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 INTRODUCTION TYPICAL PERFORMANCE DATA 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 Technology section provides more insight about how harmonic emissions are attenuated, as well as further details about the integrated passive device. Table 2 shows typical performance data obtained from the ADF7023 using the 0900PC15F0030 impedance matched filter balun. Parameter Part Number Frequency Unbalanced Port Impedance Balanced Port Impedance Description 0900PC15F0030 862 MHz to 928 MHz 50 Matched to ADF7023, ADF7023-J, and ADF7024 RF port impedance Parameter Transmitter (Tx) Output Power Harmonics Second Harmonic Third Harmonic Fourth Harmonic Fifth Harmonic Value (dBm) 11.5 -36 -44 -47 -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 EVAL-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 Table 1. Key Parameters of the Filter Balun Table 2. Typical Performance of the ADF7023 Using the 0900PC15F0030 Filter Balun Figure 1. EVAL-ADF7023DB5Z Board Layout Highlighting the Integrated Passive Device Location Rev. 0 | Page 1 of 6 AN-1484 Application Note TABLE OF CONTENTS Introduction ...................................................................................... 1 Additional Information from Johanson Technology ....................4 Typical Performance Data ............................................................... 1 General Specifications and Storage Parameters ........................4 Evaluation Board Layout ................................................................. 1 Mechanical Dimensions ...............................................................4 Revision History ............................................................................... 2 Terminal Configurations and Measurements............................5 Evaluation Board Schematic ........................................................... 3 REVISION HISTORY 2/2018--Revision 0: Initial Version Rev. 0 | Page 2 of 6 Application Note AN-1484 EVALUATION BOARD SCHEMATIC P2-3 P2-4 P2-1 P2-2 R8 DNI R9 DNI Y2 VDD_RF_BAT P2-7 32.768kHz C39 VDD_RF_BAT P2-5 P3-3 5.6pF 5.6pF P2-6 C26 C14 220nF C15 100pF P3-2 C40 P3-4 P3-6 10F P3-8 C28 P2-8 P3-9 220nF P3-10 VDD_RF_BAT P2-10 P3-12 P2-9 26 27 28 29 IRQ_GP3 GP2 GP1 GP0 24 P3-5 23 P3-7 22 P3-11 21 P3-15 R16 20 1.1k P3-17 19 P3-19 18 P3-18 17 P3-16 R3 DNI C1 1.5nF 220nF 16 DGUARD 15 CREGDIG1 30 31 25 GP4 CREGDIG2 XOSCKP_GP5_ATB1 XOSC32KN_ATB2 VDDBAT1 ADCIN_ATB3 220nF C33 VDDBAT2 220nF 9 NC MOSI 33 PADDLE VDDBAT2 C30 P1-7 ATB4 RF02 P3-20 P3-1 MISO XOSC26N 8 U1 R15 100k SCLK ADF7023BCPZ RFIO_1N 14 GND 7 RFIO_1P XOSC26P 6 13 5 6 1 GND GND GND 4 2 5 10 GND TX 7 CREGRF2 CWAKEUP RX_N RBIAS 12 RX_P ANT 4 P3-14 CS 150nF 3 3 CREGSYNTH 56pF 2 8 11 C18 9 10 DC FEED CREGRF1 U2 0900PC15F0030 ADCVREF C25 1 36k R12 CREGVCO C23 18pF 220nF 32 C16 220nF C62 10F C65 C42 C37 P1-9 220nF C27 R4 100pF P1-1 C34 P1-2 18pF 3 XTALXTAL 1 DNI P1-3 C35 Y1 2 GND GND 4 18pF NX3225SA-26.000000MHZ-G2 P1-4 P1-5 P1-6 P1-8 16341-002 J1 P3-13 220nF VCOGUARD C24 P1-10 Figure 2. EVAL-ADF7023DB5Z Schematic Rev. 0 | Page 3 of 6 AN-1484 Application Note 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. MECHANICAL DIMENSIONS The mechanical dimensions are shown in Figure 4 and explained in Table 5. TOP GENERAL SPECIFICATIONS AND STORAGE PARAMETERS B W Table 3. General Specifications Insertion Loss Return Loss Phase Balance Amplitude Difference Attenuation 16341-003 Power Capacity Operating Temperature Value 0900PC15F0030 862 MHz to 928 MHz Impedance matched to Analog Devices ADF7023, ADF7023-J, and ADF7024 1.8 dB (typical), 2.3 dB (maximum) 10 dB (minimum) 180 15 2.0 dB (maximum) 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 3 W (maximum) continuous wave -40C to +85C L BOTTOM C A T SIDE Figure 4. Mechanical Dimensions Table 5. Mechanical Dimensions Label in Figure 4 L W T A B C D Figure 3. 0900PC15F0030 Table 4. Storage Parameters Parameter Storage Temperature Range Storage Period Recommended Storage Conditions for Unused Tape and Reel Product D 16341-004 Parameter Part Number Frequency Balanced Port Impedance Value -40C to +85C 18 months maximum 5C to 35C, 45% to 75% relative humidity, 18 months maximum Rev. 0 | Page 4 of 6 Dimension in Inches (In) 0.079 0.008 0.049 0.008 0.039 (maximum) 0.010 0.004 0.012 0.006 0.008 + 0.004, 0.008 - 0.006 0.020 0.004 Dimension in Millimeters (mm) 2.00 0.2 1.25 0.2 1.00 (maximum) 0.25 0.1 0.30 0.2 0.20 + 0.1, 0.20 - 0.15 0.50 0.1 Application Note AN-1484 TERMINAL CONFIGURATIONS AND MEASUREMENTS SXX is the reflection coefficient on Port X, and SXY is the transmission coefficient between Port X and Port Y. The terminal configurations are shown in Figure 5 and described in Table 6. In Figure 8, DD means differential to differential, DS means differential to single-ended, and SS means single-ended to single-ended. 9 8 7 6 10 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. 1 2 3 4 16341-005 5 S parameter files are available upon request from Johanson Technology, Inc. Figure 5. Terminal Configuration Table 6. Terminal Configuration Label in Figure 5 1 2 3 4 5 6 7 8 9 10 Connection to ADF7023/ ADF7023-J/ADF7024 Ground Ground Antenna connector Ground Ground RFO2 (RFO on the ADF7024) RFIO_1N (RFI_N on the ADF7024) RFIO_1P (RFI_P on the ADF7024) CREGRF2 Ground Mnemonic GND GND ANT GND GND TX RX_N RX_P DC Feed GND Tx Mode Measurements In Figure 6, the following conditions apply for Tx mode: * * * * * Port 1 load impedance: 50 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 The measurement setup is shown in Figure 6. The connections are as follows: Rx Mode Measurements * * * * * * 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 In Figure 6, the following conditions apply for Rx mode: * This data is provided courtesy of Johanson Technology, Inc. PORT 1 * * PORT 3 NETWORK ANALYZER PORT 4 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: PORT 2 * GND * GND GND 16341-006 GND 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 GND GND Port 1 load impedance: 50 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 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. Figure 6. Measuring Diagram Rev. 0 | Page 5 of 6 Application Note 200 3 150 2 100 1 50 -30 0 0 -40 -1 -50 -2 -100 -3 -150 -50 0.5 1.0 1.5 2.0 2.5 3.0 3.5 FREQUENCY (GHz) 4.0 4.5 5.0 Figure 7. Tx Mode Insertion Loss (TXS31), Return Loss (TXS11), and Attenuation (TXS33) -10 RX SSS11 RX SDS21 RXSDD22 -30 -40 -60 1.0 1.5 2.0 2.5 3.0 3.5 FREQUENCY (GHz) 4.0 4.5 5.0 16341-008 -50 0.5 -200 0.6 0.7 0.8 0.9 1.0 1.1 1.2 FREQUENCY (GHz) Figure 9. Rx Mode Phase Difference and Amplitude Difference 0 -20 -4 0.5 Figure 8. Rx Mode Insertion Loss (RXSSS11), Return Loss (RXSDS21), and Attenuation (RXSDD22) (c)2018 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. AN16341-0-2/18(0) Rev. 0 | Page 6 of 6 16341-009 AMPLITUDE DIFFERENCE TXS31 TXS11 TXS33 -20 -60 INSERTION LOSS, RETURN LOSS, AND ATTENUATION 4 -10 16341-007 INSERTION LOSS, RETURN LOSS, AND ATTENUATION 0 PHASE DIFFERENCE AN-1484