Godkända
Konstruktion av effektförstärkare för NB IoT
Rajeshwari Yogi (2015)
Start
2017-01-23
Presentation
2018-06-18
Plats:
Avslutat:
2018-08-31
Examensrapport:
Sammanfattning
1. Introduction The impressive growth and continuous improvement in the IoT and IC technologies promise great business opportunities in this segment. Mistbase AB, Lund is involved in designing wireless solutions for IoT segment and System-on-Chip (SoC) circuits will be designed for the Narrow Band Internet of Things (NB-IoT) standard. As lifetime of 10 years or more has become a necessity in battery operated devices, it makes low power consumption an extremely important requirement for such devices. One of the key components in a radio circuit is the integrated power amplifier (PA). It dominates the power consumptions. Thus in order to improve the power consumption efficiency, efficient power amplifier needs to be designed. The NB-IoT standard supports two different power amplifier classes with +20 dBm and +23 dBm output power respectively. In addition, both single-tone and multi-tone transmission is supported. The major area of focus of the project will be studying the different transmission techniques namely Envelope Elimination and Restoration (EER) and Envelope Tracking (ET) and designing PA for the transmission technique with higher efficiency. The PA will be designed for +20dBm amplifier class and NB-IoT specifications. Schematic will be designed using ST 65 nm technology. 2. Background and Motivation The rapid growth in connected devices promises lucrative business opportunities in the IoT segment. The services leveraging Low Power Wide Area technologies demand deep and wide coverage along with low power consumption and extensive connections. When the capabilities of NB-IoT in this area are compared with other LPWA technologies like e-MTC, SigFox and Lora, NB-IoT offers better performance. The major characteristics of NB-IoT that makes it extremely suitable for LPWA applications include: - No additional infrastructure is required - Improved indoor coverage (+20dB better coverage than GSM) - Longer battery life (approximately 10 years of battery life) - Huge number of connections (50,000 connections per cell) The overall power efficiency of a radio circuit is strongly dependent on the Power Amplifier (PA). The design of power amplifier also depends on the transmission technique to be used. As a result the design and implementation of both these components requires detailed attention and efforts to ensure efficiency and sufficient linearity.
Handledare: Johan Wernehag (EIT)
Examinator: Pietro Andreani (EIT)