Related Manuals for Furuno GN-86F
Summary of Contents for Furuno GN-86F
- Page 1 FURUNO GPS/ GNSS Receiver GN-86/87, GV-86/87 and Model: GT-86/87 Series User’s Design Guide (Document No. SE13-900-001-06)
- Page 2 You expressly acknowledge and agree that use of the "Application Note" is at your sole risk. This "Application Note" is provided 'AS IS' and without warranty of any kind and FURUNO expressly disclaims all other warranties, express or implied, including, but not limited to, the implied warranties of merchantability, fitness for a particular purpose and no infringement.
- Page 3 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Revision History Version Description Date Initial release 2013.06.07 preliminary release 2013.06.14 preliminary release 2013.07.18 Formal revision release 2013.12.11 Corrected Figure 3-1, 3-2 and 3-6 2014.10.09 Updated Chapter 1, Chapter 6 and Contact Information Corrected the cover 2015.05.26...
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Page 4: Table Of Contents
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Table of contents General Description ········································································································ 1 RF Section PCB Layout Design ························································································ 1 PCB Ground Layout Design ······················································································· 3 Microstrip Line Design ······························································································ 4 ESD protection by λ/4 short stub ················································································ 6 DC Feed Inductor ······································································································... -
Page 5: General Description
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 General Description This document presents the useful design guidance to improve the performance and the quality of our customers’ products that contain FURUNO 86/87 series GPS/GNSS receiver modules (86/87 series module) listed as below. - GN-86F - GV-86... - Page 6 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Figure 2-2 shows an overview of the RF section PCB design for using the passive antenna. There is no need to bias the antenna, so 39nH inductor and 33pF capacitor are removed from Figure 2-1.
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Page 7: Pcb Ground Layout Design
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 PCB Ground Layout Design At the bottom of the module, there are some signal lines and via holes. For avoiding any signal shortage, please do not put any signal line nor via hole at the part of the user’s board where is facing to the bottom of the module. -
Page 8: Microstrip Line Design
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Microstrip Line Design The PCB design of RF line from the antenna connector to RF_IN pin is very important for keeping the reception sensitivity performance of the receiver module. For achieving the best performance, please follow the design guidelines below. - Page 9 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Figure 2-5 shows Transmission Loss-Frequency characteristics of the microstrip line shown in Figure 2-4. It is simulated by Agilent ADS MSub MLIN MSUB Subst="MSub1" MSub1 Term Term W=0.31 mm H=0.178 mm...
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Page 10: Esd Protection By Λ/4 Short Stub
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 ESD Protection by λ/4 Short Stub The implementation of λ/4 short stub is the best way to improve the product’s robustness against ESD coming through RF line. λ/4 short stub is structured with the microstrip line, and the input impedance depends on the electrical length of it. - Page 11 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Microstrip Line MSub MLIN MLIN MSUB Subst="MSub1" Subst="MSub1" MSub1 Term W=0.31 mm W=0.31 mm H=0.178 mm Term2 L=18 mm L=5.5 mm Er=4.3 Num=2 Term Mur=1 Z=50 Ohm MLIN Term1 Cond=5.96e7 Num=1 Hu=1000 mm Subst="MSub1"...
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Page 12: Dc Feed Inductor
30mA or less for LNA bias current, and HK1005 series inductor can supply 150mA or more, so this series can be used for almost applications. From above verifications, HK100539NJ-T is recommended. This device is also selected for FURUNO 86/87 series module Evaluation Kit. - Page 13 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Figure 2-9 Impedance-Frequency Characteristics of HK1005 Series 0.14 0.12 0.08 0.06 0.04 0.02 Figure 2-10 Insertion Loss by Implementing HK1005 Series @1589MHz FURUNO ELECTRIC CO., LTD. All rights reserved.
- Page 14 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 It is recommended that DC Feed Inductor is placed close to the microstrip line as much as possible. If the soldering pad of the inductor is smaller than the width of the microstrip line, it should be placed on the microstrip line without any routing as shown in Figure 2-11.
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Page 15: Antenna Interface
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Antenna Interface LNA Gain Selection 86/87 series modules have selectable gain LNA inside, which is able to be set to high gain mode or low gain mode for adapting various antennas. The high gain mode is applicable for using the passive antenna or the low gain active antenna, and the low gain mode for using the high gain active antenna, as shown in Table 3-1. -
Page 16: Bias Circuit Design For Active Antenna
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Bias Circuit Design for Active Antenna 86/87 series module supports two ways to bias the active antenna. One is to use VCC_RF pin, which is designed to supply the antenna power from the module, as shown at the left side in Figure 3-1. The other is to provide from an independent antenna power (VANT) which is prepared by customer’s system, as shown... -
Page 17: Passive Antenna Connection
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Passive Antenna Connection Figure 3-3 shows the simplest circuit for passive antenna connection. Since the LNA in the module should be configured to high gain mode for passive antenna, so FLNA pin is left Open (no connection). The routing between the passive antenna and RF_IN pin should follow the microstrip line design rule as described in Section 2.2. -
Page 18: Saw Filter Insertion
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 SAW Filter Insertion 86/87 series module contains SAW filter after the internal LNA, so normally it is not necessary to insert SAW filter on the user’s board. But if the antenna receives very strong interference signal, it can cause the saturation of the internal LNA, then the reception performance can be degraded. -
Page 19: Antenna Detection Circuit
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Antenna Detection Circuit 3.5.1 Antenna Detection Circuit Overview 86/87 series module has two digital input pins (ANT_DET0 and ANT_DET1) to sense the status of the active antenna connection. These 2 input pins are designed to recognize 3 states of the antenna connection, that are “Antenna Open”, “Normal”... -
Page 20: Antenna Detection/Protection Circuit
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 3.5.2 Antenna Detection/Protection Circuit The Antenna Detection Circuit, shown at the right side in Figure 3-8, contains one sensing resistor (R1) and two comparators. The sensing resistor is inserted between VANT and the antenna connector, and all the antenna bias current runs through this, so the voltage drop (VANT –... - Page 21 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Over Current Protection Antenna Detection Circuit VANT VANT Circuit 0.25W 0.1uF 0.1uF 1.2k ANT_DET0 Under Current Detect VREF_O R3 3k Rail to Rail In Open Collector/Drain ANT_DET1 Over Current Detect VREF_S...
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Page 22: Modification Of Antenna Short/Open Threshold
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 3.5.3 Modification of Antenna Short/Open Threshold The threshold currents for detecting “Antenna open” and “Antenna short” are able to be changed with adjusting the values of resistors in Antenna Detection Circuit. -
Page 23: Layout Design With Patch Antenna
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Layout Design with Patch Antenna 3.6.1 Incurrence to Antenna Characteristics by Layout As the following electrical characteristics of patch antenna are changed due to ground plane effect by placement of where the patch antenna is located and VSWR, user has to ask antenna vendor to do tuning of the electrical characteristics with actual location environment. - Page 24 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Table 3-7 Measurement Data Measurement Data PCB1 PCB2 PCB3 Measurement Item 25mm 18mm 12mm 25mm 18mm 12mm 25mm 18mm 12mm 1575MHz[dB] -17.9 -23.6 -31.6 -16.1 -12.7 -20.2 -12.3 -4.3 -2.8 Return Loss (*1) B.W.@-10dB[MHz] 29.3...
- Page 25 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 This graph shows the directivity pattern. You can observe directivity has influence by implementation position on the PCB. PCB# Y-Z Plane Z-X Plane Figure 3-12 Directivity Pattern (25 mm x 25 mm Size Patch Antenna)
- Page 26 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 PCB# Y-Z Plane Z-Plane Figure 3-13 Directivity Pattern (18 mm x 18 mm Size Patch Antenna) FURUNO ELECTRIC CO., LTD. All rights reserved.
- Page 27 FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 PCB# Y-Z Plane Z-X Plane Figure 3-14 Directivity Pattern (12 mm x 12 mm Size Patch Antenna) FURUNO ELECTRIC CO., LTD. All rights reserved.
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Page 28: Noise Influence Issue By Layout
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 3.6.2 Noise Influence Issue by Layout As patch antenna may have the influence radiation noise from via hole on the bottom side of antenna, layout of bottom side of antenna should be no via hole. -
Page 29: Bypass Capacitor For Vcc
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Bypass Capacitor for VCC Since 86/87 series module internally has bypass capacitors for VCC, so it is not required to implement any bypass capacitor on the customer’s board. However, in case the ripple noise on VCC line is more than ±50 mV, the additional bypass capacitor is required to be placed close to VCC pin. -
Page 30: Related Documents
FURUNO GPS/GNSS Receiver 86/87 Series User's Design Guide SE13-900-001-06 Related Documents -GN-86F Hardware Specifications (Document No. G13-000-10-003) -GN-87F Hardware Specifications (Document No. G13-000-10-001) -GN-8615 Hardware Specifications (Document No. G14-000-10-007) -GN-8715 Hardware Specifications (Document No. G14-000-10-009) -GV-86 Hardware Specifications (Document No. G13-000-10-008) -GV-87 Hardware Specifications (Document No.