Analog Devices ADPA1105-EVALZ User manual

ADPA1105-EVALZ User Guide

UG-1674

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

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 ADPA1105

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 VGG1 and VGG2 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.

UG-1674 ADPA1105-EVALZ User Guide

Rev. 0 | Page 2 of 13

TABLE OF CONTENTS

Features.............................................................................................. 1

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

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

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

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

Revision History ............................................................................... 2

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

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

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

Operating the ADPA1105-EVALZ with a Pulsed Gate Voltage 6

Setup............................................................................................... 6

Operation .......................................................................................6

Operating the ADPA1105-EVALZ with the Drain Bias Pulser

Board...................................................................................................7

Setup................................................................................................8

Operation .......................................................................................8

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

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

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

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

REVISION HISTORY

10/2020—Revision 0: Initial Version

ADPA1105-EVALZ User Guide UG-1674

Rev. 0 | Page 3 of 13

EVALUATION BOARD PHOTOGRAPHS

22011-001

Figure 1. ADPA1105-EVALZ Evaluation Board, Primary Side

22011-002

Figure 2. ADPA1105-EVALZ Evaluation Board, Secondary Side

UG-1674 ADPA1105-EVALZ User Guide

Rev. 0 | Page 4 of 13

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

Header Header Pin Number Header Pin Name

P1 1, 3 GND

2 DET2_OUT

4 DET2_BIAS

P2 1, 3 GND

2 DET1_OUT

4 DET1_BIAS

P3 1, 3, 5, 7, 9, 10, 11, 12, 13, 14, 15, 17, 19, 21, 22, 23, 24 GND

2, 16, 18, 20 Not connected

4, 6 VDD2

8 VDD1

P4 1, 2, 3, 4, 5, 7, 9, 11, 12, 13, 14, 15, 16, 17, 19, 21, 23 GND

18, 20, 22 Not connected

6, 8 VGG1

10 VGG2

24 DET2_BIAS

ADPA1105-EVALZ User Guide UG-1674

Rev. 0 | Page 5 of 13

INSERTION LOSS OF THE THROUGH CALIBRATION PATH

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. 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.

–50

–45

–40

–35

–30

–25

–20

–15

–10

–5

012345678910

INSERTION LOSS, INPUT RETURN LOSS AND

OUTPUT RETURN LOSS (dB)

FREQUENCY (GHz)

22011-003

OUTPUT RETURN LOSS

INPUT RETURN LOSS

INSERTION LOSS

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

UG-1674 ADPA1105-EVALZ User Guide

Rev. 0 | Page 6 of 13

OPERATING THE ADPA1105-EVALZ WITH A PULSED GATE VOLTAGE

To implement gate pulsed operation, apply a negative voltage

pulse to the ADPA1105 VGG1 and VGG2 inputs while the voltage

on the ADPA1105 VDD1 and VDD2 pins is held constant.

SETUP

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

(IDQ) to approximately 400 mA. The pulse width and duty cycle

must be approximately 100 μs and 10%, respectively.

OPERATION

Take the following steps to power-up:

1. Set VDDx (P3 Pin 4, Pin 6, and Pin 8) to 0 V.

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

VGG2 = −4 V).

3. Set 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 400 mA) while maintaining the pulse off

voltage level at −4 V.

6. Apply the RF input signal.

Take the following steps to power-down:

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.

ADPA1105-EVALZ User Guide UG-1674

Rev. 0 | Page 7 of 13

OPERATING THE ADPA1105-EVALZ WITH THE DRAIN BIAS PULSER BOARD

The ADPA1105-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 ADPA1105

on and off, and the LTC7000 is a high-side, negative channel

metal-oxide semiconductor (NMOS), static switch driver that

controls the MOSFET.

The pulser board plugs into the P3 and P4 headers of

ADPA1105-EVALZ and can be configured to provide a pulsed

drain voltage and a negative gate control voltage to control the

biasing of the ADPA1105.

Table 3. Pulser Board J1, J2, and J3 Header Connections

to ADPA1105

VIN

180pF

100V

VCC

VCCUV

FAULT

TIMER

PULSE

PULSEPULSE

VDET_BIAS /

VREF_BIAS

VDET_BIAS /

VREF_BIAS

CONNECTS DIRECTLY TO

EVAL BOARD P4

GND

INP

PEC02SAAN

81 Q1

BSC340N08NS3

SNS+

SNS–

BST

TGUP

TGDN

PAD

CMPD3003

LTC7000EMSE-13PBF

0Ω

100kΩ

1kΩ

VDD

0.1µF

100V

10µF

100V

10µF

100V

10µF

100V

C11

1000µF

80V

C13

1µF

C12

0.001µF

0.1µF

C10

3300µF

80V

VDD VDD

INPUTS

FROM USER

10µF

100V

CONNECTS DIRECTLY

TO EVAL BOARD P3

PULSED_VDD_DUT

2526

2324

2122

1920

1718

1516

1314

1112

910

VGG1, VGG2

GG1, VGG2 VGG1, VGG2

PULSED_VDD

FOR MONITORING

WITH HIGH-Z

OSCILLOSCOPE PROBE

0Ω

22011-004

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

Header Header Pin Number Header Pin Name

J1 1, 2, 3, 4, 5, 6 VDD

7, 8, 25 No connect

9, 10, 11, 12, 13, 14 VGG1, VGG2

15, 16, 17, 18, 21, 22, 23, 24 GND

19, 20 PULSE

26 VDET_BIAS, VREF_BIAS

J2 1, 3, 5, 7, 9, 10, 11, 12, 13, 14, 15,

17, 19, 21, 22, 23, 24

GND

2, 16, 18, 20 No connect

4, 6, 8 PULSED_VDD_DUT

J3 1, 2, 3, 4, 5, 7, 9, 11, 12, 13, 14,

15, 16, 17, 19, 21, 23

GND

6, 8 ,10 VGG1, VGG2

24 VDET_BIAS, VREF_BIAS

UG-1674 ADPA1105-EVALZ User Guide

Rev. 0 | Page 8 of 13

SETUP

The connections required to use the ADPA1105-EVALZ with

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

any bias or signals, plug the pulser board into ADPA1105-EVALZ

so that the pulser board J2 header connector connects to the

ADPA1105-EVALZ P3 header, and the pulser board J3 header

connects to the ADPA1105-EVALZ P4 header. All external

supply voltages and control signals are applied to the pulser

board J1 header, which are listed in Table 3.

The gate control voltage applied to the J1 connector, Pin 9 to

Pin 14, passes directly through the pulser board and drives the

ADPA1105 VGG1 pin and VGG2 pin. 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 ADPA1105 VDD1 and VDD2 pins, connect an oscilloscope to

the J4 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 pins of J1, Pin 19 and Pin 20.

To observe and measure the drain current and the ADPA1105

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.

OPERATION

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

all signals are applied to the pulser board):

1. Set the voltage on Pin 19 and Pin 20 of J1 (PULSE) to 0 V.

2. Set the voltage on Pin 9 to Pin 14 of J1 (VGG1, VGG2) to

−4 V.

3. Set the voltage on Pin 1, Pin 2, Pin 3, Pin 4, Pin 5 and Pin 6

of J1 (VDDx) to 50 V.

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

5. Increase the voltage on Pin 9 to Pin 14 of J1 (VGG1,

VGG2) until the target IDQ is reached (nominally 400 mA).

6. Apply the RF input signal to the ADPA1105-EVALZ RFIN

connector.

Take the following steps to power-down:

1. Turn off the RF input signal.

2. Set the voltage on Pin 9 to Pin 14 of J1 (VGG1, VGG2)

to −4 V.

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

4. Set the voltage on Pin 1 to Pin 6 of J1 (VDD) to 0 V.

5. Set the voltage on Pin 9 to Pin 14 of J1 (VGG1, VGG2) to 0 V.

ADPA1105-EVALZ User Guide UG-1674

Rev. 0 | Page 9 of 13

22011-005

PULSE GENERATOR

SYNC OUT PULSE OUT

DRAIN PULSER

BOARD

ADPA1105 EVAL BOARD

RFOUTRFIN ATTENUATOR

INPUT OUTPUT

POWER METER

TRIGGER IN CH 1 CH 2

DIRECTIONAL

COUPLER

INPUT

COUPLED

OUTPUT

DIRECTIONAL

COUPLER

INPUT

COUPLED

OUTPUT

RF SIGNAL

GENERATOR

TRIGGER IN RF OUT

ATTENUATOR

POWER

SENSOR 1

OUTPUTINPUT

50Ω

TERMINATION

INPUT

AMPLIFIER

OUTPUT INPUT

OSCILLOSCOPE

CH 1 CH 3CH 2

VDD AND IDD

MONITORING

TRIGGER

TEKTRONIX

TCPA300

CURRENT

PROBE

TEKTRONIX

TCPA312A

DC SUPPLY

+50V/2AGND

DC SUPPLY

GGx

0V TO –4V GND

PULSED_VDD

VDD VGG1 GNDSENSE PULSE

ATTENUATOR

POWER

SENSOR 2

OUTPUTINPUT

Figure 5. Setup Block Diagram

UG-1674 ADPA1105-EVALZ User Guide

Rev. 0 | Page 10 of 13

MAKING AVERAGE TO PULSED APPROXIMATIONS

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

available, use averaging and approximations. The most

common approximations 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 J1 connector of

the pulser (see Figure 5).

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