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Semtech:ISM频带为扩展频谱无线电收发机护航

Semtech:ISM频带为扩展频谱无线电收发机护航0

元器件交易网讯 11月7日消息,据外媒 Electronicsweekly报道,高质量模拟和混合信号半导体产品领先供应商Semtech(先科公司)推出扩展频谱无线电收发机SX127x系列,支持GFSK调制。最大的吸引力是它的抗干扰性,在人口越来越多的前提下,其470MHz、868MHz的ISM频带日益凸显其抗干扰性的重要因素。

扩展频谱无线电收发机直接对中频采样信号进行处理,经过内部处理之后直接输出传输的基带信息信号。但是,扩频技术应用有时并不符合成本效益中的低成本工业网络应用,如传感器网络和智能电表。

Semtech公司表示,”公司现已开发出无线电平台LORA,它可使扩频无线电设备增加对源于LTE信号的sub-GHz工业网络频段抗干扰性。“

Semtech:ISM频带为扩展频谱无线电收发机护航1

SX127x系列可提供超过100dB的带外干扰信号阻断免疫。在欧洲,推出的4G/LTE移动网络普遍使用频段和传统868MHz频段比较接近,这将会对安全系统、烟雾探测器、灯光控制、家庭自动化和智能电表应用都会带去干扰。

此外,SX127x系列提供 sub-GHz频率4G/LTE信号的免疫力。可应用于工业、科学和医疗(ISM)频段应用等领域,如安全性和计量设备。

SX127x系列可实现超过15公里(99英里)郊区环境下、2-5公里93英里)人口密集的城市环境下的抗干扰性;但是其应用于安全和工业自动化系统的最广泛有限范围为1-2公里(小于1.25英里)郊区环境下,同时将在美国、欧盟、中国和日本的监管限制下经营实行。

SX1276系列涵盖所有主要sub-GHz频段,而SX1277则是针对5-40kbit/s速率的数据传输应用程序,如安全系统。

随着软件无线电以及超大规模集成电路技术和电子设计自动化技术的发展,扩展频谱系统由于具有通信距离远、通信容量大、传输质量好,保密性强等优点,在现代通信系统中具有广阔的应用前景。(元器件交易网龙燕 译)

外媒原文:

ISM bands protected by spread spectrum transceiver

Semtech has introduced a spread spectrum radio transceiver which also supports GFSK modulation in the one device.

The attraction of using spread spectrum radio is its immunity to interference, an increasingly important factor in the increasingly populated ISM-bands such as 470MHz and 868MHz.

Spread spectrum technology has not always been cost-effective for low cost industrial networking applications such as sensor networks and smart metering.

Semtech says it has developed a radio platform, called LoRa, it spread spectrum radio devices that will increase immunity from sub-GHz LTE signals in industrial networking bands.

The roll out of 4G/LTE mobile networks next to the traditional 868MHz frequency band commonly used in Europe creates increased interference for security systems, smoke detectors, lighting control, home automation and smart meter applications.

The devices deliver over 100dB of blocking immunity to out-of-band interfering signals.

Additionally, the SX127x family has a 25 dB improvement over FSK devices for rejecting in-band interfering signals. This makes the device especially effective in industrial, scientific and medical (ISM)-band applications such as security and metering because it provides immunity from sub-GHz frequency 4G/LTE signals.

The SX127x family achieves a range of more than 15km (9 miles) in a suburban environment and 2 km to 5 km (3 miles) in a dense urban environment while operating under US, EU, Chinese and Japanese regulatory limits.

Most deployed systems for metering, security or industrial automation are limited in range to 1-2 km (less than 1.25 miles) in a suburban environment.

The SX1276 covers all the major sub-GHz frequency bands while the SX1277 is targeted at applications that utilise data rates from 5kbit/s to 40kbit/s such as security systems.

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