Espressif ESP8266 Matching Manual
Hardware matching guide
Hide thumbs
Also See for ESP8266:
- Technical reference (100 pages) ,
- User manual (51 pages) ,
- System description (30 pages)
Table of Contents
Advertisement
Quick Links
Advertisement
Table of Contents
Related Manuals for Espressif ESP8266
Summary of Contents for Espressif ESP8266
- Page 1 ESP8266 Hardware Matching Guide Version 1.0 Copyright © 2016...
- Page 2 About This Guide This document introduces frequency offset tuning and antenna impedance matching for ESP8266 in order to achieve optimum RF performance. Chapter Title Subject Relevance of frequency offset adjustment and impedance Chapter 1 Overview matching. Chapter 2 Frequency Offset Tuning Introduction to frequency offset testing and tuning methods.
- Page 3 Table of Contents 1. Overview ..........................2. Frequency Offset Tuning ......................2.1. Testing Frequency Offset ......................2.2. Adjusting Frequency Offset ......................3. Impedance Matching ......................
- Page 4 1. Overview Overview ESP8266 is the most integrated System-on-a-Chip (SoC) with only 7 external components. In order to achieve the optimum performance of the chip, customers only need to tune the frequency offset and match the antenna impedance according to the crystal oscillator and antenna.
- Page 5 - Decrease capacitance if the frequency offset is negative, for example -50 ppm. - Generally, the capacitances should be matched and adjusted at the same time. 2. Modify the frequency offset in ESP8266 DOWNLOAD TOOL. Click LoadInitBin to load esp_init_data_default.bin, modify PraticalFreqOffset and click GenInitBin to generate a new esp_init_data_default.bin to download to Flash.
- Page 6 2. Frequency Offset Tuning Figure 2-2. ESP8266 DOWNLOAD TOOL - RFConfig Tab �� Note: ESP8266 DOWNLOAD TOOL can be downloaded from: http://www.espressif.com/en/support/download/other-tools. Espressif ! /! 3 5 2016.06...
- Page 7 3. Impedance Matching Impedance Matching The impedance of ESP8266 PA output end is 39+j6 Ω, so the matched impedance is 39-j6 Ω (from antenna to the chip). For EMC test, the π-type impedance matching circuit of external antenna should be as shown in Figure 3-1.
- Page 8 The Wi-Fi Alliance Member logo is a trademark of the Wi-Fi Alliance. The Bluetooth logo is a registered trademark of Bluetooth SIG. All trade names, trademarks and registered trademarks mentioned in this document are Espressif IOT Team property of their respective owners, and are hereby acknowledged. Copyright © 2016 Espressif Inc. All rights reserved. www.espressif.com...
Need help?
Do you have a question about the ESP8266 and is the answer not in the manual?
Questions and answers