A 0.9-GHz fully integrated 45% PAE class-Ε power amplifier fabricated using a 0.18-μm CMOS process for LoRa applications

Tseng, Yu‐Ting; Yang, Jeng-Rern

doi:10.23919/snw.2017.8242325

Cited by 3 publications

(2 citation statements)

References 6 publications

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“…Table summarizes the comparison results between DSBB PA and the existing works which focus on the improvement of switching characteristic . It can be seen that the proposed DSBB PA shows an excellent performance in terms of efficiency.…”

Section: Measurement Resultsmentioning

confidence: 98%

A differential class‐E power amplifier with dynamic body bias technique

Wang

et al. 2019

Micro & Optical Tech Letters

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A fully differential class‐E power amplifier (PA) for wireless body area network applications is presented in this article. A novel dynamic self‐adapting body bias (DSBB) technique is introduced to improve the switch‐on transition and on‐resistance characteristics of MOS transistors. The proposed circuit is fabricated in the TSMC 0.18‐μm RF CMOS process. Measurement results show that the DSBB PA achieves a power‐added efficiency (PAE) of 46.9% with an output power of 13.1 dBm at 900 MHz. Compared to the conventional body‐ground connection PA, PAE and output power are improved more than 6.6% and 4.2 mW, respectively.

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Section: Measurement Resultsmentioning

confidence: 98%

A differential class‐E power amplifier with dynamic body bias technique

Wang

et al. 2019

Micro & Optical Tech Letters

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“…Researchers working on different aspects of energy efficiency such as amplifier design [94], on/off switches to save energy for remote systems [95], tracking systems [96], solar power monitoring systems [97] and running end-devices energy gained through bridge seismographic movements [98]. Spectrum usage, bandwidth and battery usage analysis are evaluated among LPWAN technologies; LoRa, Sigfox, Weightless, LTE-M, NB-IoT [99].…”

Section: Energymentioning

confidence: 99%

A Survey on LoRaWAN Architecture, Protocol and Technologies

et al. 2019

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Internet of Things (IoT) expansion led the market to find alternative communication technologies since existing protocols are insufficient in terms of coverage, energy consumption to fit IoT needs. Low Power Wide Area Networks (LPWAN) emerged as an alternative cost-effective communication technology for the IoT market. LoRaWAN is an open LPWAN standard developed by LoRa Alliance and has key features i.e., low energy consumption, long-range communication, builtin security, GPS-free positioning. In this paper, we will introduce LoRaWAN technology, the state of art studies in the literature and provide open opportunities. Several LPWANs emerged on both licensed and unlicensed bands, LoRaWAN, Sigfox and, NB-IoT are widely deployed vital technologies [3].Sigfox is an ultra-narrow band network that is patented and operated by Sigfox. Sigfox occupies 100 Hz and operates at 433MHz, 868MHz and 915MHz frequencies depending on the geographical regions. Technology has strict constraints on the number of packets (140 per day) and the packet size (12 bytes) to be sent. Also, LoRaWAN has similar policies to prevent network congestion allowing channels to be available only %1 duty-cycle for EU 868MHz (See Section 2.4.7). NB-IoT is an ultra-narrow band technology developed by the 3GPP group which can be adopted on GSM and LTE networks. It occupies 200 MHz bandwidth and can reach up to 200 kbps data transmission speed. Compared to LoRaWAN, Sigfox and NB-IoT operated by global network operators which limit deployments of the private networks [4].An overview comparison of the three networks is shown in Table 1. When LPWAN characteristics are considered LoRaWAN becomes a strong candidate for both scientific and industrial uses cases.LoRa referrer to Long Range and a physical layer technology patented by Semtech [5].LoRaWAN is an open protocol proposed by the LoRa Alliance which enables the MAC layer for the network [6].In this study, we will introduce the technological aspects of LoRaWAN and the state of art studies fulfilled about LoRaWAN till today. LoRaWAN protocol was first released in 2015 and had a few minor revisions, the differences in the protocol has been highlighted in the relevant subsection. In the survey, we will introduce LoRaWAN in depth both technological aspects and the use cases of its different areas. We categorized literature studies as in Figure 1. Studies are classified as two main sections; network technology and the applications, each section has own sub-branches. The majority of the work is focused on the coverage tests and applicability of the technology for different fields from large scale smart city applications to personal tracking assets. However, there are still gaps in the literature where researchers can address these problems such as post-disaster communication, decentralized networks, network management, and Adaptive Data Rate.

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A Sub-1 GHz +24 dBm Linear Two-Stage Power Amplifier with Self-Adaptive Bias Control

Zheng

Wang

et al. 2021

2021 9th International Symposium on Next Generation Electronics (ISNE)

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A 0.9-GHz fully integrated 45% PAE class-Ε power amplifier fabricated using a 0.18-μm CMOS process for LoRa applications

Cited by 3 publications

References 6 publications

A differential class‐E power amplifier with dynamic body bias technique

A differential class‐E power amplifier with dynamic body bias technique

A Survey on LoRaWAN Architecture, Protocol and Technologies

A Sub-1 GHz +24 dBm Linear Two-Stage Power Amplifier with Self-Adaptive Bias Control

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