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One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Evaluating the ADPA1105 46 dBm (40 W), 0.9 GHz to 1.6 GHz, GaN Power Amplifier
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.
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS.
ADPA1105-EVALZ
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
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.
Rev. 0 | Page 1 of 13
User Guide
and V
pins.
GG2
UG-1674
ADPA1105
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Table of Contents
Related Manuals for Analog Devices ADPA1105-EVALZ
Summary of Contents for Analog Devices ADPA1105-EVALZ
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Page 1: Features
50 V, 2 A power supply pinouts for these four headers are shown in Table 1. −4 V power supply RF traces on the ADPA1105-EVALZ are 50 Ω, grounded, coplanar Tektronix TCPA312A current probe waveguide. The package ground leads and the exposed paddle Tektronix TCPA300 current probe amplifier connect directly to the ground plane. -
Page 2: Table Of Contents
Bill of Materials ................13 Insertion Loss of the Through Calibration Path ......5 Operating the ADPA1105-EVALZ with a Pulsed Gate Voltage 6 Setup ....................6 REVISION HISTORY 10/2020—Revision 0: Initial Version Rev. 0 | Page 2 of 13... -
Page 3: Evaluation Board Photographs
ADPA1105-EVALZ User Guide UG-1674 EVALUATION BOARD PHOTOGRAPHS Figure 1. ADPA1105-EVALZ Evaluation Board, Primary Side Figure 2. ADPA1105-EVALZ Evaluation Board, Secondary Side Rev. 0 | Page 3 of 13... -
Page 4: Header Pinout
ADPA1105-EVALZ User Guide HEADER PINOUT The schematic for the ADPA1105-EVALZ is shown in Figure 6. The ADPA1105-EVALZ contains four headers, P1, P2, P3, and P4. Table 1 describes the pinout of these headers. Table 1. P1 to P4 Header Connections on the ADPA1105-EVALZ... -
Page 5: Insertion Loss Of The Through Calibration Path
ADPA1105-EVALZ User Guide UG-1674 INSERTION LOSS OF THE THROUGH CALIBRATION PATH To calibrate board trace losses, a through calibration path is Table 2. Insertion Loss of Through Calibration Path provided between the J6 and J5 connectors. J6 and J5 must be... -
Page 6: Operating The Adpa1105-Evalz With A Pulsed Gate Voltage
0 V. All power supply, ground, and control signals are applied to the P3 and P4 headers of the ADPA1105-EVALZ. For this mode of operation, pulse the gate voltage between −4 V (off) and approximately −2.3 V (on) to set the quiescent current ) to approximately 400 mA. -
Page 7: Operating The Adpa1105-Evalz With The Drain Bias Pulser Board
UG-1674 OPERATING THE ADPA1105-EVALZ WITH THE DRAIN BIAS PULSER BOARD The ADPA1105-EVALZ ships with a drain bias pulser board. A Table 3. Pulser Board J1, J2, and J3 Header Connections block diagram of the pulser board is shown in Figure 4. The pulser to ADPA1105 board has two primary components. -
Page 8: Setup
Figure 5. Before applying all signals are applied to the pulser board): any bias or signals, plug the pulser board into ADPA1105-EVALZ Set the voltage on Pin 19 and Pin 20 of J1 (PULSE) to 0 V. - Page 9 ADPA1105-EVALZ User Guide UG-1674 VGGx DC SUPPLY DC SUPPLY +50V/2A 0V TO –4V GND PULSE GENERATOR SYNC OUT PULSE OUT VDD AND IDD MONITORING OSCILLOSCOPE CH 1 CH 2 CH 3 TRIGGER TEKTRONIX TCPA300 TEKTRONIX TCPA312A AMPLIFIER CURRENT PROBE OUTPUT INPUT...
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Page 10: Making Average To Pulsed Approximations
UG-1674 ADPA1105-EVALZ User Guide MAKING AVERAGE TO PULSED APPROXIMATIONS Instruments that can be triggered are required to measure the RF To ensure that partial periods do not contribute significant power, drain current, and power added efficiency (PAE) accurately errors to the measurements, perform averaging over a large under pulsed operation. -
Page 11: Evaluation Board Schematic And Artwork
2. RF TRACE – COPLANAR WITH GROUND, 16mil WIDTH AND 13mil GAP EACH SIDE 3. 1/2oz. COPPER TRACES 4. 40mil WIDE VD TRACE FOR HIGH CURRENT CAPABILITY 5. USE HMC8500 AS A TEMPLATE 6. SOLDER MASK – TOP SIDE ONLY Figure 6. ADPA1105-EVALZ Evaluation Board Schematic Rev. 0 | Page 11 of 13... - Page 12 UG-1674 ADPA1105-EVALZ User Guide Figure 7. ADPA1105-EVALZ Assembly Drawing (J6 and J5 Not Installed) Rev. 0 | Page 12 of 13...
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Page 13: Ordering Information
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement.
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