AN-1484
APPLICATION NOTE
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
Johanson Technology Impedance Matched, Integrated Passive Filter Balun for Use
with ADF7023, ADF7023-J, and ADF7024
by Liam O’Hora
Rev. 0 | Page 1 of 6
INTRODUCTION
This application note describes the use and performance achieved
using the Johanson Technology, Inc., 0900PC15F0030 impedance
matched, integrated, passive filter balun with the ADF7023,
ADF7023-J, and ADF7024 RF transceivers in the 862 MHz to
928 MHz frequency range. The filter balun combined match
from Johanson Technology effectively reduces the RF front-end
component count and layout space and simplifies the RF front-end
printed circuit board (PCB) design, while still maintaining the
radio performance requirements. This balun is 100% radio
frequency (RF) tested by Johanson Technology, thus reducing
system variability. The Additional Information from Johanson
Technolog y section provides more insight about how harmonic
emissions are attenuated, as well as further details about the
integrated passive device.
Table 1. Key Parameters of the Filter Balun
Parameter Description
Part Number 0900PC15F0030
Frequency 862 MHz to 928 MHz
Unbalanced Port Impedance 50 Ω
Balanced Port Impedance Matched to ADF7023,
ADF7023-J, and ADF7024 RF
port impedance
TYPICAL PERFORMANCE DATA
Table 2 shows typical performance data obtained from the
ADF7023 using the 0900PC15F0030 impedance matched
filter balun.
Table 2. Typical Performance of the ADF7023 Using the
0900PC15F0030 Filter Balun
Parameter Value (dBm)
Transmitter (Tx) Output Power 11.5
Harmonics
Second Harmonic −36
Third Harmonic −44
Fourth Harmonic −47
Fifth Harmonic −44
EVALUATION BOARD LAYOUT
An outline of the RF board layout is shown in Figure 1. Gerber
files of the board layout are available on the Analog Devices, Inc.,
ADF7023 product website. Because the impedance seen by the
balun is inherently dependent on the layout, it is recommended
to follow the E VA L -ADF7023DB5Z layout as shown in the
Gerber files as closely as possible for optimum performance.
The board schematic is shown in Figure 2.
16341-001
Figure 1. EVAL-ADF7023DB5Z Board Layout Highlighting the Integrated
Passive Device Location
AN-1484 Application Note
Rev. 0 | Page 2 of 6
TABLE OF CONTENTS
Introduction ...................................................................................... 1
Typical Performance Data ............................................................... 1
Evaluation Board Layout ................................................................. 1
Revision History ............................................................................... 2
Evaluation Board Schematic ........................................................... 3
Additional Information from Johanson Technology ....................4
General Specifications and Storage Parameters ........................4
Mechanical Dimensions ...............................................................4
Terminal Configurations and Measurements............................5
REVISION HISTORY
2/2018—Revision 0: Initial Version
Application Note AN-1484
Rev. 0 | Page 3 of 6
EVALUATION BOARD SCHEMATIC
R12 36kΩ
C30 220nF
C34
18pF
C35
18pF
C33 220nF
C40
5.6pF
C39
5.6pF
C14 220nF
C16
220nF
R8 DNI
R9 DNI
C25220nF
R15
100kΩ
C37 220nF
C15 100pF
C28 220nF
1
CREGRF1
2RBIAS
3CREGRF2
4RFIO_1P
5RFIO_1N
6RF02
7VDDBAT2
8NC
9CREGVCO
10 VCOGUARD
11 CREGSYNTH
12 CWAKEUP
13 XOSC26P
14 XOSC26N
15 DGUARD
16 CREGDIG1
17
GP0
18
GP1
19
GP2
20
IRQ_GP3
21
MISO
22
SCLK
23
MOSI
24
CS
25
GP4
26
CREGDIG2
27
XOSCKP_GP5_ATB1
28
XOSC32KN_ATB2
29
VDDBAT1
30
ADCIN_ATB3
31
ATB4
32
ADCVREF
33
PADDLE
U1
ADF7023BCPZ
C62 150nF
C27
100pF
C2318pF
C24 220nF
Y2
32.768kHz
C26 10µF
C42 10µF
R16 1.1kΩ
C1
1.5nF
P1-2
P1-3
P1-4
P1-5
P1-6
P1-7
P1-8
P1-9
P1-10
P3-1
P3-2
P3-3
P3-4
P3-5
P3-6
P3-7
P3-8
P3-9
P3-10
P3-11
P3-12
P3-13
P3-14
P3-15
P3-16
P3-17
P3-18
P3-19
P3-20
P2-10
P2-7
P2-9
P2-3
P2-8
P2-4
P2-6
P2-5
P2-2
P2-1
4
GND
3XTAL
2GND
1
XTAL
Y1
NX3225SA-26.000000MHZ-G2
R3
DNI
C65220nF
R4 DNI
C18 56pF
P1-1
1GND
2GND
3ANT
4GND
5GND
6
TX
7
RX_N
8
RX_P
9
DC FEED
10 GND
U2
0900PC15F0030
J1
VDD_RF_BAT
VDD_RF_BAT
VDD_RF_BAT
VDDBAT2
16341-002
Figure 2. EVAL-ADF7023DB5Z Schematic
AN-1484 Application Note
Rev. 0 | Page 4 of 6
ADDITIONAL INFORMATION FROM JOHANSON TECHNOLOGY
The following content is provided courtesy of Johanson
Technology, Inc. Johanson Technology is an independent
corporation and is not owned by, controlled by, or an affiliate of
Analog Devices, Inc. Analog Devices makes no representations
or warranties with respect to the Johanson 0900PC15F0030 or
any other Johanson Technology products.
GENERAL SPECIFICATIONS AND STORAGE
PARAMETERS
Table 3. General Specifications
Parameter Value
Part Number 0900PC15F0030
Frequency 862 MHz to 928 MHz
Balanced Port
Impedance
Impedance matched to Analog
Devices ADF7023, ADF7023-J, and
ADF7024
Insertion Loss 1.8 dB (typical), 2.3 dB (maximum)
Return Loss 10 dB (minimum)
Phase Balance 180° ± 15°
Amplitude Difference 2.0 dB (maximum)
Attenuation 33 dB (minimum) at 1736 MHz to
1856 MHz
40 dB (minimum) at 2604 MHz to
2784 MHz
40 dB (minimum) at 3472 MHz to
3712 MHz
35 dB (minimum) at 4340 MHz to
4640 MHz
Power Capacity 3 W (maximum) continuous wave
Operating Temperature −40°C to +85°C
16341-003
Figure 3. 0900PC15F0030
Table 4. Storage Parameters
Parameter Value
Storage Temperature Range −40°C to +85°C
Storage Period 18 months maximum
Recommended Storage
Conditions for Unused Tape
and Reel Product
5°C to 35°C, 45% to 75%
relative humidity,
18 months maximum
MECHANICAL DIMENSIONS
The mechanical dimensions are shown in Figure 4 and
explained in Table 5.
B
T
W
L
TOP
BOTTOM
C
SIDE
A D
16341-004
Figure 4. Mechanical Dimensions
Table 5. Mechanical Dimensions
Label in
Figure 4
Dimension in
Inches (In)
Dimension in
Millimeters (mm)
L 0.079 ± 0.008 2.00 ± 0.2
W 0.049 ± 0.008 1.25 ± 0.2
T 0.039 (maximum) 1.00 (maximum)
A 0.010 ± 0.004 0.25 ± 0.1
B 0.012 ± 0.006 0.30 ± 0.2
C 0.008 + 0.004,
0.008 − 0.006
0.20 + 0.1,
0.20 – 0.15
D 0.020 ± 0.004 0.50 ± 0.1
Application Note AN-1484
Rev. 0 | Page 5 of 6
TERMINAL CONFIGURATIONS AND
MEASUREMENTS
The terminal configurations are shown in Figure 5 and
described in Table 6.
1 2 3 4
9 8 7 6
5
10
16341-005
Figure 5. Terminal Configuration
Table 6. Terminal Configuration
Label in
Figure 5 Mnemonic
Connection to ADF7023/
ADF7023-J/ADF7024
1 GND Ground
2 GND Ground
3 ANT Antenna connector
4 GND Ground
5 GND Ground
6 TX RFO2 (RFO on the ADF7024)
7 RX_N RFIO_1N (RFI_N on the ADF7024)
8 RX_P RFIO_1P (RFI_P on the ADF7024)
9 DC Feed CREGRF2
10 GND Ground
The measurement setup is shown in Figure 6. The connections are
as follows:
•Port 1 is connected to the ANT pin
•Port 2 is connected to the RX_N pin
•Port 3 is connected to the TX pin
•Port 4 is connected to the RX_P pin
This data is provided courtesy of Johanson Technology, Inc.
PORT 4
GND
GND
PORT 2
PORT 1 PORT 3
NETWORK
ANALYZER
GND
GND GND GND
16341-006
Figure 6. Measuring Diagram
SXX is the reflection coefficient on Port X, and SXY is the
transmission coefficient between Port X and Port Y.
In Figure 8, DD means differential to differential, DS means
differential to single-ended, and SS means single-ended to
single-ended.
The insertion loss (IL) and return loss (RL) scattering
parameters (S parameters) applicable to Tx mode are defined in
the Tx Mode Measurements section. Likewise, in receiver (Rx)
mode, they are defined in the Rx Mode Measurements section.
S parameter files are available upon request from Johanson
Technology, Inc.
Tx Mode Measurements
In Figure 6, the following conditions apply for Tx mode:
•Port 1 load impedance: 50 Ω
•Port 3 load impedance: complex conjugate to power
amplifier (PA) output impedance of the ADF7023,
ADF7023-J, and ADF7024; single-ended PA in Tx mode
•Port 2 and Port 4 load impedance: low noise amplifier
(LNA) input impedance in Tx mode of the ADF7023,
ADF7023-J, and ADF7024
•IL = S31
•RL = S11/S33
Rx Mode Measurements
In Figure 6, the following conditions apply for Rx mode:
•Port 1 load impedance: 50 Ω
•Port 3 load impedance: PA impedance in Rx mode of
ADF7023, ADF7023-J, and ADF7024
•Port 2 and Port 4 load impedance: complex conjugate to
LNA input impedance in Rx mode of ADF7023, ADF7023-J,
and ADF7024
•IL = SDS21
•RL = SSS11/SDD22
SXY is the transmission coefficient between Port X and Port Y,
effectively the loss (or gain) between Port 1 and Port 4 or
between Port 1 and Port 2, as follows:
•Amplitude balance is the difference in amplitude between
S12 and S14 in decibels.
•Phase balance is the difference in phase between S12 and S14
in degrees.
Typical Electrical Characteristics
Figure 7 to Figure 9 show the typical electrical characteristics
using the Tx and Rx conditions and setup described in the
Terminal Configurations and Measurements section.
AN-1484 Application Note
Rev. 0 | Page 6 of 6
INSERTION LOSS, RETURN LOSS,
AND ATTENUATION
0
–10
–20
–30
–40
–50
–600.5 1.0 1.5 2.0 2.5
FREQUENCY (GHz)
3.0 3.5 4.0 4.5 5.0
16341-007
TX
S31
TX
S11
TX
S33
Figure 7. Tx Mode Insertion Loss (TXS31), Return Loss (TXS11),
and Attenuation (TXS33)
0
–10
–20
–30
–40
–50
–600.5 1.0 1.5 2.0 2.5
FREQUENCY (GHz)
3.0 3.5 4.0 4.5 5.0
16341-008
INSERTION LOSS, RETURN LOSS,
AND ATTENUATION
RX
SSS11
RX
SDS21
RX
SDD22
Figure 8. Rx Mode Insertion Loss (RXSSS11), Return Loss (RXSDS21), and
Attenuation (RXSDD22)
Figure 9. Rx Mode Phase Difference and Amplitude Difference
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registered trademarks are the property of their respective owners.
AN16341-0-2/18(0)