle
connect directly to the ground plane. Multiple vias connect the
top and bottom ground planes with particular focus on the area
directly beneath the ground pad to provide adequate electrical
conduction and thermal conduction to the heat spreader.
The ADPA1105-EVALZ ships with a drain pulsing board
(pulser board) that can be plugged into the ADPA1105-EVALZ
headers and configured to control the biasing of the
by providing a negative gate voltage and a control signal that
connects and disconnects the drain voltage to the ADPA1105-
EVALZ. The ADPA1105-EVALZ can also be operated alone in
gate pulsed mode where a negative pulse is applied to the
ADPA1105 V
GG1
and V
GG2
pins.
For full details on the ADPA1105, see the ADPA1105 data
sheet, which must be consulted in conjunction with this user
guide when using the ADPA1105-EVALZ.
