Analog Devices EVAL-ADPA1106 User manual

User Guide | EVAL-ADPA1106

UG-2037

Evaluating the ADPA1106 46 dBm (40 W), 2.7 GHz to 3.5 GHz, GaN Power Amplifier

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | 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

►ADPA1106-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

►ADPA1106 data sheet

GENERAL DESCRIPTION

The ADPA1106-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 ADPA1106-EVALZ are populated by Subminiature

Version A (SMA) female coaxial connectors, and the respective

RF traces have a 50 Ω characteristic impedance. The ADPA1106-

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 the two 24-pin headers (P4 and P5) on the

ADPA1106-EVALZ. The pinouts for these two headers are shown in

Table 1.

RF traces on the ADPA1106-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 ADPA1106-EVALZ ships with a drain pulser board that can

be plugged into the ADPA1106-EVALZ headers and configured to

control the biasing of the ADPA1106 by providing a negative gate

voltage and a control signal that connects and disconnects the

drain voltage to the ADPA1106-EVALZ. The ADPA1106-EVALZ can

also operate alone in gate pulsed mode where a negative pulse is

applied to the VGG1 and VGG2 pins of the ADPA1106.

For full details on the ADPA1106, see the ADPA1106 data sheet,

which must be consulted in conjunction with this user guide when

using the ADPA1106-EVALZ.

User Guide EVAL-ADPA1106

TABLE OF CONTENTS

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Features................................................................ 1

Evaluation Kit Contents......................................... 1

Equipment Needed................................................1

Documents Needed...............................................1

General Description...............................................1

Evaluation Board Photographs..............................3

Header Pinout........................................................4

Insertion Loss of the Through Calibration Path..... 5

Operating the ADPA1106-EVALZ with a

Pulsed Gate Voltage............................................6

Setup..................................................................6

Operation ...........................................................6

Operating the ADPA1106-EVALZ with the

Drain Bias Pulser Board...................................... 7

Setup..................................................................8

Operation............................................................9

Making Average to Pulsed Approximations.........10

Evaluation Board Schematic and Artwork........... 11

Ordering Information............................................13

Bill of Materials.................................................13

REVISION HISTORY

4/2022—Revision 0: Initial Version

User Guide EVAL-ADPA1106

EVALUATION BOARD PHOTOGRAPHS

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Figure 1. ADPA1106-EVALZ Evaluation Board, Primary Side Figure 2. ADPA1106-EVALZ Evaluation Board, Secondary Side

User Guide EVAL-ADPA1106

HEADER PINOUT

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The schematic for the ADPA1106-EVALZ is shown in Figure 6.

The ADPA1106-EVALZ contains two headers, P4 and P5. Table 1

describes the pinout of these headers.

Table 1. P4 and P5 Header Connections on the ADPA1106-EVALZ

Header Header Pin Number Header Pin Name

P4 1 to 5, 7, 9, 11 to 17, 19, 21 GND

6, 8 VGG1

10 VGG2

18, 20, 22 Not connected

23 VDET

24 VDET_BIAS

P5 1 VREF

2 VREF_BIAS

3, 5, 7, 9 to 15, 17, 19, 21 to 24 GND

4, 6 VDD2

8 VDD1

16, 18, 20 Not connected

User Guide EVAL-ADPA1106

INSERTION LOSS OF THE THROUGH CALIBRATION PATH

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To calibrate board trace losses, a through calibration path is provid-

ed between the J6 and J5 connectors. J6 and J5 must be populated

with SMA RF connectors to use the through calibration path.

Figure 3 shows the insertion loss, input return loss, and output

return loss of the through calibration path. Table 2 lists the insertion

loss of the through path vs. frequency.

Figure 3. Insertion Loss, Input Return Loss, and Output Return Loss of

Through Calibration Path

Table 2. Insertion Loss of Through Calibration Path

Frequency (GHz) Insertion Loss (dB)

1 −0.24

2 −0.36

3 −0.48

4 −0.45

5 −0.5

6 −0.55

7 −0.61

8 −0.64

9 −0.65

10 −0.65

User Guide EVAL-ADPA1106

OPERATING THE ADPA1106-EVALZ WITH A PULSED GATE VOLTAGE

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To implement gate pulsed operation, apply a negative voltage pulse

to the VGG1 and VGG2 inputs of the ADPA1106 while the voltage

on the VDD1 and VDD2 pins of the ADPA1106 is held constant.

SETUP

All power supply, ground, and control signals are applied to the P4

and P5 headers of the ADPA1106-EVALZ. For this mode of opera-

tion, pulse the gate voltage between −4 V (off) and approximately

−2.3 V (on) to set the quiescent current (IDQ) to approximately

300 mA. The pulse width and duty cycle must be approximately

100 µs and 10%, respectively.

OPERATION

Take the following steps to power up the ADPA1106-EVALZ:

1. Set VDDx (Pin 4, Pin 6, and Pin 8 of P5) to 0 V.

2. Set VGGx (Pin 6, Pin 8, and Pin 10 of P4) to off (VGG1 =

VGG2 = −4 V).

3. Set the supply voltage (VDD) to 50 V.

4. Turn on the gate voltage pulse (VGG1 and VGG2 pulsing

between −4 V and approximately −2.3 V).

5. Fine tune the pulse high voltage to achieve the desired IDQ

(nominally 300 mA) while maintaining the pulse off voltage level

at −4 V.

6. Apply the RF input signal.

Take the following steps to power down the ADPA1106-EVALZ:

1. Turn off the RF signal.

2. Turn off the pulse to VGG1 and VGG2 (VGG1 = VGG2 = −4 V).

3. Set VDD to 0 V.

4. Increase the pulse to VGG1 and VGG2 to 0 V.

User Guide EVAL-ADPA1106

OPERATING THE ADPA1106-EVALZ WITH THE DRAIN BIAS PULSER BOARD

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The ADPA1106-EVALZ ships with a drain bias pulser board. A block

diagram of the pulser board is shown in Figure 4. The pulser board

has two primary components. The BSC340N08NS3 is an 80 V/

23 A, metal-oxide semiconductor field effect transistor (MOSFET)

that switches the drain voltage to the ADPA1106 on and off, and the

LTC7000 is a high-side, negative channel metal-oxide semiconduc-

tor (NMOS), static switch driver that controls the MOSFET.

The pulser board plugs into the P4 and P5 headers of ADPA1106-

EVALZ and can be configured to provide a pulsed drain voltage

and a negative gate control voltage to control the biasing of the

ADPA1106.

Figure 4. Analog Devices, Inc., Pulser Board Schematic

User Guide EVAL-ADPA1106

OPERATING THE ADPA1106-EVALZ WITH THE DRAIN BIAS PULSER BOARD

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SETUP

The connections required to use the ADPA1106-EVALZ with the

drain bias pulser board are shown in Figure 5. Before applying any

bias or signals, plug the pulser board into the ADPA1106-EVALZ

so that the P2 header connector of the pulser board connects to

the P5 header of the ADPA1106-EVALZ, and the P3 header of the

pulser board connects to the P4 header of the ADPA1106-EVALZ.

All external supply voltages and control signals are applied to the

J1 thru J4 BNC connectors of the pulser board, which are listed in

Table 3.

Table 3. Pulser Board J1 to J4, TP1 to TP4, and P2 and P3 Header

Connections to the ADPA1106

Header Header Pin Number Header Pin Name

J1 Not applicable VDD

J2 Not applicable SENSE

J3 Not applicable PULSE

J4 Not applicable VGG

J5 Not applicable PULSED VDD

TP1 Not applicable VDET_BIAS

TP2 Not applicable VDET

TP3 Not applicable VREF

TP4 Not applicable VREF_BIAS

P2 1 VREF

2 VREF_BIAS

3, 5, 7, 9 to 15, 17, 19, 21 to 24 GND

Table 3. Pulser Board J1 to J4, TP1 to TP4, and P2 and P3 Header

Connections to the ADPA1106

Header Header Pin Number Header Pin Name

4, 6, 8 PULSED_VDD

16, 18, 20 VGG

P3 1 to 5, 7, 9, 11 to 17, 19, 21 GND

6, 8, 10 VGG

18, 20, 22 PULSED_VDD

23 VDET

24 VDET_BIAS

The gate control voltage applied to the J4 connector passes directly

through the pulser board and drives the VGG1 and VGG2 pins of

the ADPA1106. Because the VDD and GND lines carry currents up

to 2 A, the use of heavy gauge twister pair wires is recommended

to minimize voltage drops. To observe the pulsed drain voltage

(PULSED_VDD) that drives the VDD1 and VDD2 pins of the AD-

PA1106, connect an oscilloscope to the J5 coaxial connector on the

pulser board.

Connect a digital pulse generator that can generate 0 V to 5 V

pulses with a pulse width of 100 µs and a duty cycle of 10% to the

pulse input, J3.

To observe and measure the drain current and the ADPA1106

RF output power, use a current probe and a pulsed RF power

meter. If these methods are not available, make approximations as

described in the Making Average to Pulsed Approximations section.

Figure 5. Setup Block Diagram

User Guide EVAL-ADPA1106

OPERATING THE ADPA1106-EVALZ WITH THE DRAIN BIAS PULSER BOARD

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OPERATION

Take the following steps to power up (unless otherwise stated, all

signals are applied to the pulser board) the ADPA1106-EVALZ:

1. Set the voltage on J3 (PULSE) to 0 V.

2. Set the voltage on J4 (VGG) to −4 V.

3. Set the voltage on J1 (VDD) to 50 V.

4. Turn on PULSE (0 V/5 V, 100 µs, 10% duty cycle).

5. Increase the voltage on J4 (VGG) until the target IDQ is reached

(nominally 300 mA).

6. Apply the RF input signal to the RFIN connector of the

ADPA1106-EVALZ.

Take the following steps to power down the ADPA1106-EVALZ:

1. Turn off the RF input signal.

2. Set the voltage on J4 (VGG) to −4 V.

3. Turn off PULSE (set to 0 V).

4. Set the voltage on J1 (VDD) to 0 V.

5. Set the voltage on J4 (VGG) to 0 V.

User Guide EVAL-ADPA1106

MAKING AVERAGE TO PULSED APPROXIMATIONS

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Instruments that can be triggered are required to measure the RF

power, drain current, and power added efficiency (PAE) accurately

under pulsed operation. When such instrumentation is not availa-

ble, use averaging and approximations. The most common approxi-

mations involve measuring the average values and then adjusting

those values to account for the duty cycle. These approximations

can result in errors because of limited measurement bandwidths

of instruments and/or the inclusion of on and off transients and/or

partial periods in the measurement.

To ensure that partial periods do not contribute significant errors

to the measurements, perform averaging over a large number of

pulse periods. The results of such approximations can vary with the

instruments and settings used. Therefore, experimentation can be

necessary to achieve credible and repeatable results. When it is

not possible to make pulse triggered measurements, the only pulse

connection required is the connection from the pulse generator to

the J3 connector of the pulser (see Figure 5).

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